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    Scale-Dependent Community Theory for Streams and Other Linear Habitats.

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    Author
    Holt, Galen
    Chesson, Peter
    Affiliation
    Univ Arizona, Dept Ecol & Evolutionary Biol
    Issue Date
    2016-09
    Keywords
    coexistence
    spatial storage effect
    fitness-density covariance
    environmental and dispersal scale
    stream communities
    directional dispersal
    
    Metadata
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    Publisher
    UNIV CHICAGO PRESS
    Citation
    Scale-Dependent Community Theory for Streams and Other Linear Habitats. 2016, 188 (3):E59-73 Am. Nat.
    Journal
    The American naturalist
    Rights
    © 2016 by The University of Chicago. All rights reserved.
    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
    The maintenance of species diversity occurs at the regional scale but depends on interacting processes at the full range of lower scales. Although there is a long history of study of regional diversity as an emergent property, analyses of fully multiscale dynamics are rare. Here, we use scale transition theory for a quantitative analysis of multiscale diversity maintenance with continuous scales of dispersal and environmental variation in space and time. We develop our analysis with a model of a linear habitat, applicable to streams or coastlines, to provide a theoretical foundation for the long-standing interest in environmental variation and dispersal, including downstream drift. We find that the strength of regional coexistence is strongest when local densities and local environmental conditions are strongly correlated. Increasing dispersal and shortening environmental correlations weaken the strength of coexistence regionally and shift the dominant coexistence mechanism from fitness-density covariance to the spatial storage effect, while increasing local diversity. Analysis of the physical and biological determinants of these mechanisms improves understanding of traditional concepts of environmental filters, mass effects, and species sorting. Our results highlight the limitations of the binary distinction between local communities and a species pool and emphasize species coexistence as a problem of multiple scales in space and time.
    Note
    Electronically published July 8, 2016. 12 month embargo.
    ISSN
    1537-5323
    PubMed ID
    27501093
    DOI
    10.1086/687525
    Version
    Final published version
    Sponsors
    National Science Foundation (NSF) [DEB-1119784]; NSF Graduate Research Fellowship
    Additional Links
    http://www.journals.uchicago.edu/doi/10.1086/687525
    ae974a485f413a2113503eed53cd6c53
    10.1086/687525
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