Pattern and process in the distribution of North American freshwater fish

David Griffiths

    Research output: Contribution to journalArticle

    35 Citations (Scopus)

    Abstract

    Published species lists were analysed to determine the contributions of dispersal, habitat preference, river channel size, body size, and glacial history to large-scale patterns in freshwater fish species richness in North America, north of central Mexico. Total species richness declines to the north and west but the pattern for endemics differs from that of widespread species. Mississippi Basin regions are more species rich than more isolated, coastal, regions. Richness declines more rapidly with increasing latitude in riverine specialist than in habitat generalist species. Levels of endemism are greatest in species found in small- to medium-sized river channels. The strong Rapoport effect, more marked in migratory than resident species, is correlated with habitat preference, channel size, and glacial history. Body size increases with latitude, largely as a result of a trend from small resident to large migrant species. In unglaciated regions, ancestral species survived in large habitats because these are longer-lived, more extensive, less isolated and more stable than headwaters, permitting larger populations and lower extinction levels. Reduced levels of gene flow in small, peripheral, channels isolated by larger downstream habitats have resulted in the production of many, small range, small-bodied species. The latitudinal richness gradient is a consequence of speciation and extinction events in unglaciated faunas and an increasing domination of faunas by generalist, large bodied, large channel, recolonizing species in more northern regions. (C) 2010 The Linnean Society of London, Biological Journal of the Linnean Society, 2010, 100, 46-61.
    LanguageEnglish
    Pages46-61
    JournalBiological Journal of the Linnean Society
    Volume100
    Issue number1
    Publication statusPublished - May 2010

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    fish
    glacial history
    river channel
    generalist
    habitat selection
    body size
    habitat
    species richness
    extinction
    distribution
    fauna
    endemism
    headwater
    gene flow
    basin

    Cite this

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    title = "Pattern and process in the distribution of North American freshwater fish",
    abstract = "Published species lists were analysed to determine the contributions of dispersal, habitat preference, river channel size, body size, and glacial history to large-scale patterns in freshwater fish species richness in North America, north of central Mexico. Total species richness declines to the north and west but the pattern for endemics differs from that of widespread species. Mississippi Basin regions are more species rich than more isolated, coastal, regions. Richness declines more rapidly with increasing latitude in riverine specialist than in habitat generalist species. Levels of endemism are greatest in species found in small- to medium-sized river channels. The strong Rapoport effect, more marked in migratory than resident species, is correlated with habitat preference, channel size, and glacial history. Body size increases with latitude, largely as a result of a trend from small resident to large migrant species. In unglaciated regions, ancestral species survived in large habitats because these are longer-lived, more extensive, less isolated and more stable than headwaters, permitting larger populations and lower extinction levels. Reduced levels of gene flow in small, peripheral, channels isolated by larger downstream habitats have resulted in the production of many, small range, small-bodied species. The latitudinal richness gradient is a consequence of speciation and extinction events in unglaciated faunas and an increasing domination of faunas by generalist, large bodied, large channel, recolonizing species in more northern regions. (C) 2010 The Linnean Society of London, Biological Journal of the Linnean Society, 2010, 100, 46-61.",
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    Pattern and process in the distribution of North American freshwater fish. / Griffiths, David.

    In: Biological Journal of the Linnean Society, Vol. 100, No. 1, 05.2010, p. 46-61.

    Research output: Contribution to journalArticle

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