Low interbasin connectivity in a facultatively diadromous fish

evidence from genetics and otolith chemistry

Jane Hughes, Daniel Schmidt, Jed Macdonald, Joel Huey, David Crook

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    Southern smelts (Retropinna spp.) in coastal rivers of Australia are facultatively diadromous, with populations potentially containing individuals with diadromous or wholly freshwater life histories. The presence of diadromous individuals is expected to reduce genetic structuring between river basins due to larval dispersal via the sea. We use otolith chemistry to distinguish between diadromous and nondiadromous life histories and population genetics to examine interbasin connectivity resulting from diadromy. Otolith strontium isotope (87Sr:86Sr) transects identified three main life history patterns: amphidromy, freshwater residency and estuarine/marine residency. Despite the potential for interbasin connectivity via larval mixing in the marine environment, we found unprecedented levels of genetic structure for an amphidromous species. Strong hierarchical structure along putative taxonomic boundaries was detected, along with highly structured populations within groups using microsatellites (FST = 0.046-0.181), and mtDNA (?ST = 0.498-0.816). The presence of strong genetic subdivision, despite the fact that many individuals reside in saline water during their early life history, appears incongruous. However, analysis of multielemental signatures in the otolith cores of diadromous fish revealed strong discrimination between river basins, suggesting that diadromous fish spend their early lives within chemically distinct estuaries rather than the more homogenous marine environment, thus avoiding dispersal and maintaining genetic structure. 
    Original languageEnglish
    Pages (from-to)1000-1013
    Number of pages14
    JournalMolecular Ecology
    Volume23
    Issue number5
    DOIs
    Publication statusPublished - Mar 2014

    Fingerprint

    diadromous fish
    Otolithic Membrane
    otolith
    otoliths
    connectivity
    Fishes
    chemistry
    life history
    Rivers
    Genetic Structures
    Internship and Residency
    fish
    Fresh Water
    marine environment
    genetic structure
    Strontium Isotopes
    diadromy
    Osmeriformes
    river basin
    Osmeridae

    Cite this

    Hughes, Jane ; Schmidt, Daniel ; Macdonald, Jed ; Huey, Joel ; Crook, David. / Low interbasin connectivity in a facultatively diadromous fish : evidence from genetics and otolith chemistry. In: Molecular Ecology. 2014 ; Vol. 23, No. 5. pp. 1000-1013.
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    abstract = "Southern smelts (Retropinna spp.) in coastal rivers of Australia are facultatively diadromous, with populations potentially containing individuals with diadromous or wholly freshwater life histories. The presence of diadromous individuals is expected to reduce genetic structuring between river basins due to larval dispersal via the sea. We use otolith chemistry to distinguish between diadromous and nondiadromous life histories and population genetics to examine interbasin connectivity resulting from diadromy. Otolith strontium isotope (87Sr:86Sr) transects identified three main life history patterns: amphidromy, freshwater residency and estuarine/marine residency. Despite the potential for interbasin connectivity via larval mixing in the marine environment, we found unprecedented levels of genetic structure for an amphidromous species. Strong hierarchical structure along putative taxonomic boundaries was detected, along with highly structured populations within groups using microsatellites (FST = 0.046-0.181), and mtDNA (?ST = 0.498-0.816). The presence of strong genetic subdivision, despite the fact that many individuals reside in saline water during their early life history, appears incongruous. However, analysis of multielemental signatures in the otolith cores of diadromous fish revealed strong discrimination between river basins, suggesting that diadromous fish spend their early lives within chemically distinct estuaries rather than the more homogenous marine environment, thus avoiding dispersal and maintaining genetic structure. ",
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    Low interbasin connectivity in a facultatively diadromous fish : evidence from genetics and otolith chemistry. / Hughes, Jane; Schmidt, Daniel; Macdonald, Jed; Huey, Joel; Crook, David.

    In: Molecular Ecology, Vol. 23, No. 5, 03.2014, p. 1000-1013.

    Research output: Contribution to journalArticleResearchpeer-review

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