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Round Hickorynut (Obovaria Subrotunda)

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COSEWIC
Assessment Summary

 

Assessment Summary – May 2003

Common name:

Round hickorynut

Scientific name:
Obovaria subrotunda

Status:
Endangered

Reason for designation:
This species has been lost from about 90% of its former range in Canada. Populations in the Grand and Thames rivers are extirpated and populations in the Sydenham River are declining, all due to the combined effects of pollution and agricultural impacts. Most of the Great Lakes populations have been lost due to impacts of the zebra mussel, and the remaining population in the St. Clair delta near Walpole Island may be at risk. If the Eastern Sand Darter were the host of this species, then the decline of this threatened fish would affect the mussel's survival.

Occurrence:
Ontario

Status history:
Designated Endangered in May 2003. Assessment based on a new status report.