|Genetic structure and phylogeography of the common goby, Pomatoschistus microps (Krøyer, 1938), throughout its distributional range|
Gysels, E.S.; Hellemans, B.; Pampoulie, C.; Volckaert, F.A.M.J. (2003). Genetic structure and phylogeography of the common goby, Pomatoschistus microps (Krøyer, 1938), throughout its distributional range, in: Gysels, E.S. Genetische structuur en evolutieve patronen van Pomatoschistus grondels op het Europees Continentaal Plat en in de Middellandse Zee = Genetic structure and evolutionary patterns in Pomatoschistus gobies on the European Continental Shelf and in the Mediterranean Sea. pp. 73-101
In: Gysels, E.S. (2003). Genetische structuur en evolutieve patronen van Pomatoschistus grondels op het Europees Continentaal Plat en in de Middellandse Zee = Genetic structure and evolutionary patterns in Pomatoschistus gobies on the European Continental Shelf and in the Mediterranean Sea. PhD Thesis. Katholieke Universiteit Leuven (KUL): Leuven. 206 pp., more
Genetics; Pomatoschistus microps (Krøyer, 1838) [WoRMS]; Marine
The phylogeographic patterns of a small marine fish, the common goby, Pomatoschistus microps (Kroyer 1838), were assessed along the northeastern Atlantic coasts. A combination of two genetic markers was employed: cellulose acetate allozyme electrophoresis (CAGE) and sequence analysis of a 289 bp fragment of the mitochondrial locus cytochrome b. Twelve coastal sites were sampled, ranging from central Norway and the British Isles to Portugal and the Western Mediterranean Sea. Both markers were congruent in revealing significant differences between most populations and a pattern of isolation-by-distance along the European coasts. Phylogeographic analyses yielded a shallow branching structure with four groups; three were confined to the Atlantic basin and showed a starlike pattern, which may be due to either a relatively recent (postglacial) population expansion after a bottleneck or a founder event. The fourth group contained a central haplotype occurring at the edges of the species' distribution (resp. the Norwegian and Mediterranean Sea) accompanied by a few rarer variants, which were restricted to the Mediterranean Sea. A genetic break was observed around the British lsles, with distinct haplotypes dominating at either side of the English Channel. Gene flow analysis suggested that recolonisation of the North Sea and the coasts of western Scotland and Ireland may have taken place from a glacial refugium the Southern Bight of the North Sea. Alternatively, the present distribution of the haplotypes, which corresponds to a Lusitanian/Boreal distribution, may be influenced by temperature-dependent selection. A significantly negative correlation between the degree of genetic diversity and latitude was recorded both for mtDNA and allozymes in the Atlantic basin. Historical factors such as founder effects during recolonisation of formerly glaciated areas are probably responsible for the loss of genetic variation at higher latitudes in the northeastern Atlantic Ocean.
- Population structure and dispersal in the North Sea of Pomatoschistus gobies, more