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Changing environments, whether through natural or anthropogenic causes, can lead to the loss of some selective pressures (‘relaxed selection’) and possibly even the reinstatement of selective agents not encountered for many generations (‘reversed selection’). We examined the outcome of relaxed and reversed selection in the adaptive radiation of the threespine stickleback fish, Gasterostues aculeatus...
Bats use echolocation calls that are suited for foraging in particular habitats. Many generalist bats alter their call design patterns as they move between open and spatially complex areas. This plasticity probably allows them to respond to the perceptual challenges posed by different structural environments. I tested the hypothesis that bats learn to produce these habitat-specific calls. I recorded...
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