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American pika are thriving in the Sierra Nevada and southwestern Great Basin
Date:3/4/2010

ALBANY, Calif., March 1, 2010New research addressing climate change questions, a priority focus of the USDA Forest Service Pacific Southwest Research Station, documents that American pika in the Sierra Nevada and southwestern Great Basin are thriving and persist in a wider range of temperatures than previously discovered. Results were recently published in a paper titled "Distribution and Climatic Relationships of the American Pika (Ochotona princeps) in the Sierra Nevada and Western Great Basin, U.S.A.; Periglacial Landforms as Refugia in Warming Climates," by Constance Millar and Robert Westfall in the February 2010 issue of the journal Arctic, Antarctic and Alpine Research.

A small mammalian relative of rabbits and hares, the American pika inhabits rocky slopes of western North American mountains. Pikas tolerate cold climate environments through a combination of physiological and behavioral adaptations where these same adaptations may make them sensitive to even mildly warm climates.

Vulnerability of pika habitat to global warming has been an escalating concern, causing speculation that the range of suitable pika habitat will contract upward in elevation as lower elevation site temperatures increase.

Millar and Westfall developed and used a rapid assessment method to detect recent presence of American pika in 94 percent of 420 sites in the Sierra Nevada, California, southwestern Great Basin, central Great Basin and central Oregon Cascades ranges. Occurrence and non-detection sites were then compared to pika's habitat affinities to rock formation types and the climatic features of those sites. Rock-ice feature landforms are important habitat components providing insulation and refugia from outside air temperature increases and accounted for 83 percent of the sites. Site climate data indicate that in this study region, pika tolerate a wider range of temperatures and precipitation than previously interpreted.


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Contact: Allison Kolbe
akolbe@fs.fed.us
510-559-6327
USDA Forest Service, Pacific Southwest Research Station
Source:Eurekalert

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