Karatayev Alexander Y, Burlakova Lyubov E, Molloy Daniel P, Volkova Lyudmila K, Volosyuk Vladimir V
Department of Biology, Stephen F. Austin State University, P.O. Box 13003, SFA Station, Nacogdoches, TX 75962-3003, USA.
J Invertebr Pathol. 2002 Feb;79(2):80-5. doi: 10.1016/s0022-2011(02)00021-6.
This study, conducted in the Dnieper-Bug Canal in Belarus, is the first to monitor the seasonal (June-November) dynamics of infection with the parasitic ciliate Ophryoglena sp. in a zebra mussel (Dreissena polymorpha) population. Mean population prevalence and intensity of infection varied, respectively, from 11 to 62% and from 0.9 to 24.1 ciliates/mussel. Mean prevalence was highly correlated with mussel length in mussels <20 mm (R(2)=0.97) and was lower in larger mussels. Mean infection intensity in mussels 1-25 mm long was similarly correlated with their size (R=0.98), reached a maximum in the 20-25 mm size-class, and then sharply decreased, thus providing evidence, albeit limited, that high intensity of infection might be lethal. Transinfection of zebra mussels by Ophryoglena sp. was achieved in the laboratory-a first for a protozoan parasite of D. polymorpha; from an initial complete lack of infection, mean prevalence and intensity rose, respectively, to 86.7% and 8.3 ciliates/mussel.
