unicentric distribution The occurrence of endemic species (see endemism) in very local areas. In Scandinavia, for example, about 40 endemics are found in just one or two areas; these areas are thought by some authorities to have been refuges from the glaciation of the late Pleistocene (i.e. they were nunataks above the ice sheets). Compare bicentric distribution.

unicentric distribution The occurrence of endemic species (see ENDEMISM) in very local areas. In Scandinavia, for example, about 40 endemics are found in just 1 or 2 areas; these areas are thought by some authorities to have been refuges from the glaciation of the late Pleistocene (i.e. they were nunataks above the ice sheets).