Lecture 23

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Unformatted text preview: 013 Adapted to cold weather. American Pika Adapted for life in high, cold mountains Strive in mountain cold temperatures. Lethal temperature ~ 27C Modeling species loss from sky islands with climate change (1996) • Mammals on mountain ranges in Great Basin • Model assumptions: Climate warms 3 C Habitat moves upward 500 m Habitat area shrinks accordingly Species lost according to habitat loss Species-area relationship. The relationship between area and the number of species that could be supported. From the slope of this line, we get an idea of how one corresponds to the other. As you move up 500m, see how many square meters will be available habitat, and work down the mountain slope. Amount of available habitat area reduced. extinction predicted for the Pika species. 1996 6 4/3/2013 Measuring species loss from sky islands (2003) roughly 28 % extinction rate over a relatively short period of time. • Resampled 25 mountain ranges where pikas had been found earlier • Pikas extirpated in 7 of 25 4. Pollinators (Bumble Bees) The Rocky Mountain Biological Laboratory, Gothic CO Mean snowfall (since 1975) = 11.1 m Range = 4.7 – 16.4 m 7 4/3/2013 Graham Pyke’s altitudinal transects: censuses of bumble bee species, 1974 survey of bumblebees (key pollinators...
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This document was uploaded on 01/27/2014.

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