EARTHWORMS (ANNELIDA: OLIGOCHAETA) IN CANADIAN ECOZONES.

Ecozones are described by the basal physical features of the environment: geological structure and chemistry, the landforms which have developed on the geological underpinnings over time, and climate. These are major geographical units with a characteristic macro climate, whose constituent physiographic forms, faunal and floral realms, hydrological systems and soils are inter-related. This paper examines the 33 earthworm species in three families recorded in the 15 Canadian ecozones. There is a discussion on the effect of climate change may have on earthworm's northern migration. [ABSTRACT FROM AUTHOR]