Genetic variation in the rock lobsters jasus edwardsii and jasus novaehollandiae

  • Smith P
  • McKoy J
  • Machin P
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Abstract

Twenty-one proteins encoded by 33 scoreable generic loci were surveyed in 3 samples of J. edwardsii from New Zealand and in 1 sample of J. novaehollandiae from Tasmania. Only 1 polymorphic locus, Est-1 , was found in J. edwardsii and 2 polymorphic loci, Est-1 and Ldh , in J. novaehollandiae. Est-1 allele frequencies in J. edwardsii were similar in the 3 geographically isolated samples. Together with the biological data this suggests that J. edwardsii forms one stock. J. novaehollandiae differed from J. edwardsii only in allele frequencies of the Ldh locus. From Nei's measure, a genetic distance of 0.003 was found between the 2 species. This small genetic distance and the minor morphological differences suggest that they are conspecific populations. A more extensive biochemical and morphological survey of the 2 lobsters is required to determine their specific status. Low levels of genetic variation were found in J. edwardsii , heterozygosities 1.2-1.7%, and J. novaehollandiae , heterozygosity 2.8%. Within the Crustacea, decapods in general have low heterozygosities but high levels have been found in euphausiids. It is suggested that this is related to life cycle heterogeneity which might be an important factor in determining genetic variation

Author-supplied keywords

  • Electrophoresis
  • Enzyme polymorphisms
  • Genetic variation
  • Jasus edwardsii
  • Jasus novaehollandiae

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Authors

  • P. J. Smith

  • J. L. McKoy

  • P. J. Machin

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