Population dynamics of the glacial relict amphipods in a subarctic lake: role of density-dependent and density-independent factors.

Relative role of intrinsic density-dependent factors (such as inter- and intraspecific competition, predation) and extrinsic density-independent factors (environmental changes) in population dynamics is a key issue in ecology. Density-dependent mechanisms are considered as important drivers of population dynamics in many vertebrate and insect species; however, their influence on the population dynamics of freshwater invertebrates is not clearly understood. In this study, I examined interannual variations in the abundance of the glacial relict amphipod in a small subarctic lake based on long-term (2002-2019) monitoring data.

Genetic turnovers and northern survival during the last glacial maximum in European brown bears.

The current phylogeographic pattern of European brown bears () has commonly been explained by postglacial recolonization out of geographically distinct refugia in southern Europe, a pattern well in accordance with the expansion/contraction model. Studies of ancient DNA from brown bear remains have questioned this pattern, but have failed to explain the glacial distribution of mitochondrial brown bear clades and their subsequent expansion across the European continent. We here present 136 new mitochondrial sequences generated from 346 remains from Europe, ranging in age between the Late Pleistocene and historical times.