| does dispersal across an aquatic geographic barrier obscure phylogeographic structure in the diamond-backed watersnake (nerodia rhombifer)? | the impact of barriers to dispersal and gene flow is often inferred to be the primary cause of lineage divergence and phylogeographic structure in terrestrial organisms. in particular, the mississippi river has been implicated as a barrier to gene flow in many species, including aquatic taxa. however, if barriers are permeable to organisms, then phylogeographic structure may be difficult to detect due to gene flow between lineages. using time-calibrated bayesian phylogenetic analyses of mtdna, a ... | 2010 | 20688180 |