Genetic signature of recent glaciation on populations of a near-shore marine fish species (Syngnathus leptorhynchus).

摘要: Continental glaciation has played a major role in shaping the present-day phylogeography of freshwater and terrestrial species Northern Hemisphere. Recent work suggests that coastal during ice ages may have also had significant impact on marine species. The bay pipefish, Syngnathus leptorhynchus, is near-shore Pacific coast fish with an exceptionally wide latitudinal distribution, ranging from Bahia Santa Maria, Baja California to Prince William Sound, Alaska. Survey data indicate S. leptorhynchus experiencing range expansion at northern limit its range, consistent colonization southern populations. present study uses six novel microsatellite markers mitochondrial DNA (mtDNA) sequence population genetic structure four populations leptorhynchus. Deficits mtDNA nuclear diversity regions glaciated last glacial maximum (LGM) [c. 18 000 years before (bp)] suggest these were effected by events. Direct estimates divergence times derived both isolation isolation-with-migration models evolution are postglacial phylogenetic history north LGM. Sequence further end been separated three since long interglacial event (c. 130 bp), suggesting topographical features along maintain separation unimpacted glaciation.