Conn D B, Ricciardi A, Babapulle M N, Klein K A, Rosen D A
Department of Biology, The University of the South, Sewanee, TN 37383, USA.
Parasitol Res. 1996;82(1):1-7. doi: 10.1007/s004360050058.
Dreissenid mussels, Dreissena polymorpha and D. bugensis, were found to be infected by the naidid oligochaete Chaetogaster limnaei at four sites in the St. Lawrence River. This is the first report of this species infecting dreissenids anywhere in the world. Most worms inhabited the mantle cavity, where they caused erosion of the mantle and gill epithelia as determined by histopathological examination. Others penetrated various tissues; one had invaded the ovary and was feeding on oocytes and ovarian tissues. Of 606 mussels examined, 166 (27.4%) harbored at least 1 C. limnaei. The prevalence varied between 1% and 80%, depending on the collection site and date. The worms were slightly but significantly more prevalent in D. bugensis than in D. polymorpha. The intensity ranged from 1 to 18 worms per infected host. Variations in prevalence and intensity were not related to the size or sex of the host, but the data did suggest some seasonality.
在圣劳伦斯河的四个地点发现，多形饰贝和波氏饰贝这两种河蚌被颤蚓科寡毛纲的Limnaei腹毛管盘虫感染。这是该物种在世界上任何地方感染河蚌的首次报告。大多数蠕虫栖息在围心腔中，组织病理学检查确定它们在那里导致了外套膜和鳃上皮的侵蚀。其他蠕虫则穿透了各种组织；有一只侵入了卵巢并以卵母细胞和卵巢组织为食。在检查的606只河蚌中，166只（27.4%）至少寄生有1只Limnaei腹毛管盘虫。患病率在1%到80%之间，具体取决于采集地点和日期。在波氏饰贝中，蠕虫的患病率略高但显著高于多形饰贝。感染强度为每只感染宿主1至18条蠕虫。患病率和感染强度的变化与宿主的大小或性别无关，但数据确实显示出一定的季节性。
