Functional traits reveal the expansion and packing of ecological niche space underlying an elevational diversity gradient in passerine birds.

Abstract excerpt

Variation in species richness across environmental gradients may be associated with an expanded volume or increased packing of ecological niche space. However, the relative importance of these alternative scenarios remains unknown, largely because standardized information on functional traits and their ecological relevance is lacking for major diversity gradients. Here, we combine data on morphological and...

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