Research Document - 2008/083
Pre-COSEWIC assessment of the Wavyrayed Lampmussel (Lampsilis fasciola)
By T.J. Morris, D.J. McGoldrick, J.L. Metcalfe-Smith,
D. Zanatta and P.L. Gillis
Abstract
A regional science peer review meeting was held on November 14, 2008 in Burlington Ontario at the Canada Centre for Inland waters. The purpose of the meeting was to peer-review information relevant to the 10-year update for the original COSEWIC status assessment for the Wavyrayed Lampmussel (Lampsilis fasciola) in Canadian waters. This freshwater mussel was originally assessed as Endangered by COSEWIC in 1999 and subsequently added to Schedule 1 under the Species at Risk Act in 2003. A draft of this Research Document was presented as a working paper at the workshop and was intended to provide a summary of all available new data related to the status and trends of the species and its habitat as well as threats to this species inside and outside of Canadian waters. A large amount of new data has been collected since the initial COSEWIC assessment in 1999 and considerably more is known about the biology of all life stages and of the threats to the species. Limited trend data suggest that the species is likely expanding its range in the Grand and Thames rivers where it has become a significant component of the mussel community (20 – 50% numerically). A new large population has been confirmed in the Maitland River and a small population still persists in the Ausable River. Intensive efforts in the Sydenham River have failed to detect any live individuals. Reproduction and a range of size/age classes have been confirmed for all extant populations.
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