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Research Interests:
  • Global Warming & Biodiversity Conservation – The billions of tons of carbon dioxide we’re dumping into the atmosphere every year may be undoing millions of years of evolution in a geological blink of time. The last time CO2 levels were as high as they are today was about twenty-three million years ago. Our current best estimate is that more than a million species —16% of species on earth — are vulnerable to extinction from climate change this century.
  • Conservation Biogeography – Environmental changes are driving shifts in the geographic distribution of species. What management actions can we take to save disappearing wildlife?
Peer-Reviewed Articles:
Technical Reports:
  • Stewart J.A.E. (2017) High-elevation species and natural communities in the northern Sierra Nevada, final report: State Wildlife Grant F14AF00632. California Department of Fish and Wildlife, Rancho Cordova, CA.
  • Stewart J.A.E. (2013) Distribution and abundance of pikas in the greater Yosemite ecoregion: final report. George Melendez Wright Climate Change Fellowship Program, Hancock, MI. 

Our research on the American pika was recently featured on the National Geographic Channel.

Invited Seminars:
  • Stewart, J.A.E. (2016) Invited Seminar. Methods for assessing vulnerability of species to climate change. National Institute of Ecology, Seocheon, South Korea.
  • Stewart, J.A.E. (2014) Invited Seminar. On the distribution and abundance of pikas in Yosemite. Yosemite Forum, Yosemite Valley, CA.
Selected Presentations:
  • Stewart, J.A.E. and H.S. Butterfield. (2017) Invited Presentation. Habitat restoration opportunities for endangered species of the San Joaquin Desert. San Joaquin Desert Strategic Fallowing Workshop, National Center for Ecological Analysis and Synthesis, Santa Barbara, CA.
  • Stewart, J.A.E. (2016) Descent to the underworld: climate change opens gap in distribution of American pika in the Sierra Nevada, USA. Mathias Symposium, Bodega Bay, CA.
  • Stewart, J.A.E. (2016) On the vulnerability of biodiversity to climate change. Science on Tap, a monthly lecture organized by UCSC Women in Science and Engineering, Santa Cruz, CA.
  • Stewart, J.A.E., B. Sinervo, M.F. Westphal, H.S. Butterfield, E. Tennant. (2015) Interaction of exotic grasses and climate drives contraction of blunt-nosed leopard lizard range at the northern range margin. Thirteenth Annual Species Interaction Workshop, Stanford University, Stanford, CA.
  • Stewart, J.A.E., M. Gogol-Prokurat, J.H. Thorne, E. Tennant, B. Sinervo, M.F. Westphal, H.S. Butterfield, D.H. Wright. (2015) Assessing climate change vulnerability of California species. California Dept. of Fish and Wildlife Science Symposium, Davis, CA.
  • Stewart, J.A.E., B. Sinervo, M.F. Westphal, and H.S. Butterfield. (2015) Temporal and spatial relationships between vegetation productivity and type and the endangered blunt-nosed leopard lizard. California Native Plant Society Conservation Conference, San Jose, CA.
  • Stewart, J.A.E. (2013) Interactions between climate, vegetation, prey, and the federally endangered blunt-nosed leopard lizard (Gambelia sila). Eleventh Annual Species Interaction Workshop, Stanford University, Stanford, CA.
  • Stewart, J.A.E., R.D. Cooper, M. Westphal, S. Butterfield, and B. Sinervo. (2013) The potential impacts of climate change on local extinction of blunt-nosed leopard lizards. Blunt-Nosed Leopard Lizard Workshop, California State University Bakersfield, CA.
  • Stewart, J.A.E. (2013) Using historic revisit data to model climate change impacts on pikas. Annual Conference the Western Section of The Wildlife Society, Sacramento, CA.
  • Stewart, J.A.E. (2013) Pikas in Yosemite: patterns of occurence at two spatial scales. George Wright Society Conference on Parks, Protected Areas, and Cultural Sites, Denver, CO.
  • Stewart, J.A.E. (2012) Moving beyond resurveys of historic pika record locations: using relict feces to test the hypothesis of climate-mediated range retreat in California, Ecological Society of American Meeting, Portland, OR.
  • Stewart, J.A.E., J.D. Perrine, D.H. Wright, and C.P. Massing. (2012) Resurvey of historical pika locations in California: analysis and critique, North American Congress for Conservation Biology, Oakland, CA.
  • Stewart, J.A.E., and D.H. Wright. (2011) Persistence and apparent extirpation of American pika (Ochotona princeps) at historical California localities. Annual Conference the Western Section of The Wildlife Society, Riverside, CA. *Received award for best student presentation.
  • Stewart, J.A.E., and D.H. Wright. (2010) Investigating the status of American pika (Ochotona princeps) at historical northern Sierra sites. Annual Bay Area Conservation Biology Symposium, San Francisco State University, CA.
Citizen Science ->> Pika Citizen Science Survey – adventurers and citizen scientists invited to help collect baseline data on pika occupancy in areas where climate change may cause local extinction over the coming decades. Places mammal species haven’t been documented for decades – have you seen any of these mammal species in California? Document your observations on iNaturalist!
Crowdfunding ->>How much does global warming threaten the American pika? -Mycroryza-crowdfunding for science

Gambelia sila, BNLLPika_RoundTop_crop_IMG_3190Urocitellus beldingi2014-07-18 19.44.58