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  1. Thermal components of American pika habitat—How does a small lagomorph encounter climate?

    Anticipating the response of small mammals to climate change requires knowledge of thermal conditions of their habitat during times of the day and year when individuals use them. We measured diurnal and seasonal temperatures of free air and of six habitat components for American pikas (Ochotona princeps) over five years at 37 sites in seven...

    Author(s):
    Connie Millar; Bob Westfall; Diane L. Delany
    Year:
    2016
    Keywords:
    pika, American pika, Ochotona princeps
    Source:
    Arctic, Antarctic, and Alpine Research. 48(2):327–343

  2. 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

    We used a rapid assessment to survey American pika (Ochotona princeps) populations and documented 420 pika site occurrences in southwestern U.S.A. These included 329 sites from the Sierra Nevada (SN), California; 67 from six southwestern Great Basin (swGB) ranges, California and Nevada; 16 from three central Great Basin ranges, Nevada; and 8 from...

    Author(s):
    Constance I. Millar; Robert D. Westfall
    Year:
    2010
    Keywords:
    Source:
    Arctic, Antarctic, and Alpine Research Vol. 42(1): 76-88

  3. Radiocarbon dating of American pika fecal pellets provides insights into population extirpations and climate refugia

    The American pika (Ochotona princeps) has become a species of concern for its sensitivity to warm temperatures and potential vulnerability to global warming. We explored the value of radiocarbon dating of fecal pellets to address questions of population persistence and timing of site extirpation. Carbon was extracted from pellets collected at 43...

    Author(s):
    Constance I. Millar; Katherine Heckman; Christopher Swanston; Karena Schmidt; Robert D. Westfall; Diane L. Delany
    Year:
    2014
    Keywords:
    American pika, climate refugia, habitat occupancy, historical ecology, isotopes, Ochotona princeps, radiocarbon dating, Sierra Nevada.
    Source:
    Ecological Applications. 24(7): 1748–1768

  4. Thermal regimes and snowpack relations of periglacial talus slopes, Sierra Nevada, California, USA.

    Thermal regimes of eight periglacial talus slopes, at contrasting elevations, aspects, and substrates, in the Sierra Nevada, California, had complex microclimatic patterns partially decoupled from external conditions. Over three years, warm seasons showed mean talus matrix temperatures and daily variances lower than surfaces and cooler than free-air; talus surface and...

    Author(s):
    Constance I Millar; Robert D. Westfall; Diane L. Delany
    Year:
    2014
    Keywords:
    Source:
    Arctic, Antarctic, and Alpine Research. 46(2): 483-504
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