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    Early Sibling Conflict May Ultimately Benefit the Family

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    Author
    Smith, Alyssa Laney
    Atwater, Daniel Z
    Callaway, Ragan M
    Affiliation
    Univ Arizona, Dept Ecol & Evolutionary Biol
    Issue Date
    2019-04-14
    Keywords
    asymmetry
    competition
    cooperation
    exotic invasive
    intraspecific variation
    kin selection
    plant-plant interactions
    
    Metadata
    Show full item record
    Publisher
    UNIV CHICAGO PRESS
    Citation
    Alyssa Laney Smith, Daniel Z. Atwater, and Ragan M. Callaway, "Early Sibling Conflict May Ultimately Benefit the Family," The American Naturalist 194, no. 4 (October 2019): 482-487.
    Journal
    AMERICAN NATURALIST
    Rights
    Copyright © 2019 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
    Relatives often interact differently with each other than with nonrelatives, and whether kin cooperate or compete has important consequences for the evolution of mating systems, seed size, dispersal, and competition. Previous research found that the larger of the size dimorphic seeds produced by the annual plant Aegilops triuncialis suppressed germination of their smaller sibs by 25%-60%. Here, we found evidence for kin recognition and sibling rivalry later in life among Aegilops seedlings that places seed-seed interactions in a broader context. In experiments with size dimorphic seeds, seedlings reduced the growth of sibling seedlings by ∼40% but that of nonsibling seedlings by ∼25%. These sequential antagonistic interactions between seeds and then seedlings provide insight into conflict and cooperation among kin. Kin-based conflict among seeds may maintain dormancy for some seeds until the coast is clear of more competitive siblings. If so, biotically induced seed dormancy may be a unique form of cooperation, which increases the inclusive fitness of maternal plants and offspring by minimizing competition among kin.
    Note
    12 month embargo; published online: 14 August 2019
    ISSN
    0003-0147
    PubMed ID
    31490727
    DOI
    10.1086/704773
    Version
    Final published version
    Sponsors
    National Science Foundation (NSF)National Science Foundation (NSF) [OIA-1757351]; NSFNational Science Foundation (NSF) [DGE-1143953]
    ae974a485f413a2113503eed53cd6c53
    10.1086/704773
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