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Genetic differentiation among populations of a broadcast spawning soft coral, Sinularia flexibilis, on the Great Barrier Reef

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dc.contributor James Cook Univ N Queensland
dc.contributor Australian Inst Marine Sci
dc.contributor James Cook University
dc.contributor Australian Institute Of Marine Science
dc.contributor Australian Institute Of Marine Science (aims) en FABRICIUS, KE BASTIDAS, C BENZIE, JAH UTHICKE, S 2013-02-28T06:46:47Z 2017-03-21T01:11:18Z 2013-02-28T06:46:47Z 2020-09-02T03:57:44Z 2017-03-21T01:11:18Z 2013-02-28T06:46:47Z 2017-03-21T01:11:18Z 2020-09-02T03:57:44Z 2001-03-01
dc.identifier 5816 en
dc.identifier.citation Bastidas C, Benzie JAH, Uthicke S and Fabricius KE (2001) Genetic differentiation among populations of a broadcast spawning soft coral, Sinularia flexibilis, on the Great Barrier Reef. Marine Biology. 138: 517-525. en
dc.identifier.issn 0025-3162
dc.description Link to abstract/full text - en
dc.description.abstract The genetic structure of 12 reef populations of the soft coral Sinularia flexibilis (Octocorallia, Alcyoniidae) was studied along the Great Barrier Reef (GBR) at a maximum separation of 1,300 km to investigate the relative importance of sexual and asexual reproduction, genetic differentiation and gene flow among these populations. S. flexibilis is a widely distributed Indo-Pacific species and a gamete broadcaster that can form large aggregations of colonies on near-shore reefs of the GBR. Up to 60 individuals per reef were collected at a minimum sampling scale of 5 m at two sites per reef, from December 1998 to February 2000. Electrophoretic analyses of nine polymorphic allozymes indicated that genotypic frequencies in most populations and loci did not differ significantly from those expected from Hardy-Weinberg predictions. Analysis of multi-locus genotypes indicated a high number of unique genotypes (N-go) relative to the number of individuals sampled (N) in each reef population (range of 0.69-0.95). The maximum number of individuals likely to have been produced sexually (N*) was similar to the number of individuals sampled (i.e. N*:N similar to1), suggesting that even repeated genotypes may have been produced sexually. These results demonstrated a dominant role of sexual reproduction in these populations at the scale sampled. Significant genetic differentiation between some populations indicated that gene how is restricted between some reefs (F-ST = 0.026, 95% 0.011 - 0.045) and even between sites within reefs (F-ST = 0.041, 95% CI = 0.027 - 0.055). Nevertheless, there was no relationship between geographic separation and genetic differentiation. Analyses comparing groups of populations showed no significant differentiation on a north-south gradient in the GBR. The pattern in the number of significant differences in gene frequencies in pairwise population comparisons, however, suggested that gene flow may be more restricted among inner-shelf reef populations near to the coast than among mid/ outer-shelf populations further from the coast.
dc.description.uri en
dc.language English
dc.language en en
dc.publisher Springer-Verlag en
dc.relation.ispartof Marine Biology - pages: 138: 517-525 en
dc.relation.ispartof Null
dc.relation.uri en
dc.relation.uri en
dc.subject Pocillopora-damicornis
dc.subject Marine & Freshwater Biology
dc.subject Gorgonian Coral
dc.subject Recruitment
dc.subject Australia
dc.subject Anemone Actinia-tenebrosa
dc.subject Flow
dc.subject Sea
dc.subject Reproduction
dc.subject Acanthaster-planci
dc.subject Larval Dispersal
dc.title Genetic differentiation among populations of a broadcast spawning soft coral, Sinularia flexibilis, on the Great Barrier Reef
dc.type journal article en
dc.identifier.doi 10.1007/s002270000480 en
dc.identifier.wos WOS:000167838300008

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