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Apparent climate-mediated loss and fragmentation of core habitat of the American pika in the Northern Sierra Nevada, California, USA

Fig 2

Calibrated age ranges for each of the remnant pika scat samples.

The gray curves show the probability distribution of dates corresponding to each sample’s Fm estimate. Samples are stacked for comparison. The blue curve shows the radiocarbon signature of the atmosphere over time. This is the calibration curve used to estimate the ages of the relict pika scat. See text for definition of Fm units.

Fig 2