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|Title: ||Genetic variation and population structuring in two brooding coral species (Siderastrea stellata and Siderastrea radians) from Brazil|
|Other Titles: ||Genetica|
|Authors: ||Neves, Elizabeth Gerardo|
Andrade, Sónia Cristina da Silva
Silveira, Fábio Lang da
Solferini, Vera Nisaka
|Keywords: ||Brazilian reefs;Gene flow;Genotypic diversity;Population structure;Scleractinian corals;Siderastrea|
|Issue Date: ||2008|
|Abstract: ||Siderastrea stellata and S. radians are scleractinian coral species that present a remarkable overlap of diagnostic characteristics and sympatric distribution.
Moreover, both are viviparous with similar reproductive strategies and with a gregarious larval behavior. Samples of
both species from the Brazilian coast were analyzed using 18 isozymic loci to quantify their genetic variability and
populational structure. Results confirmed species identity, high intrapopulational variability and revealed moderate
genetic structuring among all samples (S. stellata: FST = 0.070; S. radians: FST = 0.092). Based on genotypic diversity analysis, there was evidence that local recruitment may have a minor role in the populations (mean, Go:Ge = 1.00 ± 0.0003 SD for S. stellata and 0.99 ± 0.0023 SD for S. radians). Deviations towards heterozygote
deficiencies found in both Siderastrea species could be explained by the Wahlund effect, since there was evidence that populations might be composed of colonies
of different ages. In S. radians it is also likely that there is some inbreeding occurring in the studied populations.
Despite the brooding pattern and the gregarious larval behavior, our data suggest the occurrence of gene flow along the Brazilian coast. This is the first study on population genetics of Brazilian reef corals.|
|Description: ||Acesso restrito: Texto completo. p. 243-254|
|Appears in Collections:||Artigos Publicados em Periódicos (Biologia)|
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