Institute of Biology, Karelian Research Centre of RAS, Laboratory of Ecology of Fish and Water Invertebrates, Pushkinskaia str. 11, 186005 Petrozavodsk, Russia.
Zoological Institute of the Russian Academy of Sciences, White Sea Biological Station, Universitetskaja Naberezhnaja 1, 199034 St. Petersburg, Russia.
J Invertebr Pathol. 2019 Sep;166:107220. doi: 10.1016/j.jip.2019.107220. Epub 2019 Aug 6.
Whether metacercariae of the digenean Himasthla elongata (Himasthlidae) are harmful to their secondary intermediate hosts, the blue mussel, Mytilus edulis, is a disputable question. To shed light on this issue, we performed field monitoring of the heart rate (HR) in mussels infected with H. elongata over a period of 1.5 years. We observed a significant rise in HR in infected mussels, but only 1 year after infection and at temperatures of 15-17 °C. HR variance also grew sharply in infected mussels within the same temperature range. We also detected a decreased ability of infected mussels to compensate for the rise in the environment temperature. Finally, growth rate in the infected mussels was slower compared to the control group. We provide evidence for measurable pathogenic effects caused by H. elongata metacercariae in their secondary intermediate mussel hosts.
关于并殖吸虫的后尾蚴是否会对其第二中间宿主贻贝（贻贝科）造成损害，这是一个有争议的问题。为了阐明这个问题，我们在 1.5 年的时间里对感染了伸长并殖吸虫的贻贝的心率（HR）进行了现场监测。我们观察到感染贻贝的 HR 显著升高，但仅在感染后 1 年和 15-17°C 的温度下。在同一温度范围内，感染贻贝的 HR 方差也急剧增加。我们还检测到感染贻贝对环境温度升高的补偿能力下降。最后，与对照组相比，感染贻贝的生长速度较慢。我们为伸长并殖吸虫后尾蚴在其第二中间宿主贻贝宿主中引起可测量的致病作用提供了证据。
