Genetic differentiation among populations of the brooding soft coral Clavularia koellikeri on the Great Barrier Reef

Bastidas, C., Benzie, J.A.H., and Fabricius, K.E. (2002) Genetic differentiation among populations of the brooding soft coral Clavularia koellikeri on the Great Barrier Reef. Coral Reefs, 21 (3). pp. 233-241.

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Abstract

The contribution of sexual and asexual reproduction, the spatial patterns of genetic structure, and the potential gene flow among populations were determined for the soft coral Clavularia koellikeri (Octocorallia: Alcyonacea, Clavulariidae) at ten sites among six reefs from two well-separated regions of the Great Barrier Reef (GBR), Australia. Eight allozyme loci indicated that colonies of C. koellikeri separated ≥3 m were produced sexually. Genetic diversity was lower in the southern (18°S) compared with the northern (10°S) populations, suggesting that reefs closer to the southernmost limit of the distribution of C. koellikeri within the GBR (19°S) may represent a more marginal habitat for this species. High levels of genetic differentiation were significant at all spatial scales (sites within reefs, reefs, and regions) from <4 km up to 1,000 km, indicating that C. koellikeri has restricted dispersal, consistent with having brooded larvae.

Item ID: 27483
Item Type: Article (Research - C1)
ISSN: 1432-0975
Keywords: genetic differentiation; gene flow; mode of reproduction; aggregations; soft corals
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Date Deposited: 06 Jun 2013 04:32
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 100%
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