The population ecology of the leech (Hirudinoidea:Glossiphoniidae) Theromyzon rude

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Abstract
The seasonal pattern of changes in population structure of Theromyzon rude in Alberta shows a breeding period extending from May through September. Young first appear in the field population in July and continue to form a large proportion of the population through October. A seasonal migration into the shallow water zone during the ice-free period and from the shallow water zone into the deep water zone during the period of ice cover was determined.