Petition to List the American Pika (Ochotona princeps) as Threatened in California Scott Osborn and Daniel Applebee Dept. of Fish and Game - Wildlife Branch.

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Presentation transcript:

Petition to List the American Pika (Ochotona princeps) as Threatened in California Scott Osborn and Daniel Applebee Dept. of Fish and Game - Wildlife Branch National Park Service S. Osborn A. Tshcherbina

Petition History 2007 Aug Center for Biological Diversity petition DecDFG evaluation report 2008 AprCommission rejects petition 2009 MayPetitioner suit regarding decision standard upheld JunCommission rejects petition 2010 OctPetitioner suit regarding new information upheld 2011 FebCommission refers the amended petition to DFG MayAdditional new information referred to DFG SepDFG evaluation report A. Smith

Appearance P. Mirejovsky

Taxonomy AnimalSpot.net 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

A. Tshcherbina Range in California: Sierra Nevada Southern Cascades Modoc Plateau Great Basin Ranges

Photos: S. Osborn Habitat Associations

Photos: S. Eng/USDA-Forest Service Habitat Associations

Photos: C. Millar, S. Eng, C. Millar Habitat Associations

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

(A.J. Ray et al. 2010) Heat stress during summer Behavior to avoid heat stress Cold stress during winter Reduced dispersal 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 (Beever et al. 2011) Heat stress during summerHeat stress during summer Behavior to avoid heat stressBehavior to avoid heat stress Cold stress during winterCold stress during winter Reduced dispersalReduced dispersal Ecosystem changesEcosystem changes Reduced area of suitable habitatReduced area of suitable habitat Combined and interactive effectsCombined and interactive effects (Galbreath et al. 2009)

Other Threats Grazing Mining Small, isolated populations Disease Predation Competition

Conclusions 1.Pikas appear to be well- distributed 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