Migration history and stock structure of two putatively diadromous teleost fishes, as determined by genetic and otolith chemistry analyses

Daniel Schmidt, David Crook, Jed Macdonald, Joel Huey, Brenton Zampatti, Stuart Chilcott, Tarmo Raadik, Jane Hughes

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    Abstract

    Migratory life cycles and population structure of 2 putatively diadromous Australian fishes were examined using otolith chemistry (87Sr/ 86Sr) and genetics (microsatellites and mitochondrial deoxyribonucleic acid [mtDNA]). Australian whitebait (Lovettia sealii) is widely considered to be one of only a few anadromous fish species in the southern hemisphere. The congolli or tupong (Pseudaphritis urvillii) is reported to undertake an unusual form of sexually segregated catadromous migration, where females switch habitats between marine and freshwater, while males remain in marine or estuarine environments. Sr-isotope profiles of L. sealii showed this species does not move into fully freshwater habitats during its life cycle, suggesting it should be considered semianadromous or estuarine-dependent, rather than truly anadromous. This life-history strategy is unique among the Galaxiidae. Lovettia sealii is regionally divided into at least 3 well differentiated genetic stocks: northern and southern Tasmanian coasts and mainland Australia. Sr-isotope profiles of P. urvillii showed that females are catadromous, with the early life history spent in the marine environment and a single migratory transition from marine to freshwater occurring at an early point in the life history. Lack of bidirectional adult migration between freshwater and the sea suggests that female P. urvillii are semelparous, returning to the marine habitat to mate with resident males after an extended period of freshwater residence. Pseudaphritis exhibit weak genetic structure across their mainland range. An isolation-by-distance relationship describes the genetic structure of this species, a pattern it shares with several other nearshore-restricted catadromous fishes.
    Original languageEnglish
    Pages (from-to)193-206
    Number of pages14
    JournalFreshwater Science
    Volume33
    Issue number1
    DOIs
    Publication statusPublished - Mar 2014

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    diadromous fish
    otolith
    teleost
    otoliths
    chemistry
    history
    fish
    life history
    genetic structure
    marine environment
    life cycle (organisms)
    isotopes
    catadromous fish
    habitat
    life cycle
    habitats
    Galaxiidae
    isotope
    anadromous fish
    estuarine environment

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    Schmidt, Daniel ; Crook, David ; Macdonald, Jed ; Huey, Joel ; Zampatti, Brenton ; Chilcott, Stuart ; Raadik, Tarmo ; Hughes, Jane. / Migration history and stock structure of two putatively diadromous teleost fishes, as determined by genetic and otolith chemistry analyses. In: Freshwater Science. 2014 ; Vol. 33, No. 1. pp. 193-206.
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    abstract = "Migratory life cycles and population structure of 2 putatively diadromous Australian fishes were examined using otolith chemistry (87Sr/ 86Sr) and genetics (microsatellites and mitochondrial deoxyribonucleic acid [mtDNA]). Australian whitebait (Lovettia sealii) is widely considered to be one of only a few anadromous fish species in the southern hemisphere. The congolli or tupong (Pseudaphritis urvillii) is reported to undertake an unusual form of sexually segregated catadromous migration, where females switch habitats between marine and freshwater, while males remain in marine or estuarine environments. Sr-isotope profiles of L. sealii showed this species does not move into fully freshwater habitats during its life cycle, suggesting it should be considered semianadromous or estuarine-dependent, rather than truly anadromous. This life-history strategy is unique among the Galaxiidae. Lovettia sealii is regionally divided into at least 3 well differentiated genetic stocks: northern and southern Tasmanian coasts and mainland Australia. Sr-isotope profiles of P. urvillii showed that females are catadromous, with the early life history spent in the marine environment and a single migratory transition from marine to freshwater occurring at an early point in the life history. Lack of bidirectional adult migration between freshwater and the sea suggests that female P. urvillii are semelparous, returning to the marine habitat to mate with resident males after an extended period of freshwater residence. Pseudaphritis exhibit weak genetic structure across their mainland range. An isolation-by-distance relationship describes the genetic structure of this species, a pattern it shares with several other nearshore-restricted catadromous fishes.",
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    Migration history and stock structure of two putatively diadromous teleost fishes, as determined by genetic and otolith chemistry analyses. / Schmidt, Daniel; Crook, David; Macdonald, Jed; Huey, Joel; Zampatti, Brenton; Chilcott, Stuart; Raadik, Tarmo; Hughes, Jane.

    In: Freshwater Science, Vol. 33, No. 1, 03.2014, p. 193-206.

    Research output: Contribution to journalArticleResearchpeer-review

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    T1 - Migration history and stock structure of two putatively diadromous teleost fishes, as determined by genetic and otolith chemistry analyses

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    AB - Migratory life cycles and population structure of 2 putatively diadromous Australian fishes were examined using otolith chemistry (87Sr/ 86Sr) and genetics (microsatellites and mitochondrial deoxyribonucleic acid [mtDNA]). Australian whitebait (Lovettia sealii) is widely considered to be one of only a few anadromous fish species in the southern hemisphere. The congolli or tupong (Pseudaphritis urvillii) is reported to undertake an unusual form of sexually segregated catadromous migration, where females switch habitats between marine and freshwater, while males remain in marine or estuarine environments. Sr-isotope profiles of L. sealii showed this species does not move into fully freshwater habitats during its life cycle, suggesting it should be considered semianadromous or estuarine-dependent, rather than truly anadromous. This life-history strategy is unique among the Galaxiidae. Lovettia sealii is regionally divided into at least 3 well differentiated genetic stocks: northern and southern Tasmanian coasts and mainland Australia. Sr-isotope profiles of P. urvillii showed that females are catadromous, with the early life history spent in the marine environment and a single migratory transition from marine to freshwater occurring at an early point in the life history. Lack of bidirectional adult migration between freshwater and the sea suggests that female P. urvillii are semelparous, returning to the marine habitat to mate with resident males after an extended period of freshwater residence. Pseudaphritis exhibit weak genetic structure across their mainland range. An isolation-by-distance relationship describes the genetic structure of this species, a pattern it shares with several other nearshore-restricted catadromous fishes.

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    KW - isolated population

    KW - life cycle

    KW - life history trait

    KW - mitochondrial DNA

    KW - otolith

    KW - population structure

    KW - strontium isotope

    KW - teleost

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