Timothy J. Sullivan Carey T. Knight Carol A. Stepien Patrick M. Kocovsky 2013 Whole-body morphometrics and 15 nuclear DNA microsatellite loci were analysed for 158 <i>Perca flavescens</i> collected during the spawning season from four spawning locations in central Lake Erie, two along the northern shore and two along the southern shore, to evaluate fine-scale variation (spanning 17-94 km). Results showed significant morphological and genetic differences among <i>P. flavescens</i> from the four locations. The magnitudes of differences were unrelated to geographic distance, demonstrating spatially heterogeneous levels of genetic divergence. These results linked morphometric and genetic variation, showing a discontinuity of scale between currently defined management units and population structure of P. flavescens in Lake Erie, and support that <i>P. flavescens</i> might exist as one or more metapopulations. Findings demonstrate the value of using complementary techniques for evaluating population structure. application/pdf 10.1111/jfb.12129 en Wiley Genetic and morphometric differences demonstrate fine-scale population substructure of the yellow perch Perca flavescens: need for redefined management units article