Mapleleaf mussel (Quadrula quadrula) COSEWIC assessment and status report: chapter 1
Assessment Summary
Assessment Summary – April 2006
Common name: Mapleleaf Mussel - Saskatchewan - Nelson population
Scientific name: Quadrula quadrula
Status: Endangered
Reason for designation: Small area of occupancy; all localities but one are in one system, the Red Assiniboine drainage, and a major event could extirpate the population; no evidence for recruitment (few small individuals); numerous threats including degrading water quality from agriculture, domestic waste, commercial and industrial activities.
Occurrence: Manitoba
Status history: Designated Endangered in April 2006. Assessment based on a new status report.
Assessment Summary – April 2006
Common name: Mapleleaf Mussel - Great Lakes - Western St. Lawrence population
Scientific name: Quadrula quadrula
Status: Threatened
Reason for designation: This heavy shelled mussel that is shaped like a maple leaf, has a very small area of occupancy in watersheds dominated by agriculture with past and continuing declines due to habitat loss and degradation. Although the mussel has been lost from the Great Lakes and connecting channels due to zebra mussels, the numbers of mature individuals appear to be very large in two of the watersheds and three of five watersheds have recovery teams in place for aquatic species at risk. Zebra mussels continue to be a potential threat in watersheds that have numerous impoundments.
Occurrence: Ontario
Status history: Designated Threatened in April 2006. Assessment based on a new status report.
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