US Forest Service Research & Development
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  • US Forest Service Research & Development
  • 1400 Independence Ave., SW
  • Washington, D.C. 20250-0003
  • 800-832-1355
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Dr. Hartwell H. Welsh

Hart Welsh

Emeritus Scientist
1700 Bayview Drive
United States

Phone: 707-825-2956
Contact Hart Welsh

Current Research

Hartwell Welsh conducts research documenting the ecological roles of amphibians and reptiles, including their trophic relatinships, population status, and sensitivities to natural and anthropogenic perturbations; information critical to preserving these unique creatures and highlighting their importance within ecosystems and illuminating the ecological services they perform.

Research Interests

amphibian and reptile natural history, their population status, their sensitivity to natural and anthropogenic purturbations, and their use as biometrics of ecosystem status.

Past Research

Welsh has led studies on the use of amphibians as indicators of both terrestrial and aquatic ecosystem status. Amphibians are extremely sensitive to relatively small changes in microclimate and are habitat specialists highly adapted to specific environmental features. These characteristics allow them to serve as veritable barometers of ecosystem health and status. Most recently, Welsh developed a blueprint for using amphibians in Pacific Northwest streams to monitor their potential to support ecological services, such as production of commercially valuable salmonid species.

In other studies, Welsh developed habitat models for many forest amphibians and reptiles of the Pacific Northwest. These models provide managers with a description of the habitat requirements of these species, which allow the managers to address human-caused stresses such as timber harvest and water diversions. One of Welsh's latest models was created using Forest Inventory and Analysis (FIA) data, a unique approach that was not initially envisioned within the FIA Program.


  • University of California, Berkeley, Ph.D. Wildlife Ecology 1993
  • Humboldt State University, M.S. Wildlife Biology 1976
  • University of California, Berkeley, B.A. Zoology 1972

Professional Organizations

  • Society for Conservation Biology, Member
  • Society for the Study of Amphibians and Reptiles, Member
  • American Society of Ichthyology and Herpetology, Member

Featured Publications & Products


Research Highlights


Friends in Low Places: How Salamanders Help Mitigate the Impacts of Climate Change

Woodland salamanders perform a vital ecological service in American forests by slowing the release of carbon in the form of leaf litter on the f ...


Woodland Salamanders are Indicators of Redwood Forest Recovery

Forest Service researchers have found that two common salamander species provide a way of measuring the recovery of previously harvested redwood ...


Last updated on : 10/14/2016