| recent postglacial range expansion drives the rapid diversification of a songbird lineage in the genus junco. | pleistocene glacial cycles are thought to have played a major role in the diversification of temperate and boreal species of north american birds. given that coalescence times between sister taxa typically range from 0.1 to 2.0 myr, it has been assumed that diversification occurred as populations were isolated in refugia over long periods of time, probably spanning one to several full glacial cycles. in contrast, the rapid postglacial range expansions and recolonization of northern latitudes fol ... | 2007 | 17725978 |
| postglacial population expansion drives the evolution of long-distance migration in a songbird. | the evolution of long-distance migratory behavior from sedentary populations is a central problem in studies of animal migration. three crucial issues that remain unresolved are: (1) the biotic and abiotic factors promoting evolution of migratory behavior, (2) the geographic origin of ancestral sedentary populations, and (3) the time scale over which migration evolves. we test the role of postglacial population expansions during the quaternary in driving the evolution of songbird migration again ... | 2006 | 17236431 |
| variation in selective regimes drives intraspecific variation in life-history traits and migratory behaviour along an elevational gradient. | comparative studies, across and within taxa, have made important contributions to our understanding of the evolutionary processes that promote phenotypic diversity. trait variation along geographic gradients provides a convenient heuristic for understanding what drives and maintains diversity. intraspecific trait variation along latitudinal gradients is well-known, but elevational variation in the same traits is rarely documented. trait variation along continuous elevational gradients, however, ... | 2020 | 31671204 |