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Download Petition to List the American Pika (Ochotona princeps)
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Petition to List the American Pika (Ochotona princeps) as Threatened in California National Park Service A. Tshcherbina S. Osborn Scott Osborn and Daniel Applebee Dept. of Fish and Game - Wildlife Branch Petition History 2007 Aug Center for Biological Diversity petition Dec DFG evaluation report 2008 Apr Commission rejects petition 2009 May Petitioner suit regarding decision standard upheld Jun 2010 Oct Commission rejects petition Petitioner suit regarding new information upheld 2011 Feb Commission refers the amended petition to DFG May Additional new information referred to DFG Sep DFG evaluation report A. Smith Appearance P. Mirejovsky Taxonomy Two pika species in N. America • Collared pika (Ochotona collaris) - AK, nw Canada • American pika (Ochotona princeps) - BC, western US Taxonomic revision (Hafner and Smith 2010) One subspecies in CA: Ochotona princeps schisticeps AnimalSpot.net A. Tshcherbina Range in California: • Sierra Nevada • Southern Cascades • Modoc Plateau • Great Basin Ranges Habitat Associations Photos: S. Osborn Habitat Associations Photos: S. Eng/USDA-Forest Service Habitat Associations Photos: C. Millar, S. Eng, C. Millar Diet AnimalSpot.net Thermoregulation AnimalSpot.net Distribution Resurveys of historical pika sites • Yosemite • Bodie townsite • Lassen • Mt Shasta • Lava Beds NM • Central Sierra • Eastern Sierra • White-Inyo mtns Climate Change • Heat stress during summer • Behavior to avoid heat stress • Cold stress during winter • Reduced dispersal (A.J. Ray et al. 2010) Climate Change • Heat stress during summer • Behavior to avoid heat stress • Cold stress during winter • Reduced dispersal • Ecosystem changes • Reduced area of suitable habitat • Combined and interactive effects Photos: L. Comrack, R. Padilla, Cal-Acad Sci. Climate Change • Heat stress during summer • Behavior to avoid heat stress • Cold stress during winter • Reduced dispersal • Ecosystem changes • Reduced area of suitable habitat • Combined and interactive effects (Beever et al. (Galbreath et 2011) al. 2009) Other Threats • Grazing • Mining • Small, isolated populations • Disease • Predation • Competition Conclusions 1. Pikas appear to be welldistributed in CA 2. Pikas are absent from some sites where they historically occurred 3. Pikas have been impacted by climate change in the Great Basin 4. Models predict a reduction in pika habitat in CA over the next century 5. The magnitude of other threats is unknown A. Tshcherbina
