Abstract—

The long-term dynamics (over more than 70 years) of pike infection by cestodes Triaenophorus crassus and T. nodulosus in the Rybinsk Reservoir (the Volga River) has been studied in a comparative aspect. Cestode T. crassus is an invasive species that has entered the reservoir together with vendace Coregonus albula (the second intermediate host) from Lake Beloe; T. nodulosus is a native species that develops with the involvement of perch as a second intermediate host. Climate warming in the Rybinsk Reservoir manifests itself in a consistently growing average water temperature. This has led to a gradual decrease in the rate of pike infection by cestode T. crassus as a result of disturbances in the set of complex ecological relationships between the parasite and its hosts: a decrease in the abundance of large pike, fluctuations in the reservoir water level, and mass death of vendace in years with abnormally hot summers and the alternation of strong and weak year-classes in this short-cycle species (age 1+ to 3+). The long-term dynamics of pike infection by T. nodulosus is characterized by its consistently high rates and slight fluctuations. The abundance of perch population in the Rybinsk Reservoir remains high, and its age composition is stable, which contributes to a high rate of infection of both perch and pike by T. nodulosus. Cestode T. crassus occurs only in large pike (30 cm long or more); the rate of infection increases with age; T. nodulosus parasitizes mainly young pike (starting from young of the year), with the infection rate decreasing in large pike.

中文翻译：

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雷宾斯克水库中寄生虫 Triaenophorus crassus 和 T. nodulosus（Plathelminthes，Cestoda）对梭子鱼感染的长期动态：水利建设和气候变暖的影响

摘要-

已经在比较方面研究了雷宾斯克水库（伏尔加河）中cestodes Triaenophorus crassus和T. nodulosus梭鱼感染的长期动态（超过 70 年）。Cestode T. crassus是与来自 Beloe 湖的vendace Coregonus albula（第二中间宿主）一起进入水库的入侵物种；T. nodulosus是一种本地物种，在鲈鱼作为第二中间宿主的参与下发展。雷宾斯克水库的气候变暖表现为平均水温持续上升。这导致绦虫T. crassus的梭子鱼感染率逐渐下降由于寄生虫与其宿主之间的一系列复杂生态关系受到干扰：大型梭鱼数量减少，水库水位波动，以及在异常炎热的夏季和这个短周期物种（1+到3+）的强和弱年级。T. nodulosus梭鱼感染的长期动态特点是其持续的高发病率和轻微的波动。雷宾斯克水库的鲈鱼种群数量仍然很高，其年龄组成稳定，这导致T. nodulosus对鲈鱼和梭鱼的感染率很高。Cestode T. crassus只发生在大型梭鱼（30 厘米长或更长）；感染率随着年龄的增长而增加；T. nodulosus主要寄生于幼鱼（从幼鱼开始），大鱼的感染率下降。