Genetic variance in Ophiomusium lymani (Ophiuroidea: Echinodermata) from lower bathyal depths in the Rocklall Trough (northeast Atlantic) |
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| Authors: | R T Hensley J A Beardmore P A Tyler |
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| Institution: | (1) School of Biological Sciences, University College of Swansea, Singleton Park, SA2 8PP Swansea, South Wales, UK;(2) Present address: Aquatic Sciences Research Division, Department of Agriculture for Northern Ireland, Newforge Lane, BT9 5PX Belfast, Northern Ireland;(3) Present address: Department of Oceanography, The University, Highfield, SO9 5NH Southampton, England |
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| Abstract: | Specimens of the deep-sea brittle-star Ophiomusium lymani were collected from six sites in the Rockall Trough (northeast Atlantic_. Four monomorphic and four polymorphic loci were detected, with up to 75 individuals screened at any one locus. The results showed little difference in allele frequencies between sites and, consequently, estimates of genetic identity indicated no significant genetic differentiation between the populations sampled. Deficits of heterozygotes were observed at all polymorphic loci, but the deficiencies were only significant at the phosphoglucose isomerase locus from two locations. The deficit of heterozygotes was not the same across loci, suggesting that inbreeding is not the cause of the excess homozygosity. No relationship between heterozygosity and depth was observed. |
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