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Clearance of laboratory-cultured bacteria by freshwater bivalves: differences between lentic and lotic unionids

Canadian Journal of Zoology

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Abstract

Nine species of unionids cleared laboratory-raised Escherichia coli from artificial pond water. The six unionid species collected from rivers had higher clearance rates than the three species collected from ponds, when clearance was normalized to millilitres per gram of dry tissue mass per minute. Analysis of variance indicated that all lotic unionids examined form a group with similar clearance rates. When normalized on the basis of gill surface area, rates of clearance by all of the lotic unionids become remarkably similar to one another regardless of mass, but differ significantly from those of the lentic unionids. The cirri found on the laterofrontal cells of the gills of lotic unionids tend to be complex, containing >25 cilia per cirral plate, while the cirri of the unionid species collected from ponds have smaller cirri (<16 cilia per cirral plate). There was a strong correlation between cirral surface area (mmA?) per milligram of dry tissue and clearance rate among the unionid species studied. As a comparison, Corbicula fluminea and Dreissena polymorpha were also examined and both tended to clear bacteria mor rapidly than the lotic unionids.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Clearance of laboratory-cultured bacteria by freshwater bivalves: differences between lentic and lotic unionids
Series title:
Canadian Journal of Zoology
Volume
75
Issue:
11
Year Published:
1997
Language:
English
Contributing office(s):
Great Lakes Science Center
Description:
p. 1857-1866
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Canadian Journal of Zoology
First page:
1857
Last page:
1866
Number of Pages:
9