Rampant drift in artificially fragmented populations of the endangered tidewater goby (Eucyclogobius newberryi)

摘要: Habitat fragmentation and its genetic consequences are a critically important issue in evaluating the evolutionary penalties of human habitat modification. Here, we examine structure diversity naturally subdivided artificially fragmented populations endangered tidewater goby (Eucyclogobius newberryi), small fish restricted to discrete coastal lagoons estuaries California, USA. We use five from 300- km spatial scale as standard assess migration drift relative eight bay 30- km scale. Using nine microsatellite loci 621 individuals, 522-base fragment mitochondrial DNA control region 103 found striking differences influences on variation at these two scales. Overall, exhibited consistent pattern higher differentiation significantly lower populations. Thus, even species characterized by isolation subdivision, further artificial appears result substantial population may not be sustainable.