Patricia Valcarcel, CWB®

Senior Biologist


Patricia Valcarcel earned a MS in Wildlife Sciences while conducting research on the spatial ecology of the threatened giant gartersnake. She has worked on a variety of field research projects ranging from animal movements to behavior and reproduction. She has presented her work at conferences and published in peer-reviewed journals. She is also trained on a variety of sampling techniques including collection of samples for environmental DNA (eDNA) analysis and implemented this method for detection of giant gartersnake. The results are used in combination with other methods to help inform on presence of the cryptic species.

Patricia has extensive experience working with and permitting for special-status species in California. Her focus is reptile and amphibian species, but has broad experience with wildlife species in California’s Central Valley.  Her primary responsibilities are to conduct habitat assessments, prepare associated technical reports and permit applications, and consult with wildlife agencies on special-status wildlife species. She consults with both federal and state wildlife agencies and has prepared federal Section 7 Biological Assessments, federal Section 10 Habitat Conservation Plans, and California Incidental Take Permits for complicated and long-term projects.  In addition, Patricia is involved in environmental permitting, permit compliance, and mitigation and monitoring efforts associated with these permits.


Halstead, B.J., Valcarcel, P., Wylie, G.D., Coates, P.S., Casazza, M. L., and Rosenberg, D.K. 2016. Active Season Microhabitat and Vegetation Selection by Giant Gartersnakes Associated with a Restored Marsh in California. Journal of Fish and Wildlife Management 7(2): 397-407.

Halstead, B.J., Wylie, G.D., Coates, P.S., Valcarcel, P., and Casazza, M. L. 2012. Bayesian shared frailty models for regional inference about wildlife survival. Animal Conservation 15: 117–124.

Valcarcel, P. 2011. Giant gartersnake spatial ecology in agricultural and constructed wetlands. Corvallis, Oregon, Oregon State University. Master’s thesis.


Flat-tailed Horned Lizard Habitat Modelling, Bureau of Land Management, Yuma, Arizona

Clark County Multi-Species Habitat Conservation Plan, Desert Conservation Program, Clark County, Nevada

Liberty Ranch Development Project, Galt, Sacramento County, California

Zeiss Graphite Development Project, Dublin, Alameda County, California

Sherman Island Whale’s Mouth Wetland Restoration Project, Sacramento County, California

San Joaquin Council of Governments, Multi-Species Habitat Conservation and Open Space Plan On-Call, San Joaquin County, California

Antonio Mountain Ranch Mitigation Bank, Placer County, California

City of Modesto General Plan Update EIR, Modesto, California

Port of Oakland Maintenance Dredging, Oakland, California

Bruno’s Island Bridge Repair Project, Southwestern Sacramento County, California

Napa Valley Marina Permitting and Dredge Monitoring, Napa, California

Burrowing Owl Surveys and Passive Exclusion, Antioch, California

Vulcan Materials Pilarcitos Quarry, San Mateo County, California

White Rock Lake Maintenance Project, Monterey County, California

Wavecrest Coastal Trail Northern and Southern Alignments, Half Moon Bay, San Mateo County, California

Petersen Ranch Mitigation Bank Project, Los Angeles County, California


MS, Wildlife Sciences, Oregon State University. 2011

BA, Environmental Sciences, Northwestern University. 2003


USFWS Recovery Permit for giant gartersnake and San Francisco gartersnake (TE-64146A-1)

Certified Wildlife Biologist – Wildlife Society

California Department of Fish and Wildlife Scientific Collecting Permit