Research Interests:
  • Forest Regeneration and Restoration – Severe fires and a changing climate are contributing to poor postfire conifer regeneration in California. Where are forests regenerating and where are they not? When managers opt for restoration, where should seeds be sourced from to account for climate change?
  • Conservation Biogeography – Environmental changes are driving shifts in the geographic distribution of species. What management actions can we take to save disappearing wildlife?
Decision Support Tools:
  • Climate Adapted Seed Tool – Rapid climate change has caused a mismatch between the climate that tree populations have adapted to and the climate they currently grow in. This tool helps ecosystem managers identify seed sources that are pre-adapted to local climate conditions at their planting sites.
  • Postfire Spatial Conifer Restoration Planning Tool – Large and severe wildfires are leaving vast areas devoid of natural conifer regeneration. This tool aids managers in prioritizing areas for restoration by providing maps of predicted postfire conifer regeneration. It includes taxon-specific regeneration predictions and a range of postfire climate and seed production scenarios.
  • Pika Extirpation Predicter – This is an interactive supplement to our paper on pika extirpations in California. Adjust the slider to see where American pika populations are predicted to become extinct as temperatures warm.
  • COVID Risk Decision Support Tool – This app provides information to help houses/pods make informed decisions about the risk of getting and spreading COVID.
Peer-Reviewed Papers:
Technical Reports:
Our research on the American pika was recently featured on the National Geographic Channel.
Selected Press Coverage:
Invited Seminars:
  • Stewart J.A.E. (2018) Invited Seminar. Conserving wildlife in a changing world. Sierra Science Lecture Series, Sierra College, Grass Valley, CA.
  • 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. & D.H. Wright. (2017) Invited Presentation. Geographically representative surveys of whitebark pine occurrence and stand characteristics in the northern Sierra with implications for vulnerability to climate change. Field-based Studies on Whitebark Pine in California – A Data Sharing Session, Parsons Lodge, Yosemite National Park, CA.
  • Stewart J.A.E. & 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) Invited Presentation. 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, & 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, & 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 occurrence 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, & 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., & 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., & 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:

Gambelia sila, BNLLPika_RoundTop_crop_IMG_3190Urocitellus beldingi2014-07-18 19.44.58