Workshop on Declining Amphibian Populations of
California and Nevada:
Causes and Solutions

2001 Annual Meeting of the Western Section of The Wildlife Society

February 22, 2001
Sacramento, CA
David Bradford, U.S. Environmental Protection Agency, Las Vegas, NV

8:00 - 8:10 am  Introduction.  David F. Bradford

DISEASE SESSION

Moderator:  Gary M. Fellers, U.S. Geological Survey, Point Reyes, CA

8:10 - 8:20 am  Introduction.  Gary M. Fellers

8:20 - 8:50 am Viral and Fungal Pathogens in Tiger Salamanders in the Western United States and Canada.  James Collins1, Elizabeth Davidson1, Joyce Longcore2, Allan Pessier3, Matthew Parris4,  James Jancovich1, Jesse Brunner1, Danna Schock1, and Andrew Storfer5.  1Biology, Arizona State Univ., Tempe, AZ; 2Biological Sciences, Univ. of Maine, Orono, ME; 3Univ. of Illinois Zoological Pathology Program, Loyola Univ. Medical Center, Maywood, IL; 4Biology, Univ. of Memphis, Memphis, TN; 5 Wildlife Ecology and Conservation, Univ. of Florida, Gainesville, FL.

8:50 - 9:00 am Recent Observations of Chytridiomycosis among Amphibians in California.  Gary Fellers, Western Ecology Research Center, USGS, Point Reyes, CA.

9:00 - 9:10 am Recent Observations of Chytridiomycosis in the Mountain Yellow-legged Frog in the Sierra Nevada.  Roland Knapp, Sierra Nevada Aquatic Research Laboratory, University of California, Mammoth Lakes, CA.

9:10 - 9:20 am  Comparison of Mountain Yellow-legged Frog Size Classes in Populations with and without Chytridiomycosis Infections.  Karen Pope and Kathleen Matthews, USFS Pacific Southwest Research Station, Albany, CA.

9:20 - 9:40 am Parallels Between Mass Mortalities of Montane Amphibians in the Sierra Nevada and the Rockies of Colorado.  Cynthia Carey, Dept. of EPO Biology, University of Colorado, Boulder, CO.

9:40 - 10:10 am  Break

CONTAMINANTS SESSION

Moderator:  Carlos Davidson, California State University, Sacramento, CA

10:10 - 10:30 am California Amphibian Declines, Prevailing Winds and Agricultural Land Use.  Carlos Davidson1, Brad Shaffer2, and Mark Jennings31Dept. of Environmental Studies, California State University, Sacramento, CA; 2Section of Evolution & Ecology, University of California, Davis, CA; 3US Geological Survey, San Simeon, CA, and Dept. of Herpetology, California Academy of Sciences, San Francisco, CA.

10:30 - 10:50 am  Biological Effects of Pesticides on Declining Amphibian Populations in the Sierra Nevada.  Donald Sparling1, Gary Fellers2, Laura McConnell3, and Deborah Cowman41USGS Patuxent Wildlife Research Center, Laurel, MD; 2Western Ecology Research Center, USGS, Point Reyes, CA; 3USDA Agriculture Research Center, Beltsville, MD; 4Dept. of Fisheries and Wildlife, Texas A&M University, College Station, TX

10:50 - 11:10 am Test of an Environmental Model: Red-legged Frogs as Bioindicators of Endocrine-disrupting Contaminants.  James Bettaso1, 2, Hartwell Welsh2, and Brent Palmer31Wildlife Dept., Humboldt State University, Arcata, CA; 2USDA Forest Service, Redwood Sciences Laboratory, Arcata, CA; T.H. Morgan School of Biological Sciences, 3Univeristy of Kentucky, Lexington, KT.

LISTING OF THREATENED AND ENDANGERED SPECIES SESSION

Moderator:  Steve Morey, U.S. Fish and Wildlife Service, Portland, OR.

11:10 - 11:30 am  Listing Threatened and Endangered Amphibians: California and Nevada Update.  Steve Morey, U.S. Fish and Wildlife Service, Portland, OR.

11:30 - 11:50 am The Santa Barbara Tiger Salamander Emergency Listing: The Interplay of Systematics, Genetics, and Land Use Practices.  H. Bradley Shaffer, Section of Evolution and Ecology, University of California, Davis, CA.

11:50 -12:10 pm The Southern California Distinct Population Segment of the Mountain Yellow-legged Frog:  Evaluating Extinction Threats and Developing Recovery Strategies.  Glen Knowles, U.S. Fish and Wildlife Service, Carlsbad, CA.

12:10 - 1:40 pm  Lunch

EXOTIC SPECIES SESSION

Moderator:   Roland Knapp, University of California, Mammoth Lakes, CA.

1:40 - 2:00 pm Amphibian Assemblages and Introduced fishes in the Trinity Alps Wilderness of the Klamath Mountains of Northwestern California.  Hartwell Welsh, Jr., and Daniel Boiano.  USDA, Forest Service, Redwood Sciences Laboratory, Arcata, CA.

2:00 - 2:20 pm Removal of Nonnative Trout from Sierra Nevada Lakes as a Means to Recover Mountain Yellow-legged Frog Populations.  Roland Knapp1, Vance Vredenburg2, and Curtis Milliron31Sierra Nevada Aquatic Research Laboratory, University of California, Mammoth Lakes, CA;  2Dept. of Integrative Biology and Museum of Vertebrate Zoology, University of California, Berkeley, CA; 3California Dept. of Fish and Game, Bishop, CA.

2:20 - 2:40 pm Update on the Efforts to Determine the Status of Native Amphibian Fauna in Southern California and the Development of Invasive Aquatic Species Eradication Techniques.  Edward Ervin and Robert Fisher.  US Geological Survey, Department of Biology, San Diego State University, San Diego, CA.

2:40 - 3:00 pm Genetic Pollution, California Tiger Salamanders, and Endangered Species Remediation.  H. Bradley Shaffer and Benjamin Fitzpatrick, Section of Evolution & Ecology, University of California, Davis, CA. 

3:00 - 3:30 pm Break

FOREST MANAGEMENT SESSION

Moderator:    Hartwell H. Welsh, Jr., U.S. Forest Service, Arcata, CA.

3:30 - 3:50 pm Comparison of Abundance, Assemblage, and Activity of Nocturnal Amphibians in Old Growth and Second Growth Redwood Forest Creeks in Humboldt County, California.  Don Ashton1, Hartwell Welsh, Jr.2, and Sharyn Marks11Dept. of Biological Sciences, Humboldt State University, Arcata, CA; 2USDA, Forest Service, Redwood Sciences Laboratory, Arcata, CA.

3:50 - 4:10 pm Effects of Silvicultural Edges on Terrestrial Amphibian Abundance and Microclimate in Northwestern California.  Nancy Karraker1 and Hartwell Welsh, Jr.21Humboldt State University, Arcata, CA;  2USDA Forest Service, Redwood Sciences Laboratory, Arcata, CA.

4:10 - 4:30 pm Habitat Alterations and Amphibian Populations: The Role of Forestry in the Decline of Amphibians in Northern California.  Hartwell Welsh, Jr., and Lisa Ollivier, USDA Forest Service, Pacific Redwood Sciences Laboratory, Arcata, CA.

4:30 - 4:50 pm Forest Management and Conservation in the Sierra Nevada: Implications for Amphibians.  Amy Lind.  USDA Forest Service, Pacific Southwest Research Station, Sierra Nevada Framework Project, Sacramento, CA.

4:50 - 5:25 pm Briefings

5:25 -5:30 pm Concluding Remarks.  David Bradford                         

POSTER SESSION

The Status of the Northern Leopard Frog (Rana pipiens) in Nevada.  Cynthia Hitchcock, Dept. of Biology, University of Nevada, Reno.

Effects of Agricultural Pesticides on Translocated Egg Masses and Tadpoles of the Pacific Treefrog in Lassen, Yosemite, and Sequoia National Parks.  Deborah F. Cowman1, Donald W. Sparling2, Gary Fellers3, and Thomas E. Lacher41Wildlife and Fisheries Sciences Dept., Texas A&M Univ., College Station, TX; 2USGS Patuxent Wildlife Research Center, Laurel, MD;    3USGS, Point Reyes National Seashore, Point Reyes, CA; 4 Wildlife and Fisheries Sciences Dept., Texas A&M Univ, College Station, TX.

Oviposition Sites of the Amargosa Toad (Bufo nelsoni).  Denise Jones, C.R. Tracy, and Eric Simandle.  Dept. of Biology, University of Nevada, Reno.