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    Ecological Opportunity In Adaptive Radiation Of Galapagos Endemic Land Snails

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    EcologicalOpportunityAdaptiveRadiation.pdf (635.0Kb)
    Date
    2009-12
    Author
    Parent, Christine E.
    Crespi, Bernard J.
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    Abstract
    The classic evolutionary hypothesis of ecological opportunity proposes that both heterogeneity of resources and freedom from enemies promote phenotypic divergence as a response to increased niche availability. Although phenotypic divergence and speciation have often been inferred to be the primary consequences of the release from competition or predation that accompanies a shift to a new adaptive zone, increased phenotypic variation within species is expected to represent the first stage resulting from such a shift. Using measures of intraspecific morphological variation of 30 species of Galapagos endemic land snails in a phylogenetically controlled framework, we show that the number of local congeners and the number of local plant species are associated with lower and higher intraspecific phenotypic variation, respectively. In this clade, ecological opportunity thus explicitly links the role of competition from congeners and the heterogeneity of resources to the extent of intraspecific phenotypic divergence as adaptive radiation proceeds.
    Department
    Integrative Biology
    Subject
    adaptation
    diversification
    ecological release
    intraspecific
    variation
    shell morphology
    thais-emarginata prosobranchia
    shell-shape variation
    character
    displacement
    interspecific competition
    littorina-saxatilis
    nucella-lapillus
    bembicium-vittatum
    intertidal snail
    bonin islands
    selection
    ecology
    evolutionary biology
    URI
    http://hdl.handle.net/2152/31242
    Citation
    Christine E. Parent and Bernard J. Crespi. Ecological Opportunity In Adaptive Radiation Of Galapagos Endemic Land Snails. The American Naturalist, Vol. 174, No. 6 (Dec., 2009), pp. 898-905. DOI: 10.1086/646604
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    • facebook
    • twitter
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    • CONTACT US
    • MAPS & DIRECTIONS
    • JOB OPPORTUNITIES
    • UT Austin Home
    • Emergency Information
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    • Web Accessibility Policy
    • Web Privacy Policy
    • Adobe Reader
    Subscribe to our NewsletterGive to the Libraries

    © The University of Texas at Austin