Life on the edge-a changing genetic landscape within an iconic American pika metapopulation over the last half century.

The small sample size from 1948–1949 precludes an accurate assessment of relatedness on a population wide basis for this early time period, but there was a clear trend in the increase in relatedness over time with low average relatedness in 1948–1949 ( r = −0.068, 95% CI [−0.113 to 0.128]) and 1988–1991 ( r = 0.024, 95% CI [−0.060 to 0.060]) but an r value consistent with an average relatedness among first cousins ( r = 0.158, 9% CI [−0.028 to 0.021]) in 2013–2015 ( Fig. 5F ).

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