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Round Hickorynut (Obovaria Subrotunda)


Assessment Summary


Assessment Summary – May 2003

Common name:

Round hickorynut

Scientific name:
Obovaria subrotunda


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.


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