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    A continent-scale test of multiple hypotheses on the abundances of Neotropical birds

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    Author
    Kikuchi, David W
    Kattan, Gustavo H
    Navarro Velez, Kimberly C
    Affiliation
    Univ Arizona, Dept Ecol & Evolutionary Biol
    Issue Date
    2019-01
    Keywords
    bird abundance
    energy limitation
    species interaction
    Andes
    Amazon
    density compensation
    
    Metadata
    Show full item record
    Publisher
    WILEY
    Citation
    Kikuchi, D. W., Kattan, G. H., & Navarro Vélez, K. C. (2018). A continent‐scale test of multiple hypotheses on the abundances of Neotropical birds. Oikos.
    Journal
    OIKOS
    Rights
    © 2018 The Authors. Oikos © 2018 Nordic Society Oikos
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Explaining variation in the abundance of species remains a challenge in ecology. We sought to explain variation in abundance of Neotropical forest birds using a dataset of population densities of 596 species. We tested a priori hypotheses for the roles of species traits, environmental factors, and species interactions. Specifically, we focused on four factors: 1) body mass (trait), 2) habitat type (environmental factor), 3) net primary productivity (NPP; environmental factor) and 4) species richness of competitors (species interaction). Body size explained much variation in density, although only when analyzed at higher taxonomic levels. Habitat type was a strong predictor of density. The relationship between density and productivity was weak. Densities were related negatively to the species richness of heterospecifics. This trend was particularly strong within closely related groups. Our results show that the influence of energetic factors such as body size and productivity depends on phylogeny, and that they act through indirect relations with other variables; alternative ecological factors such as habitat structure and species interactions play a more direct and stronger role in determining abundance than previously thought.
    Note
    12 month embargo; first published: 22 August 2018
    Version
    Final accepted manuscript
    Sponsors
    [NIH-2K12GM000708-18]
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    UA Faculty Publications

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