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Eastern Hemlock

Latin name:
Tsuga canadensis

Extracted from a waterfront pier near Wilmington, Delaware, the tree used to make this portion of the pier
actually came from a forest located in central Pennsylvania. The outermost tree ring dates to the late 1830s.

Giant Sequoia

Latin name:
Sequoiadendron giganteum

A close up of numerous fire scars on a giant sequoia cross section from Sequoia National Park in California, dating back well prior to A.D. 1000. Look closely! Can you find the sad bearded face cradled by his hands, as if he was crying?

Douglas-fir

Latin name:
Pseudotsuga menziesii

This photo shows the tree rings from a beam extracted many years ago from a pueblo in northeastern Arizona. The section shows many false rings and many micro-rings, suggesting this tree may have been growing in a marginal environment.

Ponderosa Pine

Latin name:
Pinus ponderosa

Close up of tree rings of a ponderosa pine collected at El Malpais National Monument in New Mexico, USA, showing tree rings centered around A.D. 1400. Notice the variability in ring widths indicative of sensitivity to year-to-year variation in precipitation.

Douglas-fir

Latin name:
Pseudotsuga menziesii

Perhaps my most requested image of tree rings, obtained from a small Douglas-fir growing in the Zuni Mountains of west-central New Mexico by my colleagues Rex Adams and Chris Baisan. Not very old, but has some of the most beautiful rings of all my displays!

White Oak

Latin name:
Quercus alba

Oak cores from the Hoskins House in Greensboro, North Carolina, site of a famous battle during the Revolutionary War. The house was built from trees cut in 1811 to 1813, not cut and built in the 1780s as the historical agency had hoped.

Ponderosa Pine

Latin name:
Pinus ponderosa

This ponderosa pine once grew at El Morro National Monument in New Mexico, USA, and was cut many years ago. Once you get up close to the stump, you can see a very old scar from a fire many hundreds of years ago that scarred the tree when it only about 12 years old!

Bahamian Pine

Latin name:
Pinus caribaea var. bahamensis

We collected many cross sections of Bahamian pines that had been cut for an industrial park on the island of Abaco, but the rings are very difficult to date! Many false rings, and the pine appears to terminate tree growth during the dry season.

Longleaf Pine

Latin name:
Pinus palustris

This cross section was one of many that came from an old crib dam across a creek that was exposed after a modern dam broke in Hope Mills, North Carolina in 2003. Such sections from old-growth longleaf pines are very rare and provide information on climate back to AD 1500!

White Oak

Latin name:
Quercus alba

Sometimes you don't have to look far to find beauty in wood, and sometimes it may not be a living tree! After an oak tree was cut a year or two before this section was obtained, decay fungi had already set in, beginning to break the wood down to its basic elements.

Southwestern White Pine

Latin name:
Pinus strobiformis

I collected this fire-scarred pine on Mt. Graham in southern Arizona in fall 1991, and it remains one of the best examples of how we can determine the season of fire by looking at the position of the scar within the ring.

Bristlecone Pine

Latin name:
Pinus longaeva

Bristlecone pines have become one of the best proxy records for those who study the history of volcanic eruptions because the cool temperatures caused by these eruptions create "frost rings" that form when the cells implode from the cold.

Eastern Redcedar

Latin name:
Juniperus virginiana

Many well-preserved eastern redcedar sections have been recovered from prehistoric sites in eastern Tennessee, and they have more than enough rings to date, but we don't have a long enough living-tree reference chronology to overlap with them!

Red Oak

Latin name:
Quercus rubra

Oak is by far the most common genus we find in the many historic structures we date using tree rings in the Southeastern U.S. The genus has good ring variability and rarely has problem rings. This section came from a historic tavern in Lexington, Virginia.

Sugar Maple

Latin name:
Acer saccharum

Maple, birch, beech, and basswood are all examples of hardwood species that form diffuse porous wood, meaning that the ring contains many small-diameter vessels all through the ring. Identifying the ring boundary on this wood type is a challenge to tree-ring scientists.

Live Oak

Latin name:
Quercus virginiana

Live oak is an example of an evergreen oak, which is not common within this genus. As such, the wood is semi-ring porous and the rings are very difficult to see and date. Ring growth is also very erratic, not forming the concentric around the tree that we require.

Douglas-fir

Latin name:
Pseudotsuga menziesii

These cores were collected on Mt. Graham in southern Arizona and show a major suppression event beginning in 1685 when missing rings became evident, followed by many micro-rings. This suppression was caused by a major wildfire in 1685!

Ponderosa Pine

Latin name:
Pinus ponderosa

I find it amazing what trees can record in their tree rings! Here we see a cross section of a pine that was damaged by a major flood in the year 1945 in the Chiricahua Mountains of southern Arizona. Notice the reaction wood that formed afterward.

Pignut Hickory

Latin name:
Carya glabra

Sometimes gray-scale imagery helps define tree rings when measuring. Although classified as "ring porous" species, the rather ill-defined tree rings in hickory tree species form large earlywood vessels and smaller latewoood vessels.

Subalpine Fir

Latin name:
Abies lasiocarpa

Decay has set in on the tree rings of this dead and downed subalpine fir that once grew on Apex Mountain in British Columbia, Canada, but the tree rings can still be measured and crossdated despite this!

White Fir

Latin name:
Abies concolor

We found a beautiful fire scar on this white fir that was used to build a cabin in the Valles Caldera of New Mexico. Thought to have been built in the early 1900s, we instead found the cabin was built form white fir and Douglas-fir trees cut in 1941.

Overcup Oak

Latin name:
Quercus lyrata

These oak cores were collected in northeastern Arkansas to investigate a change in the hydrologic regime of a wildlife refuge beginning in the 1990s. We found that trees at this site experienced a major disturbance event in the 1960s.

Western Juniper

Latin name:
Juniperus occidentalis

Near Frederick Butte in central Oregon, we discovered an unusual stand of western junipers that had the most unusual lobate growth forms we had ever seen. This site yielded a drought-sensitive chronology dating back to the AD 800s!

West Indies Pine

Latin name:
Pinus occidentalis

Above 3000 meters on the highest peak in the Carribean, we found an entire forest of these pines, many with fire scars, living on a steep rocky slope. The forest looked more like the dry ponderosa pine forests of the western U.S.

Whitebark Pine

Latin name:
Pinus albicaulis

Whitebark pines growing in the northern Rockies of the western U.S. can grow to be over 1,000 years old, but the species is slowly being decimated by the introduced white pine blister rust. Many of these ancient trees are now dead with ghostly white trunks.

Shagbark Hickory

Latin name:
Carya ovata

Curiously, tree-ring scientists rarely analyze some of the more common hardwood species in the eastern U.S., such as this hickory, perhaps because such forest interior trees may contain a weak climate signal necessary for crossdating.

Virginia Pine

Latin name:
Pinus virginiana

Blue stain found in many sections of dead pines (both in the western and eastern U.S.) is caused by a fungus carried by a pine beetle. The fungus spreads into the phloem and sapwood of living and dead pines, sometimes creating stunning patterns!

Pinyon Pine

Latin name:
Pinus edulis

Burned sections of pinyon pine are commonly found in archaeological sites in the southwestern U.S. These sections can be carefully broken or surfaced with a razor to reveal the ring structure inside to assist in dating the years of construction of the site.

Red Spruce

Latin name:
Picea rubens

Conifers in the highest elevations of the Appalachians of the eastern U.S., such as this red spruce, don't experience wildfires very often, but when fires do occur, they can create numerous fire scars even in this fire-intolerant species. Notice the growth release!

White Spruce

Latin name:
Picea glauca

This tree was located in the Canadian Rockies on the toe slope of an active avalanche path. The scar was created by a debris flow or snow avalanche which struck the tree, killing a section of the living tissue. The avalanche can therefore be dated to its exact year!

Engelmann Spruce

Latin name:
Picea engelmannii

I worked considerably in the spruce-fir forests of southern Arizona in my earliest years in dendrochronology, and learned that trees with limited sensitivity can provide a vast amount of information on the history of these forests.

Ponderosa Pine

Latin name:
Pinus ponderosa

The lava flows of El Malpais National Monument in New Mexico contain vast amounts of remnant wood, mostly ponderosa pines such as this sample, and the tree rings on these samples go back nearly 2000 years! Notice the year AD 1400 on this section.

Chestnut Oak

Latin name:
Quercus montana

In the southeastern U.S., hardwood species are often scarred by wildfire. Most often, this also will cause considerable decay in the sample, but this oak had several well preserved fire scars, suggesting fire was common in these drier, lower elevation sites.

Ponderosa Pine

Latin name:
Pinus ponderosa

I originally sampled this stump in 1991 for its fire scars, located in El Malpais National Monument of New Mexico. I found it again 20 years later and was happy you could still see the tree rings and fire scars clearly! It had originally been logged in the 1930s!

Lodgepole Pine

Latin name:
Pinus contorta

This pine is found at higher elevations in the Rocky Mountains of the western U.S. At this site in Montana, we had thought we found fire scars on these pines, but it turns out that these are scars caused by bark beetles stripping away portions of the bark.

Douglas-fir

Latin name:
Pseudotsuga menziesii

These cores illustrate the level of sensitivity to climate fluctuations in Douglas-fir trees growing in El Malpais National Monument in New Mexico. These rings show the common pattern of narrow marker rings between 1800 (on the left) and 1860 (on the right).

Douglas-fir

Latin name:
Pseudotsuga menziesii

This photo shows a close-up of the rings in the previous image. The very wide tree ring is the year 1816, the "Year Without a Summer." Cooler temperatures meant more soil water for the malpais Douglas-firs, causing a wide ring for that year!

Ponderosa Pine

Latin name:
Pinus ponderosa

Dating fire scars found in the annual rings is a major application of tree-ring dating. This photo shows two scars. Notice the wider rings that formed after the upper scar, perhaps caused by removal of competing vegetation or added nutrients.

Longleaf Pine

Latin name:
Pinus palustris

Longleaf pines have the greatest ages of all the eastern pines. They grow slowly in sandy soils of the Atlantic Coastal Plain, and have proven ideal for learning about past climate and disturbance events, if old-growth stands can be located!

Rocky Mountain Juniper

Latin name:
Juniperus scopulorum

The juniper species of the western U.S. have proven a challenge in tree-ring dating, but Rocky Mountain juniper has tree rings that are easily identified and can be crossdated. Just watch out for false rings and expanded latewood!

Douglas-fir

Latin name:
Pseudotsuga menziesii

A close-up photo of tree rings in Douglas-fir reveals the individual wood cells that make up the xylem. These are called "tracheids." Notice the change in cell wall thickness from the earlywood cells to the latewood cells along a radial file of cells.

Douglas-fir

Latin name:
Pseudotsuga menziesii

The best trees for learning about past climate will be those that grow to great ages and are particularly sensitive to year to year changes in climate. This Douglas-fir began growing around the year 200 BC and lived for nearly 1000 years!

Mesquite

Latin name:
Prosopis glandulosa

Some desert species from the mid-latitudes do form annual rings, but these diffuse-porous species have rings that are difficult to see. You can use black marker and white chalk dust to help bring out the rings! The dust fills the small vessels and the rings appear!

Norway Spruce

Latin name:
Picea abies

Spruce is the preferred genus for making high-quality wooden bodies on musical instruments. This photo shows the tree rings on the outer edge of the "Messiah" violin. Analysis of its tree rings helped show that the violin was contemporary with Stradivari!

Black Locust

Latin name:
Robinia pseudoacacia

In the eastern U.S., this common hardwood species has beautiful tree rings that demonstrate the ring porous wood type. The tree species, however, has some of the densest wood found in North America and is extremely difficult to core!

White Oak

Latin name:
Quercus alba

Oak is a major genus used to build log structures in the eastern U.S. Sometimes, however, we find that the individual trees experienced some major disturbances that caused very aberrant rings, making crossdating all but impossible.

Palo Verde

Latin name:
Parkinsonia florida

A common tree species in the American Southwest, palo verde is a diffuse porous species that forms very indistinct tree rings. As a result, little tree-ring research has been performed on this genus. Best to use complete cross sections, when available.

Ponderosa Pine

Latin name:
Pinus ponderosa

A major application of tree-ring research is learning about insect populations. For example, pandora moth defoliated the needles on this tree, causing some narrow rings to be produced. We can use this pattern to learn about insect populations over many centuries!

Table Mountain Pine

Latin name:
Pinus pungens

The analysis of fire scars in tree rings can also be applied to pine species growing in the eastern U.S. Table Mountain pine has proven to be the best species in the Appalachian Mountains for learning about past wildfires!

Subalpine Fir

Latin name:
Abies lasiocarpa

Subalpine fir grows in the highest elevations of the southern Rocky Mountains and forms fairly compacent ring series. Sometime between 1979 and 1980, this tree was stripped almost completely of its bark by a black bear, but it still survived in one small area!

Florida Torreya

Latin name:
Torreya taxifolia

Perhaps the rarest conifer in the U.S., this species is on the brink of extinction because its habitat is facing mounting pressure from rapid changes in its native environment. It forms very nice tree rings, but few adult individuals are left to analyze.

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get in touch

Laboratories and People  

Numerous other tree-ring sites around the world have set up their own Home Pages on the World Wide Web. You can browse to see other projects that are currently being conducted by the various institutions. Do you need to find a tree-ring laboratory nearby to your home town? This is the place to look - I think you'll be surprised to see the numerous laboratories around the world that practice tree-ring research. If you or any of your colleagues know of an institution that should be added to this page, by all means contact me at the e-mail address at the bottom of this page. If you establish your own web site, please let me know so I can add your address to this page.

Major laboratories at academic institutions (arranged alphabetically by institution name)
Major laboratories at other institutions (arranged alphabetically by laboratory name)
Personal home pages for individuals (arranged alphabetically by last name)

Be sure to check out this Google Map of tree-ring laboratories located in the United States created by Dr. Chris Gentry of Austin Peay State University! Go Peay!

Tree-ring labs in the U.S.


Major Laboratories at Academic Institutions

 

University of Alabama
Forest Dynamics Lab

Directed by Dr. Justin Hart, the lab focuses on forest community and ecosystem ecology and plant geography. Major emphasis is placed on the elucidation of forest development and successional patterns. Much of our work examines the influence of disturbance events, land-use history, and physical environmental conditions (such as climate) on forests at the community and ecosystem levels. Links are provided to personnel in laboratory, research projects underway, publications, coursework offered, and photos.

 

Appalachian State University
Appalachian Tree Ring Lab

Located in Boone, North Carolina, this newly created lab is directed by Dr. Saskia van de Gevel and Dr. Pete Soule of the Department of Geography and Planning. Current projects are being conducted in Montana, North Carolina, and Tennessee, and the lab welcomes inquiries from interested undergraduates and potential graduate students. Their research focuses on annual resolution information about climate, disturbance regimes, and cultural history. Projects in their laboratory have been funded by the National Science Foundation, The Nature Conservancy, Grandfather Mountain, and others.

 

University of Arizona
Laboratory of Tree-Ring Research

Located at The University of Arizona in Tucson, Arizona, the LTRR was the first laboratory of its kind anywhere in the world, first established in 1937 by the father of dendrochronology, A.E. Douglass. Today, it serves as one of the premier tree-ring research facilities with nearly 90 personnel investigating nearly all topics in dendrochronology. Their Web Home Page states, "Current research efforts are directed toward the quantification of tree-ring parameters, the establishment of new tree-ring chronologies throughout the world, the use of tree rings in the study of forest ecosystems, the reconstruction of paleohydrologic and paleoclimatic variables, and the documentation and development of prehistoric chronological controls."

LUHNA Project - Southwestern United States

LUHNA (Land Use History of North America) is an ambitious project in which the Laboratory of Tree-Ring Research (with Dr. Thomas W. Swetnam) is involved. The goal of LUHNA is to document the history of land use in various sectors of the United States to provide "clues from the past about our future environment." Dendroecological analyses will play a major role in this project, especially for characterizing changes in the landscape due to wildfires.

News stories about the LTRR:

Two UA Environment Experts Named Regents' Professors
Climate, Mediterranean cultures, change
Giant sequoia slice planted at new home in tree-ring lab
How The Smokey Bear Effect Led To Raging Wildfires

The life and times of a dendrochronologist: The story is in the tree rings
Ancient tree-ring records from southwest U.S. suggest today's megafires are truly unusual
Tree Rings Tell Ancient Tales
University of Arizona professor discusses historic precipitation data obtained from tree rings
20th Century One of Driest in Nine Centuries for Northwest Africa
Growth Spurt in Tree Rings Prompts Questions About Climate Change
Marvin Stokes, Botanist Who Harvested Navajo History From Trees, Dies at 82
Tree-Ring Curator Works to Manage Massive Research Collection

 

The University of Arkansas
Tree-Ring Laboratory

This university has had a long and storied tradition in dendrochronology, headed by Drs. David W. Stahle and Malcolm K. Cleaveland in the Department of Geography. Recently, a Ph.D. program in Environmental Science was announced that could well involve tree-ring research. This link also provides information on the "Ancient Cross Timbers Project" initiated by this lab, "dedicated to the location and appreciation of these authentic ancient forest remnants." A wonderfully illustrated and informative site.

News stories about the Tree-Ring Laboratory:

Climatology: Lessons from the Past and the Reality of Global Warming
Megadeath in Mexico
Researchers find evidence of 16th century epic drought over North America
Extreme droughts played major role in tragedies at Jamestown, "Lost Colony" 

 

Austin Peay State University
Biogeography, Environment, and Tree-Ring Laboratory (BETR)

This is a newly established research unit as of November 2009 within the Department of Geosciences at Austin Peay State University, Tennessee, U.S.A. Faculty and students in the B.E.T.R. Lab perform research in the fields of biogeography, dendrochronology, geospatial analysis, and environmental studies. Created by Dr. Christopher Gentry, this lab's web site provides information on research projects, personnel, news items about the lab, a fantastic photo gallery, and links to other sites. This lab is also one of the very few conducting research in urban forestry!

 

Universität Bern
Laboratory of Dendrogeomorphology

Located in scenic western Switzerland, this laboratory specializes in the use of tree-ring data to learn about past land-surface processes, such as rock fall, activity, debris flows, erosion rates, and snow avalanches. Dr. Markus Stoffel is the laboratory coordinator of this impressive lab, which includes many advanced graduate and undergraduate students. At this site, you can learn about their projects and publications, and even access a very nice photo gallery.

 

Carleton University
Palaeoecological Laboratory

Headed by Dr. Michael Pisaric, this laboratory focuses on a variety of palaeoecological techniques to learn about the past environment, including both lake sediment analysis (fossil pollen, stomata and charcoal) and dendrochronology. Current projects are being conducted in the Yukon Territory, northern British Columbia, Northwest Territories and eastern Ontario. On their web site, you'll find information about their facilities, projects, personnel, publications, and important links. They're also interested in recruiting graduate students!

 

Chinese Academy of Sciences, Institute of Botany
Tree-Ring Laboratory


Located in the Center of Plant Ecology at the Institute of Botany, Chinese Academy of Sciences, in Beijing, China, this laboratory is directed by Dr. Qi-bin Zhang, who has a host of talented technicians and students working and learning in this impressive laboratory. The web site contains information about current projects, lab personnel, facilities, publications, and a photo gallery, and the laboratory also encourages collaboration with other institutes. The Institute of Botany and the Tree-Ring Laboratory hosted the Seventh International Conference on Dendrochronology in the summer of 2006.

 

Institute of Prehistoric Archaeology at the University of Cologne
Laboratory of Dendroarchaeology

Dr. Thomas Frank is the head of this laboratory since 2008, which has a long history of conducting tree-ring research in Europe under the leadership of Dr. Burghart Schmidt from 1972 to 2008. The web pages for this laboratory (in German, English texts in preparation) provide general information on tree-ring dating, the development of a continuous tree-ring chronology back to 7237 BC, the many projects being conducted by this laboratory (even arranged by period), the numerous publications of this laboratory (including mostly books and edited volumes but also downloadable PDF-files), information on contact and services, a growing picture gallery and a page of links.

 

Columbia University
Lamont-Doherty Earth Observatory Tree-Ring Laboratory

Founded in 1975 by Dr. Gordon Jacoby and Dr. Edward R. Cook, this laboratory is one of the most active in the tree-ring sciences, publishing some of the most influential articles in dendrochronology (see under "Classic References"). Their scientists "...have been involved in a variety of research applications in tree-ring analysis, including dendroclimatology, paleoseismology, forestry, resource management, volcanology and archaeology." Their Home Page provides information about personnel, research interests, research sponsors, and facilities.

News stories about the LDEO Tree-Ring Laboratory:

Bidding Farewell to the Jewel of the Lotus
Tree ring study shows the southeast USA drought was mild compared to past events
Trees Tell the Story of 500 Years of NYC Drought History
Timelines In Timber: Inside A Tree-Ring Laboratory
Tree Rings Tell Epic Tale of Asian Droughts
Tree rings map 700 years of Asian monsoons
Tree-Ring Laboratory receives $5.5 million to study climate dynamics
A New Twist on Tree Rings
Tree rings reveal 'mega-droughts'

Tree rings show earth was warm 800 years ago
Mongolian Tree Rings Confirm Global Warming Findings

Tree Rings Show Rising Earth Temperatures

 

Cornell University
The Malcolm and Carolyn Wiener Laboratory for Aegean and Near Eastern Dendrochronology

Headed and directed by Prof. Sturt Manning of the Department of the History of Art and Archaeology at Cornell University, this project has as its goal "...to build a single master tree-ring chronology for the Aegean and Near East that will extend from the present to the seventh millennium B.C. or whenever timbers began to be used in quantity as construction material in settled communities." These informative Web pages also provide links to the many reports published by this highly productive laboratory.

News stories about the laboratory:

How old trees and ancient wood are helping rewrite history
X-rays Track Tree-Ring Growth Anomalies
Can ancient tree rings help us understand climate change?
Scientists Use Tree Rings to Date 3,000-Year-Old Volcanic Eruption
Scientists hope tree rings will tell Mediterranean's age
Cornell Researchers Precisely Date Wood From Ancient Tomb In Turkey

 

University of East Anglia
Climatic Research Unit

The Climatic Research Unit is located in Norwich, England. Researchers here, such as Dr. Keith R. Briffa and Dr. Phil Jones, have conducted some of the most influential tree-ring research yet published, concentrating especially on long-term (> 2,000 years) climate reconstructions for northern Eurasia. This link is well worth a look.

 

Eastern Kentucky University
Cumberland Laboratory of Forest Science

Led by Dr. Neil Pederson, this laboratory conducts tree-ring research throughout the Southeastern U.S. Projects include research on drought history in Kentucky, the dendroecology of non-leucobalanus trees, and carbon sequestration in Great Smoky Mountains National Park. These pages introduce you to the students involved with these projects, the publications of the laboratory, and Kentucky's old-growth forests. Neil also maintains the Eastern Oldlist, the database that contains the maximum ages so far yet discovered for many eastern tree species.

 

Eidgenössiche Technische Hochschule Zürich
Swiss Federal Institute of Technology Zürich
Tree-Ring Laboratory

A component of the Chair of Forest Ecology at ETH Zürich, headed by Prof. Dr. Harald Bugmann, this laboratory is directed by Dr. Christof Bigler. Their research focuses on dendroecological studies by using "tree rings to study forest dynamics such as regeneration, growth and mortality processes, and we investigate the effects of climate and natural disturbances on trees, forests and landscapes." The research conducted in this lab concentrates on mountain environments.

 

University of Forestry, Bulgaria
Dendrochronology Laboratory

This new laboratory in Bulgaria actually has been publishing in tree-ring science for a number of years now. Led by  Dr. Stefan Mirtchev, Dr. Ilia Vakarelov, and Dr. Momchil Panayotov, this laboratory engages in such diverse research as stressors in Pinus sylvestris plantations, limiting factors at treeline afforestations, and avalanches along the Northwestern slope of Todorka Peak, Pirin mountains. These pages contain links to lab members, publications, research projects, and photo galleries.

 

Albert-Ludwigs-Universität Freiburg
Institut für Waldwachstum
Institute for Forest Growth

The Institute for Forest Growth (IWW) is located in Freiburg i. Br., Germany. Staff of the IWW study the growth of forest trees in their environment and develop decision tools for controlling forest growth. The web pages are bilingual, and provide information about the main topics of research, the teaching courses and educational program, listing of its staff, events, recent publications, as well as facilities and services of the institute.

 

University of Göttingen
International Tree-Ring Laboratory:
Tree-Ring Research in Temperate, Tropical and Subtropical Regions

Dr. Martin Worbes is perhaps the world's leading expert on the dendrochronology of tropical and subtropical tree species, and has created a set of web pages that describes his laboratory. Here, you'll find links to current science and research projects, the dendroecological fieldweeks operated by the Forstbotanisches Institut, collaborative projects, and a publications list.

 

University Griefswald
DendroGrief

The dendroecological laboratory DendroGreif was established in 2005 at the University of Greifswald, Germany, with the goal to use dendrochronology and dendroecology to improve the understanding of ecological processes at scales ranging from the individual plant to the landscape. Their major research foci are shrubs and trees in arctic, boreal, and alpine environments and forests in central Europe. They apply anatomical analyses of wood cell features and new equipment, e.g. an ITRAX Multiscanner for density coupled with XRF Element analysis for dendrochemistry.

 

University of Guelph
Climate & Ecosystem Dynamics Research Lab (CEDaR)


Led by Dr. Ze'ev Gedalof, this laboratory conducts research on a diverse range of problems relating to climatic variability and forest ecology. Most of their research involves the analysis of tree rings in order to understand past patterns of climatic variability, stand dynamics, and disturbance regimes. The Lab is is equipped with state-of-the-art facilities for the analysis of ecological and dendrochronological data.

 

University of Hamburg
Institute for Wood Biology and Wood Protection

Located at the University of Hamburg, Germany, the purpose of this research center is to develop "...a purpose-orientated forestry and an efficient wood-processing technology." Their Home Page provides links to their various institutions, including one to the Institute for Wood Biology and Wood Protection, headed by the eminent dendrochronologist, Prof. Dr. Dieter Eckstein.

 

University of Idaho
PaleoEcology and Fire Ecology Lab

Directed by Dr. Philip Higuera, this laboratory is part of the College of Natural Resources and "focuses on understanding the interactions among climate, vegetation, and fire regimes over a range of spatial and temporal scales, in the past, present, and future." Lab members work at sites in Alaska, Canada, the Rocky Mountains, and Australia, analyzing lake sediments, tree-ring records, and historical records to learn about past environments.

 

University of Helsinki
Department of Geology

This university has a long history of conducting quality tree-ring research, especially using subfossil Scots pine mega-fossil samples that abound in Finland. Professor Matti Eronen along with post-doctoral fellow Samuli Helama have been been very proficient publishing many articles in recent years. At their web site, you can read about their graduate students, the current research of the department, and access a list of their recent publications.

 

Indiana State University
Biogeography and Dendrochronology Laboratory

Dr. Jim Speer is well-known to all of us and he's been at Indiana State University for several years now. In this time, he's developed a world-class laboratory devoted to Biogeography and the use of Dendrochronology to answer questions about the environment. Current projects include effects of cicadas on tree growth, effects of recent climate change in central Indiana, and climate response in regional tree species. This site provides information on past presentations, graduate students and personnel, publications, and links to valuable sites.

 

University of Innsbruck
Dendroecology and Tree Physiology

This laboratory focuses on impact of past and present climate conditions on tree growth at boundaries of tree existence in the Alps, especially at the Alpine timberline and within dry inner Alpine environments. They analyse radial growth increments (tree rings) at the inter-annual and intra-annual scale together with tree physiological parameters to better understand the ecological relationships between tree growth, climate and site conditions. Because there is a lack of knowledge in the physiological basis of climate-growth relationships, the influence of climatic variables and site conditions on cambial activity and dynamics of wood formation is a major concern.

 

Universität Innsbruck
Alpine Tree-Ring Group

Led by Dr. Kurt Nicolussi of the Institute of Geography, this group is well-known for their research in alpine areas of Europe, developing extremely long tree-ring chronologies for the late Holocene. They conduct research on treeline dynamics, climate reconstruction, and dendroarchaeology, heavily relying on subfossil wood. Special emphasis is given on the analysis and reconstruction of the environmental and climatic evolution of high-mountain regions of the Alps during the Holocene. Links on this web site gives details on their publications, group members, and research projects.

 

University of Joensuu
Laboratory of Dendrochronology

Directed by Pentti Zetterberg, the studies in this laboratory (established 1985) concern mainly Scots pine (Pinus sylvestris L.) but also common (or Norway) spruce (Picea abies (L.) H. Karst.) and pedunculate oak (Quercus robur L.) in Finland and adjacent areas in northern Norway and Russian Karelia. The many research topics of this laboratory are quite impressive (and you can read about these through the lab's searchable list of research topics), from dating of shipwrecks and underwater wooden structures, to the dating of medieval castles, to the development of 7589-year subfossil pine tree-ring chronology for Finnish Lapland.

 

University of Joensuu
SAIMA Unit of the Savonlinna Department of Teacher Education

This famous center for research is administered by the University of Joensuu, Karelian Research Institute, Section of Ecology. Markus Lindholm, Jouko Meriläinen, Petteri Vanninen, and 2-4 technicians conduct research in various aspects of dendroecology, and you can access their extensive list of publications that gives details on their accomplishments. The link that shows pictures is well worth exploring as these photographs show how these researchers pluck subfossil pine trees from the depths of high-latitude lakes to build very long tree-ring chronologies.

 

Université Joseph Fourier
Centre d'Ecologie Alpine

This laboratory has been one of the most productive dendroecological research teams in recent years. Created and assembled by Dr. Christian Rolland, this web site provides a large amount of information on their investigators (including Véronique Petitcolas, Carole Desplanque, Richard Michalet, and Jeanne Florence Schueller), their publications, the tree species they've analyzed, and the sites they've examined. They also have macrophotographs available of the species they've investigated.

 

Université Laval
Centre d'études nordiques

Located in Sainte-Foy, Québec, the CEN is a multifaceted center for the study of natural history. Concentrating on arctic and subarctic environments, the center is home to several top dendrochronologists, such as Louise Filion, Serge Payette, and Yves Bégin. Their research has covered practically all topics in dendrochronology, including climate reconstructions and interpretations, dendrogeomorphology, palaeoecology, and dendroecology.

 

University of Ljubljana
Laboratory of Wood Anatomy and Dendrochronology

Directed under the Chair of Wood Science (Head, Dr. Katarina Cufar), this laboratory has been conducting significant tree-ring research since 1993. The laboratory conducts investigations and teaching in the fields of wood anatomy, dendrochronology, biological, physical and mechanical properties of wood, and wood drying. The goal of this laboratory "is to develop dated tree ring chronologies of the most important species in the region and to develop different aspects of dendrochronological research in cooperation with different research fields like archaeology, restoration, history, ethnology, and ecology." The pictures and explanations on dendrochronology found on this site are some of the best I've ever seen.

 

Lund University
Laboratory of Wood Anatomy and Dendrochronology

Located at Lund University in Sweden, the primary focus of research at this laboratory "...is devoted to dendrochronology - constructing reference chronologies on oak, pine and spruce for different regions of Sweden." The chronologies are later used for absolute dating of timber from archaeological excavations (settlements, etc.) and standing structures (houses, etc.). Their Home Page provides information about research personnel, research projects, and recent publications.

 

University of Minnesota
Center for Dendrochronology

The Center for Dendrochronology is based in the Department of Geography at the University of Minnesota. Led by faculty members Dr. Kurt Kipfmueller and Dr. Scott St. George, the Center has faculty and students conducting research in a variety of environments and on a number of topics, including disturbance ecology, fire climatology, water resources and natural hazards.

News stories about the laboratory:

U student's flood data project gets national attention

 

University of Missouri-Columbia
Tree-Ring Laboratory

Perhaps one of the most artistic web sites in dendrochronology, the Missouri Tree-Ring Laboratory web site is masterfully organized and a pleasure to browse. Links are supplied to learn about the facilities, the faculty and staff (including the effervescent Dr. Richard Guyette), current projects (and there are many), and recent publications. This laboratory is involved in everything from fire history to dendroarchaeology!

News stories about the laboratory:

Tree rings hold the key to Hickam House's age

 

University of Montreal
Groupe de Recherche en Dendrochronologie Historique

The Research Group in Historical Dendrochronology (GRDH) is an official non-profit organization that began operation in January 2002. The organization is based at the Department of Anthropology of the University of Montreal, and brings together researchers who wish to advance the field of historical dendrochronology (dendroarchaeology) and the dating of historic and prehistoric sites in Quebec. The web pages, all in French, provide background information on archaeological dendrochronology, current projects, and services offered.

 

Mount Allison University
MAD Laboratory

Launched in Fall 2003, this laboratory is led by Colin Laroque who, along with his impressive crew, has put together a very entertaining and informative web site. For those of you (like me) who have no clue where Mount Allison University is, it's located in Sackville, New Brunswick, Canada. "The first priority of the MAD Lab is to establish extensive tree-ring chronologies in the region.  These chronologies will form the foundation of various projects, from researching annually-resolved proxy climatic records for the Atlantic region, to dating historic structures in Maritime Canada."

 

News stories about the laboratory:

  Mount Allison solves Titanic mystery for PBS - Arts & Entertainment

 

University of Nevada, Reno
Tree-Ring Laboratory


Dr. Franco Biondi heads this laboratory, along with Scotty Strachan, Kishor Waikul, and Peter Hartsough. This site contains information on the lab's current projects, the lab's emphasis on GIS, pictures of the lab facilities, and links to downloadable forms for skeleton plotting. Of particular interest is the lab's programming expertise, which has resulted already in significant new software for analyzing the climate/tree growth relationship.

 

University of North Carolina-Chapel Hill
Climate & Tree Ring Environmental Science Lab

The C-TRĒS research group, led by Dr. Erika Wise, uses dendrochronology to answer questions concerning pre-instrumental synoptic climatology, ocean-atmosphere oscillations, and water resources.  The geographical focus thus far has been on western North America, especially the Pacific Northwest and the Intermountain West. The lab facilities, renovated in 2014, include a custom-built measuring table, separate wood preparation and storage areas, standing work benches, and student research carrels.

 

University of North Carolina-Greensboro
Carolina Tree-Ring Science Laboratory

This laboratory was established by long-time tree-ring researcher Dr. Paul Knapp, who has published some important articles that concern tree-ring dating of western junipers and ponderosa pines all over the western U.S. with colleague Pete Soule from Appalachian State University. Begun in 2006, this lab has all the amenities: wood preparation, measurement, and crossdating. Paul states: "My observations over the past decade have led me to believe that tree-ring science is a great sub-discipline for physical geographers, with extensive, relevant, and timely applications that are often interdisciplinary."

 

University of Nottingham
Nottingham Tree-Ring Dating Laboratory

Nottingham Tree-Ring Dating Lab
Robert Howard and Alison Arnold lead this laboratory which has been one of the most prolific laboratories in all of Europe for dating historic structures over the past 30 years. Their web site gives a history of the laboratory, an introduction to tree-ring dating (especially for standing buildings), links to the many sites that this laboratory has dated, and they provide a bibliography of published books, academic papers, and general articles.
 

Pennsylvania State University
Vegetation Dynamics Laboratory

Part of the Department of Geography, this laboratory was initiated by Dr. Alan H. Taylor, who has conducted considerable tree-ring research on fire history and vegetation change. This site provides information on their research projects (fire history, climate reconstructions, vegetation change, and archaeology), internship possibilities, and also a virtual tour of the laboratory.

 

Université du Québec
Laboratoire de Dendroécologie

Located at the Lake Duparquet Research and Teaching Forest and directed by Igor Drobyshev, this educational and research laboratory teaches dendrochronology and dendroecology to students and researchers at the Université du Québec en Abitibi-Témiscamingue and the Université du Québec à Montréal. Links are provided showing recent upcoming events, ongoing collaborative projects, equipment available at the laboratory, links to other sites, and a special link to the First Dendroweek FERLD.

 

University of Regina
Tree-Ring Laboratory


Established in 1998, this multidimensional laboratory has its processing and measuring facility located in the Department of Geography while the researchers and data processing lab are based at the Prairie Adaptation Research Collaborative (PARC), a climate change research center. Personnel have focused on developing a network of 60 tree-ring chronologies encompassing the island forests of eastern Montana, and the foothills and boreal forests of Alberta, Saskatchewan and the Northwest Territories. Their web site provides information on theses, personnel (past and current), projects, presentations, and sites sampled.

 

University of Southern Mississippi
Dendron Lab

Directed by Dr. Grant Harley of the Department of Geography and Geology, this lab focuses on Quaternary landscape dynamics and paleoenvironmental reconstruction. They use a variety of research methods, tools, and techniques to investigate the spatiotemporal variability of landscape-scale vegetation dynamics. This smartly-designed web site features the personnel of the lab (including graduate students), research projects underway, laboratory news, and lists of equipment.

 

University of St. Andrews
Tree-Ring Laboratory


Dr. Rob Wilson of the School of Geography & Geosciences now has a formal laboratory where the "research foci are varied - from reconstructing past climate, dating historical structures and undertaking ecological analysis. Although tree rings are our proxy focus, research is also undertaken using historical, mollusc and coral archives." At this site, you'll find links to the lab's staff and students, information on undergraduate projects, links to collaborating individuals, and an extensive publications list (with PDF links).

 

Swedish Agricultural University Alnarp
Dendrochronological Laboratory

The laboratory here was set up in 1997, and consists of the two well-known dendroecologists Igor Drobyshev and Matts Niklasson. The lab works mainly in southern Scandinavia and central-eastern Europe, and focuses on dendrochronology, dendroecology, forest ecology, forest history, and past climate variability, with links to biodiversity and conservation. This site provides information on master projects, research programs, publications, news, links, staff and contact information, and the First Dendroweek FERLD.

 

Swiss Federal Institute, Birmensdorf
The Swiss Federal Institute for Forest, Snow and Landscape Research (WSL)

The WSL, located in Birmensdorf, Switzerland, is home to many dendrochronologists, including Drs. Fritz H. Schweingruber, Otto Bräker, Paolo Cherubini, Klaus Felix Kaiser, and many others. These web pages are multilingual, and provide information about the main topics of research, a full listing of its staff, recent publications, and even a separate page for radiodensitometry! These pages are a wealth of information concerning dendrochronology, all at your finger tips.

News stories about the WSL:

Drought affects Mediterranean truffle harvest
Climate in northern Europe reconstructed for the past 2,000 years: Cooling trend calculated precisely

 

The University of Tennessee
Laboratory of Tree-Ring Science


This laboratory has been conducting research in dendrochronology for nearly 15 years. Directed by Dr. Henri D. Grissino-Mayer, the lab consists of an Associate Director (Dr. Sally Horn), six graduate students (currently as of 2014), and several undergraduates. From time to time, we host visitors form other departments as well as international scholars. The web site contains detailed information on their current and completed projects, the lab's facilities, and its impressive amount of equipment. The lab specializes in conducting research in fire history, climate reconstructions, and archaeological investigations.

Past and Current Projects
Personnel of the LTRS

Equipment of the LTRS
Teaching Dendro at the LTRS
Facilities of the LTRS
Awards for the LTRS

News stories about the LTRS:

Preservation of historic Sabine Hill continues -- WJHL, Johnson City, Tennessee
Without fire, No Name Key could lose its pine forests -- Keynews.com
1,000 Year Old Tree Rings Predict Possible Worse Drought to Come -- Agfax.com
Dendroarchaeology Expert to Talk Tree-Ring Dating and Historic Structures -- University of Wisconsin-Platteville, University News
The Longest Measure of Drought: 21 Centuries of Rainfall in New Mexico -- NYTimes.com
Timbers from Dam Hold Record of Past -- Fredericksburg Free-Lance Star
Fire and Climate Research in the Smokies -- National Park Service
UF, UT Researchers Join Forces to Bring Tree-Ring Dating Technology to Heart of Southeast -- University of Florida News
Renowned Expert Grissino-Mayer to Participate in B3C Tree Symposium -- The Beaufort Gazette
Dr. Grissino-Mayer to Speak -- Historic City News
Choking on Air -- Tennessee Journalist
UT Pre-Game Faculty Showcase Focuses on Tree Ring Science, Wildfire Predictions in Smokies
UT researchers' work reveals 220-year hurricane history -- Tennessee Today
Tree rings provide a 200-year-old hurricane record -- NSF News
Tree rings could settle global warming hurricane debate -- MongaBay.com
Every tree has a story to tell -- Christian Science Monitor
Did "Little Ice Age" Create Stradivarius Violins' Famous Tone? -- National Geographic News
Burning to survive -- Knoxville News-Sentinel
Does climate explain prized violins' tone? -- MSNBC
£10m violin 'the real thing' -- BBC News
Secret ingredient in Stradivari may be heaven sent -- USA Today
Chill might be Stradivarius secret -- London Free Press

 

The University of Victoria
Tree-Ring Laboratory

Headed by Dr. Dan Smith in the Department of Geography at the University of Victoria in British Columbia, Canada, researchers at this laboratory have investigated the past climate of the Canadian Rockies during the last 1,000 years, especially the impact of the Little Ice Age (LIA). Other projects include the dendrochronological dating of LIA glacier advances, and the investigation of snow avalanche impacts.

 

Vytautas Magnus University
Group of Dendroclimatology and Radiometrics

This web site will inform you of a laboratory that has a long tradition in dendrochronology. Many of us know about the famous Teodoras Bitvinskas -- this research group continues his legacy in Kaunas, Lithuania. The group consists of Rutile Pukiene, Adomas Vitas, Jonas Karpavicius, Algimantas Daukantas, Emilija Podžarova, and Elvyra Šimkūnienė. These web pages describe their current projects, their history, and their activities. Pages are also provided with important links and for contact information.

 

Wageningen University
Dendrolab FEM

Established in 2005 by Dr. Ute Sass-Klaassen the Forest Ecology and Forest Management Group, the lab focuses on Dendrochronology and Quantitative Wood Anatomy, touching everything from Dendroclimatology, Tropical Dendrochronology, Dating and Dendroprovenancing, Wood Science, and Dendrobiology. Available are links to publications by year, information on facilities for sample preparation and measuring, personnel, recent news items, and information on their educational outreach.

 

West Virginia University
Montane Forest Dynamics Lab

Directed by Dr. Amy Hessl, this lab specializes on the "on the interaction between ecosystem processes, climate variability and human activities in forested systems." Particularly interesting is the research by Dr. Hessl and her colleagues on the climate dynamics during the time of the Mongul Empire using ancient trees and remnant wood found on lava flows in Mongolia. The web site provides information on lab personnel, publications, research projects, and relevant courses taught by Dr. Hessl.

 

The University of Western Ontario
Dendrogeomorphology Laboratory

Headed by Dr. Brian Luckman, the dendrogeomorphology laboratory has been one of the most active and productive laboratories of its kind anywhere in the world. These pages provide a brief history of this facility, a summary of the current research bring conducted, and  information on their facilities and graduate students. A photo gallery adds a personal touch to this laboratory and highlights the many locations where they are conducting their research.

 
News stories about the laboratory:

 Unusual tree growth patterns in the Southern Hemisphere linked to climate change

 

University of Wisconsin–Parkside
Biogeography and Dendrochronology Lab

This lab was developed in 2000 by Dr. Joy Wolf. She and her students use dendrochronology to study fire, climate variability and population dynamics on Midwestern oak savanna and conifer stands. Together, they designed a unique method in measuring rings in extremely large specimens. Her lab includes state-of-the-art equipment to conduct dendrochronological analysis.

 

College of Wooster
Tree Ring Laboratory

Directed by Greg Wiles, this laboratory focuses primarily on tree-ring research in Alaska (climate change and dendroglaciology) and Ohio (climate studies and dating historical structures). This lab also specializes in student-based research, with many senior projects highlighted. The lab's web site has links to current projects, facilities, a photo gallery, personnel, and publications.

 

Universidad Zaragoza
Dendroteam

The Dendroteam research group consists of professors and researchers from the Department of Geography and Regional Planning at the University of Zaragoza, Department of Ecology, University of Alicante, and the Biotechnical Faculty of the University of Ljubljana. The research is focused on the analysis of spatial and temporal patterns of growth forests in relation to climate.

 


Major Laboratories at Other Institutions

 

English Heritage - Centre for Archaeology

This laboratory is a part of the English Heritage's Archaeology Division, and has funded numerous archaeological tree-ring projects aimed at elucidating the construction history of structures such as farmhouses, manors, and churches. A very informative link.

 

Institute of Archaeology, University College London

Dr. Martin Bridge has been conducting tree-ring research in Great Britain since 1979, and is currently involved in the dating of many structures throughout the English countryside. These web pages provide some information on how the dating is done on these structures, a list of his publications, and information on the ship Mary Rose.

 

Institute of Environmental Physics


This Radiocarbon Laboratory at the Universität Heidelberg in Heidelberg, Germany, is part of the Institute for Environmental Physics. Dr. Bernd Kromer is in charge of this laboratory, and he and his research have been instrumental for developing and extending the radiocarbon calibration time scale. Dr. Kromer has worked extensively with the late Dr. Bernd Becker. This site provides detailed information about their research, and also provides a list of their publications.

 

Laboratory for Paleoclimatology and Climatology

"The LPC is a laboratory of the Department of Geography at the University of Ottawa (Ottawa, Ontario, Canada). We are involved in the analysis and modelling of climate changes and their impacts on ecosystems. These pages describe the people working in the laboratory, the projects in which we are involved, and the facilities available for research on environmental change. The emphasis of our work is the analysis of the past (the fossil record) as a way to better understand the present and the future."

 

Micha Beuting, Musical Instruments and Art Objects

Dr. Beuting's special fields are the microscopic identification of wood species and the age determination of musical instruments and art objects by analyzing the tree-ring structure. This non-destructive scientific method addresses itself as a service to museums, collectors, insurance agencies, auction houses, dealers, and luthiers. Dr. Beuting has worked closely with Dr. Peter Klein and his dissertation research concerned the wood structure and dendrochronological analyses of musical instruments.

 

Ökologie Büro Hofmann

Frieder Hofmann notes that the special topic of this laboratory is dedicated to environmental pollution issues and forensic dendrochronology using chemical and isotopic fingerprinting methods. This lab is also involved with  monitoring emission effect by means of biological and technical monitoring procedures, the development of pollution histories from tree-ring data, and integrated environmental monitoring.

 

Oxford Dendrochronology Laboratory

This laboratory, operated by Daniel H. Miles and Martin Bridge, is an independent tree-ring dating facility that maintains close ties with the Research Laboratory for Archaeology and the History of Art, Oxford University (see below). Their research concentrates primarily on the dating and analysis of standing timber structures, although other projects have involved Medieval wet wood, development of a miniature core extraction system, and collection of juniper samples from the Sierra Nevada of California.

 

Oxford Tree-Ring Laboratory

The Oxford Tree-Ring Laboratory was formed in 2010 by Michael Worthington and Jane Seiter to provide cutting-edge dendrochronological services to archaeologists, architectural historians, art historians, cultural resource managers, and private house owners. Although they specialize in the tree-ring dating of standing buildings, they also provide dates for archaeological artifacts, boats, wooden panel paintings, and live trees. They accept private and commercial commissions throughout the USA, the UK, continental Europe, and the Caribbean.

 

Paleofloods in the Red River Basin

"The Geological Survey of Canada (GSC) and the Manitoba Geological Survey (MGS) have initiated a large, multi-disciplinary research program on flood hazards in the Red River Basin. This project will develop an accurate record of high magnitude floods in the Red River over the last 500 years and determine the impact of long-term climatic and environmental changes on flood frequency and magnitude." Be sure to visit their "Accomplishments" which provides detailed information on their dendrochronology laboratory and the results to date.

 

Pressler GmbH

The laboratory at Pressler GmbH has more than 25 years of experience in Dendrochronology. Currently, nearly 20,000 samples from Central Europe have been analyzed, evaluated, and dated. Chronologies from Germany, France, the Benelux countries, Scandinavia, and the Baltic countries are at the disposal of the laboratory. Work at the laboratory is accompanied and supported by longtime experience and work in the field of building research and recently in the field of archaeology as well. All disciplines complement each other in the company in an ideal way.

 

Rocky Mountain Tree-Ring Research, Inc.


Peter Brown, one of the most active scientists in dendrochronology, began this non-profit company in 1997, having received his formal training at the Laboratory of Tree-Ring Research. He is very active in reconstructions of fire history, and has recently begun research in climate reconstructions and the development of ecosystem management plans. These pages provide information on RMTRR, Inc., and are well-organized and easy to navigate.

The OLDLIST database: oldest individual trees for each species

 

Tree-Ring Services

This independent company is located in Berkshire, United Kingdom, and offers a tree-ring dating and dendroclimatological analysis for companies, professional archaeologists, historians and individuals alike. The firm is operated by Dr. Andy Moir, who provides "tree-ring analysis of live trees and archaeological timbers". The site contains an introduction to dendrochronology, a list of tree species (with useful photographs) suitable for tree-ring dating (in the United Kingdom), and a listing of services and pricing information.

 


Links to Personal Home Pages

Marc D. Abrams, School of Forest Resources, Penn State University, Pennsylvania, USA
Craig Allen
, Jemez Mountains Field Station, Los Alamos, New Mexico, USA
Kevin Anchukaitis
, Woods Hole Oceanographic Institute, Woods Hole, Massachusetts, USA
Fred Baes, III, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
Michael G.L. Baillie
, Queen's University of Belfast, United Kingdom
David J. Barclay, Department of Geology, State University of New York College at Cortland, USA
Bruce Bauer, National Geophysical Data Center, Boulder, Colorado, USA
Yves Bégin
, Centre d'études nordiques, Université Laval, Canada
Yves Bergeron
, Groupe de recherche en ecologie forestiere, Université du Québec a Montreal, Canada
Franco Biondi
, Department of Geography, University of Nevada - Reno, USA
Peter Brewer, Cornell Tree-Ring Laboratory, Cornell University, USA
Keith Briffa, Climatic Research Unit, University of East Anglia, United Kingdom
Peter M. Brown, Rocky Mountain Tree-Ring Research, Ft. Collins, Colorado, USA
Brendan Buckley, Lamont-Doherty Earth Observatory, Columbia University, USA
William M. Buhay
, Department of Geography, University of Winnipeg, Canada
Andy Bunn, Department of Environmental Sciences, Western Washington University, USA
David Butler
, Department of Geography, Texas State University, USA
Marco Carrer, Treeline Ecology Research Unit, Università degli Studi di Padova, Italy
Paolo Cherubini
, Swiss Federal Institute for Forest, Snow and Landscape Research, Switzerland
Malcolm Cleaveland
, Department of Geography, University of Arkansas, USA
Ed Cook, Lamont-Doherty Earth Observatory, Columbia University, USA
Adam Csank, Laboratory of Tree-Ring Research, The University of Arizona, USA
Katarina Cufar, Dendrochronological Laboratory, University of Ljubljana, Slovenia
Rosanne D'Arrigo, Lamont-Doherty Earth Observatory, Columbia University, USA
Nicole K. Davi, Lamont-Doherty Earth Observatory, Columbia University, USA
Andrew De Volder, Quaternary Studies Program, Northern Arizona University, USA
David R. DeWalle
, School of Forest Resources, The Pennsylvania State University, USA
Michèle Kaennel Dobbertin
, Swiss Federal Institute for Forestry, Birmensdorf, Switzerland
Jim Ehleringer, Department of Biology, University of Utah, USA
Michael N. Evans, Department of Geology, The University of Maryland, USA
Donald A. Falk, Laboratory of Tree-Ring Research, The University of Arizona, USA
Calvin Farris, Laboratory of Tree-Ring Research, The University of Arizona, USA
Xiahong Feng, Department of Earth Sciences, Dartmouth College, USA
Louise Filion
, Département de géographie, Université Laval, Canada
Harold C. Fritts, Laboratory of Tree-Ring Research, The University of Arizona, USA
Gregg Garfin
, Institute of the Environment, The University of Arizona, USA
Jeffrey H. Gove, Northeastern Forest Experiment Station, Durham, NH, USA
John Grattan
, Institute of Geography and Earth Sciences, Aberystwyth University, United Kingdom
Carol Griggs, Cornell Tree-Ring Laboratory, Cornell University, USA
Henri D. Grissino-Mayer, Department of Geography, The University of Tennessee, USA
Christine Hallman, Laboratory of Tree-Ring Research, The University of Arizona, USA
Justin L. Hart, Department of Geography, University of Alabama, USA
Katie Hirschboeck, Laboratory of Tree-Ring Research, The University of Arizona, USA
Frieder Hofmann
, Ökologiebüro, TIEM Integrated Environmental Monitoring, Germany
Sally Horn
, Department of Geography, University of Tennessee, Knoxville, Tennessee, USA
Laurie Huckaby, USDA Forest Service, Rocky Mountain Research Station
Gordon Jacoby, Lamont-Doherty Earth Observatory, Columbia University, USA
Glenn Juday, Department of Forest Ecology, University of Alaska - Fairbanks, USA
Margot W. Kaye, School of Forest Resources, The Pennsylvania State University, USA
Cornelia Krause, Laboratoire d'écologie végétale - Université du Québec à Chicoutimi - Canada
Barbara L. Lachenbruch, Department of Wood Science and Engineering, Oregon State University, USA
Peter Ian Kuniholm, Cornell Tree-Ring Laboratory, Cornell University, USA
Lisa LaForest, Department of Ecology and Evolutionary Biology, University of Tennessee, USA
Colin Laroque
, Mount Allison University, Sackville, New Brunswick, Canada
Steven W. Leavitt, Laboratory of Tree-Ring Research, The University of Arizona, Tucson, USA
Ken Lertzman
, Resource and Environmental Management, Simon Fraser University, Canada
Andrea H. Lloyd, Department of Biology, Middlebury College, Vermont, USA
Brian Luckman
, Department of Geography, University of Western Ontario, Canada
Glen MacDonald
, Department of Geography, University of California - Los Angeles, USA
Sturt Manning, Cornell Tree-Ring Laboratory, Cornell University, USA
Ellis Margolis, Laboratory of Tree-Ring Research, The University of Arizona, Tucson, USA
Jesus Julio Camarero Martinez, ARAID-Instituto Pirenaico de Ecología (CSIC), Zaragoza, Spain
Brian C. McCarthy, Dept. of Environmental and Plant Biology, Ohio University, Athens, USA
Dave M. Meko, Laboratory of Tree-Ring Research, The University of Arizona, Tucson, USA
Renzo Motta
, Dipartimento di Agronomia, Selvicoltura e Gestione del Territorio, Università degli Studi di Torino, Italy
Martin Munro, Laboratory of Tree-Ring Research, The University of Arizona, Tucson, USA
Steve Norman, U.S. Forest Service, Southern Research Station, Asheville, North Carolina
Momchil Panayotov, Dendrochronology Laboratory, University of Forestry, Bulgaria
Irina P. Panyushkina, Laboratory of Tree-Ring Research, The University of Arizona, Tucson, USA
Serge Payette, Centre d'études nordiques, Université Laval, Canada
Charlotte Pearson, Cornell Tree-Ring Laboratory, Cornell University, USA
Neil Pederson
, Lamont-Doherty Earth Observatory, Columbia University, USA
Shelly Rayback, Department of Geography, University of Vermont, USA
John Sakulich, Department of Biology, Regis University, USA
Matt Salzer, Laboratory of Tree-Ring Research, The University of Arizona, USA
Fritz H. Schweingruber, Swiss Federal Institute for Forest, Snow and Landscape Research, Switzerland
Paul Sheppard
, Laboratory of Tree-Ring Research, The University of Arizona, USA
Dan Smith, Tree-Ring Laboratory, The University of Victoria, Canada
R. Scott St. George, Department of Geography, University of Minnesotaa, USA
Dave Stahle
, Department of Geosciences, University of Arkansas, USA
Tom Swetnam
, Laboratory of Tree-Ring Research, The University of Arizona, USA
Jacques Tardif, Centre for Forest Interdisciplinary Research, University of Winnipeg, Canada
Alan Taylor, Department of Geography, The Pennsylvania State University, USA
Ramzi Touchan
, Laboratory of Tree-Ring Research, The University of Arizona, USA
Ronald H. Towner
, Laboratory of Tree-Ring Research, The University of Arizona, USA
Cathy Tyers, Sheffield Dendrochronology Laboratory, Sheffield, United Kingdom
Saskia van de Gevel, Department of Geography and Planning, Appalachian State University, USA
Barbara Vokal, Department of Physical and Organic Chemistry, Jozef Stefan Institute, Ljubljana, Slovenia
Tomasz Wazny, Cornell Tree-Ring Laboratory, Cornell University, USA
Carola Wenk, Department of Computer Sciences, Tulane University, USA
Greg Wiles
, Department of Geology, The College of Wooster, USA
Erika Wise, Department of Geography, University of North Carolina-Chapel Hill, USA
Connie Woodhouse, School of Geography and Development, University of Arizona, USA
Pentti Zetterberg, Karelian Institute, University of Joensuu, Joensuu, Finland

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