Data from: Tropical bird species have less variable body sizes

Quentin D. Read, Benjamin Baiser, John M. Grady, Phoebe L. Zarnetske, Sydne Record & Jonathan Belmaker
Ecologists have often predicted that species’ niche breadths should decline toward the equator. Dan Janzen arrived at this prediction based on climatic constraints, while Robert MacArthur argued that a latitudinal gradient in resource specialization drives the pattern. This idea has some support when it comes to thermal niches, but has rarely been explored for other niche dimensions. Body size is linked to niche dimensions related to diet, competition, and environmental tolerance in vertebrates. We identified...
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