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Small fish, large river: Surprisingly minimal genetic structure in a dispersal‐limited, habitat specialist fish

Washburn, Brooke A. ; Cashner, Mollie F. ; Blanton, Rebecca E.

Ecology and evolution, 2020-02, Vol.10 (4), p.2253-2268 [Periódico revisado por pares]

England: John Wiley & Sons, Inc

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  • Título:
    Small fish, large river: Surprisingly minimal genetic structure in a dispersal‐limited, habitat specialist fish
  • Autor: Washburn, Brooke A. ; Cashner, Mollie F. ; Blanton, Rebecca E.
  • Assuntos: Barriers ; Creeks & streams ; Dispersal ; dispersal‐limited ; Dispersion ; Fish ; Gene flow ; Genetic diversity ; Genetic structure ; Geographical distribution ; Habitats ; isolation‐by‐distance ; linear river system ; Microsatellites ; Original Research ; patchy habitat ; Population ; Rivers ; small spatial scale ; Specialization ; Species ; stepping‐stone dispersal
  • É parte de: Ecology and evolution, 2020-02, Vol.10 (4), p.2253-2268
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
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  • Descrição: Genetic connectivity is expected to be lower in species with limited dispersal ability and a high degree of habitat specialization (intrinsic factors). Also, gene flow is predicted to be limited by habitat conditions such as physical barriers and geographic distance (extrinsic factors). We investigated the effects of distance, intervening pools, and rapids on gene flow in a species, the Tuxedo Darter (Etheostoma lemniscatum), a habitat specialist that is presumed to be dispersal‐limited. We predicted that the interplay between these intrinsic and extrinsic factors would limit dispersal and lead to genetic structure even at the small spatial scale of the species range (a 38.6 km river reach). The simple linear distribution of E. lemniscatum allowed for an ideal test of how these factors acted on gene flow and allowed us to test expectations (e.g., isolation‐by‐distance) of linearly distributed species. Using 20 microsatellites from 163 individuals collected from 18 habitat patches, we observed low levels of genetic structure that were related to geographic distance and rapids, though these factors were not barriers to gene flow. Pools separating habitat patches did not contribute to any observed genetic structure. Overall, E. lemniscatum maintains gene flow across its range and is comprised of a single population. Due to the linear distribution of the species, a stepping‐stone model of dispersal best explains the maintenance of gene flow across its small range. In general, our observation of higher‐than‐expected connectivity likely stems from an adaptation to disperse due to temporally unstable and patchy habitat. We examine whether physical obstacles and geographic distance influence genetic structure in a presumably dispersal‐limited, habitat specialist riverine fish. We found minimal levels of genetic structure associated with rapids and distance. So, we conclude that there are minimal filters to gene flow in this endangered species and that higher‐than‐expected connectivity likely stems from an adaptation to disperse due to temporally unstable and patchy habitats.
  • Editor: England: John Wiley & Sons, Inc
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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