Triangulating from the cairns…
Age effects on maximum running speed (MRS) in yellow-bellied marmots (Marmota flaviventris) were examined to see whether this performance trait varied with age. Individuals were trapped in Tomahawk livetraps, then released and encouraged to run to burrows by yelling and chasing over varying distances. Factors possibly affecting the MRS including incline, distance run, age, sex, and substrate were recorded and controlled for in a general linear model that sought to explain variation in run time. I found that distance run and substrate have significant effects on run time, while age, incline, and sex had insignificant effects on run time. However, younger marmots ran over a wider range of speeds than older marmots. This suggested that yellow-bellied marmots did not experience somatic senescence although there appeared to be natural selection for locomotor ability.
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