Evidence for interannual variation in genetic structure of Dungeness crab (Cancer magister) along the California Current System.

摘要: Using a combination of population- and individual-based analytical approaches, we provide comprehensive examination genetic connectivity Dungeness crab (Cancer magister) along ~1,200 km the California Current System (CCS). We sampled individuals at 33 sites in 2012 to establish baseline diversity hierarchal population structure then assessed interannual variability our estimates by sampling again 2014. Genetic showed little variation among or across years. In 2012, observed weak differentiation (FST range = -0.005-0.014) following pattern isolation distance (IBD) significantly high relatedness within nine sites. 2014, pairwise FST were lower range = -0.014-0.007), there was no spatial autocorrelation, fewer had significant evidence relatedness. Based on these findings, propose that physical oceanographic conditions CCS influences larval recruitment thus gene flow, contributing structure. Estimates effective size (Ne ) large both Together, results suggest may constitute single evolutionary population, although geographically limited dispersal an ephemeral signal IBD. Furthermore, findings demonstrate populations marine organisms be susceptible temporal changes over short time periods; thus, measures should considered.