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Title: Genetic diversity and population structure of Solea solea and Solea senegalensis and its relationships with life history patterns
Author: Teixeira, Tatiana Fonseca de Araújo
Advisor: Coelho, Maria Manuela
Cabral, Henrique Nogueira
Keywords: Aquacultura
Teses de mestrado
Defense Date: 2007
Abstract: Soles (Solea spp.) are heavily exploited all round the world (fisheries and aquaculture) due to their high commercial value. Nonetheless, the knowledge on their biology and the exploitation status of their stocks is limited to certain geographical areas. A key issue to management is the population structure of fisheries resources. The aim of the present study is to determine the genetic diversity and population structure of Solea solea (Linnaeus, 1758), and Solea senegalensis, Kaup, 1858, throughout their distribution range and to evaluate its relationships with life history patterns. The genetic diversity and population structure of both species were analysed based on sequences of cytochrome b of mitochondrial DNA (about 1141 bp in length). A low nucleotide diversity (<0.005) and high haplotype diversity (h>0.600) was observed for both species (except for Portugal-North population of S. senegalensis, h=0.378). The pairwise 2-statistics and AMOVA for S. solea evidenced a high genetic divergence between Atlantic and Mediterranean populations and between the Eastern and Western areas of the Mediterranean. Significant differences were also observed between samples of S. senegalensis, with geographical distance per se assuming a very important role in structuring populations and presenting a strong association with genetic divergence amongst the set of samples analyzed. Minimum spanning network analyses, revealed star-shaped patterns for populations of both species, suggesting that populations had undergone Summary - x - expansion following bottlenecks. Atlantic populations of S. solea, ranging from the Baltic Sea to South Portugal could be considered as representative of the same panmictic unit, presenting high levels of gene flow. The higher levels of diversity observed in S. senegalensis compared to S. solea may be due to differences in the duration of the pelagic larval phase, spawning period and habitat use patterns, with water temperature assuming a major ro
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Description: Tese de mestrado em Biologia e Gestão dos Recursos Marinhos , apresentada à Universidade de Lisboa, através da Faculdadede Ciências, 2007
Appears in Collections:FC - Dissertações de Mestrado

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