Zolovs M, Kanto J, Jakubāne I
Institute of Life Sciences and Technology,Daugavpils University,Parādes Street 1a,Daugavpils,Latvia,LV5401.
J Helminthol. 2018 May;92(3):332-342. doi: 10.1017/S0022149X1700044X. Epub 2017 May 24.
Species-specific microenvironmental preferences and interactions between parasite species have been the focus of many ecological studies. Here, we studied the distribution of ectoparasite species within the gill apparatus of bream (Abramis brama) from Lake Lubāns (Latvia) to establish whether digenean metacercariae: (1) prefer specific patches within the gill apparatus; (2) co-occur in the same patches with monogeneans and copepods within a host individual; and (3) interact with monogeneans and copepods. We recorded all parasites on gill arches of the same host species and used null models to analyse co-occurrences of digenean metacercariae, monogeneans and copepods. Zero-inflated mixture models were used to define the preferred patches of parasites. We found that digenean metacercariae (Bucephalus polymorphus) prefer specific patches of the gill apparatus to encyst, and shared these preferences with monogeneans and copepods, but did not interact with them. We concluded that digenean metacercariae have a species-specific microenvironmental preference to encyst in the gill apparatus and their occurrence (even in high numbers) does not reduce the success of attachment of monogeneans and copepods in the same gill patches.
特定物种的微环境偏好以及寄生虫物种之间的相互作用一直是许多生态学研究的重点。在此，我们研究了来自拉脱维亚卢布纳斯湖的鲷鱼（Abramis brama）鳃部外寄生虫物种的分布情况，以确定复殖吸虫尾蚴是否：（1）偏好鳃部内的特定区域；（2）在宿主个体内与单殖吸虫和桡足类动物共同出现在相同区域；以及（3）与单殖吸虫和桡足类动物相互作用。我们记录了同一宿主物种鳃弓上的所有寄生虫，并使用零模型分析复殖吸虫尾蚴、单殖吸虫和桡足类动物的共现情况。零膨胀混合模型用于确定寄生虫偏好的区域。我们发现复殖吸虫尾蚴（多形布氏吸虫）偏好鳃部的特定区域进行包囊，并且单殖吸虫和桡足类动物也有相同的偏好，但它们之间没有相互作用。我们得出结论，复殖吸虫尾蚴在鳃部有特定物种的微环境偏好进行包囊，并且它们的存在（即使数量众多）并不会降低单殖吸虫和桡足类动物在相同鳃区域附着的成功率。
