Mikheev V N, Pasternak A F, Taskinen J
Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, 119071, Moscow, Russia.
Shirshov Institute of Oceanology, Russian Academy of Sciences, 119071, Moscow, Russia.
Dokl Biol Sci. 2019 Sep;488(1):141-144. doi: 10.1134/S0012496619050053. Epub 2019 Nov 15.
Influence of fish personality on infection rate is poorly studied. In the experiments on young-of-the-year Oncorhynchus mykiss and cercariae of the trematode Diplostomum pseudospathaceum, we tested the hypothesis that infection rate differs between more and less active ("bold" and "shy") fish. Will individual differences in infection persist upon re-infection? Fish serve as a second intermediate host for this trematode. Positive correlation was found between the results of consecutive infections. Accumulation of parasites with successive infections leads to an aggregated distribution of D. pseudospathaceum among the hosts, affecting individual fitness and polymorphism in fish populations. Persistent individual differences in parasite burden among fish and, as a result, vulnerability for predators confirms the role of parasites as an important factor of natural selection.
鱼类个性对感染率的影响鲜有研究。在针对当年生虹鳟和吸虫双穴吸虫尾蚴的实验中，我们检验了一个假设，即感染率在活动较多和较少（“大胆”和“害羞”）的鱼类之间存在差异。再次感染时，感染方面的个体差异是否会持续存在？鱼类是这种吸虫的第二中间宿主。连续感染的结果之间发现了正相关。寄生虫随着连续感染而积累，导致双穴吸虫在宿主间呈聚集分布，影响鱼类种群的个体适应性和多态性。鱼类之间寄生虫负荷存在持续的个体差异，进而导致对捕食者的易感性，这证实了寄生虫作为自然选择重要因素的作用。
