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- W2463758238 abstract "Branchiobdellid annelids and their freshwater crayfish hosts are generally thought to have a commensal relationship. Branchiobdellids of the genus Cambarinco- la exploit their hosts through a variety of mechanisms; however, an effect of branchiobdellids on crayfish has not been conclusively demonstrated. We investigated whether branchiobdellids positively affect the host cray- fish Cambarus chasmodactylus in the New River, North Carolina. In a laboratory experiment, we placed 0, 3, or 6 branchiobdellids on C. chasmodactylus and observed a significant effect of branchiobdellid presence on both growth and mortality of host crayfish; crayfish with branchiobdellids exhibited faster growth and lower mor- tality with increasing branchiobdellid density. A tracer experiment demonstrated that branchiobdellids feed on items found in the branchial chamber of C. chasmodac- tylus. We hypothesize that such feeding activity by branchiobdellids reduces fouling of crayfish gills by epi- bionts and particulate matter and could lead to the re- duced mortality and increased growth rates observed in the laboratory experiment. Specifically, Cambarincola may improve the ventilatory and excretory fitness of C. chasmodactylus by cleaning gill filaments. Field data support this hypothesis by demonstrating that branchiob- dellids are found disproportionately at sites proximal to the branchial chamber in the New River. This study pro- vides evidence that the relationship between C. chasmo- dactylus and Cambarincola may be a cleaning symbio- sis, at least in environments where gill fouling is a prob- lem for C. chasmodactylus." @default.
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- W2463758238 date "2002-01-01" @default.
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