Faculdade de Ciências Biológicas - FBIO/IECOS

URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/2253

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Acesso aberto (Open Access)
Significant genetic differentiation among populations of Anomalocardia brasiliana (Gmelin, 1791): a bivalve with planktonic larval dispersion
(2009) ARRUDA, Cinthya Cristina Bulhões; BEASLEY, Colin Robert; SOUZA, Marcelo Nazareno Vallinoto de; SILVA, Nelane do Socorro Marques da; TAGLIARO, Claudia Helena
Four Brazilian populations of Anomalocardia brasiliana were tested for mutual genetic homogeneity, using data from 123 sequences of the mtDNA cytochrome oxidase c subunit I gene. A total of 36 haplotypes were identified, those shared being H3 (Canela Island, Prainha and Acupe) and both H5 and H9 (Prainha and Acupe). Haplotype diversity values were high, except for the Camurupim population, whereas nucleotide values were low in all the populations, except for that of Acupe. Only the Prainha population showed a deviation from neutrality and the SSD test did not reject the demographic expansion hypothesis. Fst values showed that the Prainha and Acupe populations represent a single stock, whereas in both the Canela Island and Camurupim stocks, population structures are different and independent. The observed structure at Canela Island may be due to the geographic distance between this population and the remainder. The Camurupim population does not share any haplotype with the remaining populations in northeastern Brazil. The apparent isolation could be due to the rocky barrier located facing the mouth of the Mamanguape River. The results highlight the importance of wide-scale studies to identify and conserve local genetic diversity, especially where migration is restricted.
Acesso aberto (Open Access)
Taxonomic implications of molecular studies on Northern Brazilian Teredinidae (Mollusca: Bivalvia) specimens
(2005-03) VALE, Sonia Maria Lima Santos do; TAGLIARO, Claudia Helena; BEASLEY, Colin Robert; SCHNEIDER, Horacio; SAMPAIO, Maria Iracilda da Cunha; SANTOS FILHO, Carlos; MÜLLER, Ana Cláudia de Paula
The current taxonomy of the Teredinidae (shipworms) is wholly based on morphology and up to now no molecular studies of the phylogeny of this group have been published. In the present study the relationships between four genera of the subfamilies Teredininae and Bankiinae were established and the efficiency of the 16S rRNA gene in characterizing four Teredinidae species was tested. Phylogenetic trees support the grouping of Bankia fimbriatula with Nausitora fusticula and of Neoteredo reynei with Psiloteredo healdi, but the genetic distances do not justify the classification of these species into two distinct subfamilies. The results show that B. fimbriatula, N. reynei and P. healdi specimens from the coast of the Brazilian state of Pará have five distinct 16S rRNA haplotypes, with one N. reynei haplotype differing from the other haplotypes in respect to at least seven sequences sites, indicating the existence of two very distinct sympatric lineages.

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Navegando Faculdade de Ciências Biológicas - FBIO/IECOS por Assunto "Bivalve (Molusco)"