Genetic variation among insular populations of the sleepy lizard Trachydosaurus rugosus Gray (Squamata: Scincidae)

Stephen SARRE, Terry Schwaner, Arthur GEORGES

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    17 Citations (Scopus)

    Abstract

    Seven island populations of the sleepy lizard, Trachydosaurus rugosus, in South Australia were studied to establish the genetic effects of isolation. These effects were assessed by comparing genetic characteristics (using allozyme electrophoresis) of the island populations with those of three adjacent mainland populations. Heterozygosity levels did not vary significantly among the populations although the island populations exhibited reduced allelic diversity. Alleles that were rare on the mainland were not present in the island populations. Genetic divergence among the island populations was much greater than among populations on the mainland, reinforcing the notion that evolutionary forces, probably genetic drift, were greatest among the insular populations. This study demonstrates that the intra-specific component of variation can be significant, and that the importance of this component will increase with the fragmentation and isolation of populations. This finding serves to emphasise the importance of considering the population as the unit of conservation.
    Original languageEnglish
    Pages (from-to)603-616
    JournalAustralian Journal of Zoology
    Volume38
    Publication statusPublished - 1990

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    Scincidae
    Squamata
    lizard
    lizards
    genetic variation
    genetic drift
    allozyme
    heterozygosity
    electrokinesis
    allele
    fragmentation
    divergence
    South Australia
    allozymes
    electrophoresis
    alleles

    Cite this

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    title = "Genetic variation among insular populations of the sleepy lizard Trachydosaurus rugosus Gray (Squamata: Scincidae)",
    abstract = "Seven island populations of the sleepy lizard, Trachydosaurus rugosus, in South Australia were studied to establish the genetic effects of isolation. These effects were assessed by comparing genetic characteristics (using allozyme electrophoresis) of the island populations with those of three adjacent mainland populations. Heterozygosity levels did not vary significantly among the populations although the island populations exhibited reduced allelic diversity. Alleles that were rare on the mainland were not present in the island populations. Genetic divergence among the island populations was much greater than among populations on the mainland, reinforcing the notion that evolutionary forces, probably genetic drift, were greatest among the insular populations. This study demonstrates that the intra-specific component of variation can be significant, and that the importance of this component will increase with the fragmentation and isolation of populations. This finding serves to emphasise the importance of considering the population as the unit of conservation.",
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    pages = "603--616",
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    TY - JOUR

    T1 - Genetic variation among insular populations of the sleepy lizard Trachydosaurus rugosus Gray (Squamata: Scincidae)

    AU - SARRE, Stephen

    AU - Schwaner, Terry

    AU - GEORGES, Arthur

    PY - 1990

    Y1 - 1990

    N2 - Seven island populations of the sleepy lizard, Trachydosaurus rugosus, in South Australia were studied to establish the genetic effects of isolation. These effects were assessed by comparing genetic characteristics (using allozyme electrophoresis) of the island populations with those of three adjacent mainland populations. Heterozygosity levels did not vary significantly among the populations although the island populations exhibited reduced allelic diversity. Alleles that were rare on the mainland were not present in the island populations. Genetic divergence among the island populations was much greater than among populations on the mainland, reinforcing the notion that evolutionary forces, probably genetic drift, were greatest among the insular populations. This study demonstrates that the intra-specific component of variation can be significant, and that the importance of this component will increase with the fragmentation and isolation of populations. This finding serves to emphasise the importance of considering the population as the unit of conservation.

    AB - Seven island populations of the sleepy lizard, Trachydosaurus rugosus, in South Australia were studied to establish the genetic effects of isolation. These effects were assessed by comparing genetic characteristics (using allozyme electrophoresis) of the island populations with those of three adjacent mainland populations. Heterozygosity levels did not vary significantly among the populations although the island populations exhibited reduced allelic diversity. Alleles that were rare on the mainland were not present in the island populations. Genetic divergence among the island populations was much greater than among populations on the mainland, reinforcing the notion that evolutionary forces, probably genetic drift, were greatest among the insular populations. This study demonstrates that the intra-specific component of variation can be significant, and that the importance of this component will increase with the fragmentation and isolation of populations. This finding serves to emphasise the importance of considering the population as the unit of conservation.

    M3 - Article

    VL - 38

    SP - 603

    EP - 616

    JO - Australian Journal of Zoology

    JF - Australian Journal of Zoology

    SN - 0004-959X

    ER -