Present distribution and intraspecific diversity of marine species are shaped by ongoing geographical barriers, which drift different populations apart, as well as by past conditions such as temperature variations. Different intraspecific diversity is expected from different species depending on their dispersal capacities: a species with low dispersal capacity will be expected to be highly diverse, in contrast with those of higher dispersion range. The aim of this master thesis is to test whether the distribution and intraspecific diversity of North Atlantic marine species are affected by the past range shifts, which would be indicated by similar genetic patterns independently of the dispersal capacities of the species; or rather by strong oceanographic barriers, in which case, a difference between different species depending on their dispersal characteristics would be observed.
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