From endemism to widespread distribution: phylogeography of three amphidromous Sicyopterus species (Teleostei: Gobioidei: Sicydiinae)

New insight on population genetic connectivity of widespread amphidromous prawn Macrobrachium lar (Fabricius, 1798) (Crustacea: Decapoda: Palaemonidae)

“…The background hypothesis supporting these results is that oceans are partitioned into biogeographical provinces distinguished by habitat discontinuities (Briggs 1974;Gaither et al 2010). Thus, large-scale physical barriers separating biogeographical provinces can sporadically shape species distributions and intraspecific genetic structure over time, mainly acting on species displaying dispersal potential through the marine environment (e.g., Planes and Fauvelot 2002;Gaither et al 2010Gaither et al , 2011Lord et al 2012). An example of a biogeographical barrier in the Indo-Pacific is the vast expanse of open ocean separating the Western and Central Pacific islands (Gillespie et al 2008).…”

“…However, on a large geographical scale, present-day oceanic currents are usually not fully consistent with patterns of connectivity in marine species (Benzie 1998;Lessios 1998;Planes and Fauvelot 2002). Indeed, similar patterns of genetic differentiation were identified in two amphidromous species, the gastropod Neritina canalis (Crandall et al 2010) and the fish Sicyopterus lagocephalus (Lord et al 2012). Likewise, a sharp genetic break has been found between the Central and Western Pacific populations within the sea urchin species Echinometra mathaei and E. oblonga (Palumbi et al 1997), the coral reef fishes Acanthurus triostegus (Planes and Fauvelot 2002) and Scarus psittacus (Winters et al 2010), and the snapper fishes Lutjanus kasmira and L. fluvus (Gaither et al 2010).…”

“…Such patterns are commonly found in highly dispersive organisms inhabiting spatially fragmented or ephemeral habitats. This has been observed in several widespread reef fish species (e.g., Lutjanus fulvus, Gaither et al 2010;Naso unicornis, Horne et al 2008;Scarus psittacus, Winters et al 2010), but also in amphidromous species living in oceanic islands (Myers et al 2000;Kano and Kase 2004;Lord et al 2012).…”

“…Based on a few case studies relying on widespread geographic sampling, species persistence in insular freshwater systems may partially rely on multiple colonization events, which are influenced by the species dispersal abilities, distances between habitat patches, presenceabsence of favorable oceanic currents, and island biogeography (Murphy and Cowan 2007;Crandall et al 2010;Lord et al 2012;Feutry et al 2013b). An important finding of these population genetic studies has been the identification of a certain degree of spatial genetic structuring among biogeographic provinces, reflecting the effectiveness of biogeographical barriers for limiting larval dispersal.…”

“…Therefore, Indo-Pacific species that occur up to the Central Pacific are generally thought to have colonized eastern remote islands through a stepping-stone pattern of dispersal. Accordingly, genetic studies of widely distributed marine and freshwater species have demonstrated genetic divergences between Western and Central Pacific populations associated with patterns of isolation by distances (e.g., Palumbi et al 1997;Planes and Fauvelot 2002;Crandall et al 2010;Gaither et al 2010;Winters et al 2010;Lord et al 2012).…”