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 (mm2) per milligram of dry tissue and clearance rate among the unionid species studied. As a comparison, Corbicula jluminea and Dreissena polymorpha were also examined and both tended to clear bacteria more rapidly than the lotic unionids.RCsumC : Neuf espkces d'unionidae ont absorb6 tous les Escherichia coli eleves en laboratoire dans I'eau d'un etang artificiel. Les six espkces recoltees dans des rivikres avaient des taux de clearance plus rapides que les trois espkces provenant des ktangs aprks normalisation de la clearance pour l'exprimer en millilitres par gramme de tissu sec par minute. Les resultats d'une analyse de variance indiquent que tous les unionidits lotiques examines forment un groupe dont les taux de clearance sont semblables. En normalisant les donnees en fonction de la surface des branchies, les taux de clearance de tous les unionides lotiques deviennent remarquablement semblables les uns aux autres, quelle que soit la masse, mais diffkrent significativement de ceux des unionides Ienitiques. Les cirres observes sur les cellules latero-frontales des branchies chez les unionides lotiques tendent a etre complexes, contenant >25 cils par plaque, alors que les espkces provenant des etangs ont des cirres plus petits ( > 16 cils par plaque). I1 y a une forte correlation entre la surface du cirre (mm2) par milligramme de tissu sec et le taux de clearance chez les espkces etudiees. Pour fins de comparaison, Corbicula jluminea et Dreissena polymorpha ont egalement ete etudies et les deux espkces ont des taux de clearance de batteries plus rapides que les unionides lotiques. [Traduit par la Redaction]
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