Conformity to Bergmann’s rule in birds depends on nest design and migration

Mark Mainwaring & Sally Street
Ecogeographical rules attempt to explain large-scale spatial patterns in biological traits. One of the most enduring examples is Bergmann’s rule, which states that species should be larger in colder climates due to the thermoregulatory advantages of larger body size. Support for Bergmann’s rule, however, is not consistent across taxonomic groups, raising questions about what factors may moderate its effect. Behaviour may play a crucial, yet so far underexplored, role in mediating the extent to which...
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