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Disruptive selection in a bimodal population of Darwin's finches

Hendry, Andrew P ; Huber, Sarah K ; De León, Luis F ; Herrel, Anthony ; Podos, Jeffrey

Proceedings. Biological sciences, 22 February 2009, Vol.276(1657), pp.753-9 [Periódico revisado por pares]

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  • Título:
    Disruptive selection in a bimodal population of Darwin's finches
  • Autor: Hendry, Andrew P ; Huber, Sarah K ; De León, Luis F ; Herrel, Anthony ; Podos, Jeffrey
  • Assuntos: Selection, Genetic ; Sexual Behavior, Animal ; Finches -- Physiology
  • É parte de: Proceedings. Biological sciences, 22 February 2009, Vol.276(1657), pp.753-9
  • Descrição: A key part of the ecological theory of adaptive radiation is disruptive selection during periods of sympatry. Some insight into this process might be gained by studying populations that are bimodal for dual-context traits, i.e. those showing adaptive divergence and also contributing to reproductive isolation. A population meeting these criteria is the medium ground finch (Geospiza fortis) of El Garrapatero, Santa Cruz Island, Galápagos. We examined patterns of selection in this population by relating individual beak sizes to interannual recaptures during a prolonged drought. Supporting the theory, disruptive selection was strong between the two beak size modes. We also found some evidence of selection against individuals with the largest and smallest beak sizes, perhaps owing to competition with other species or to gaps in the underlying resource distribution. Selection may thus simultaneously maintain the current bimodality while also constraining further divergence. Spatial and temporal...
  • Idioma: Inglês

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