Chunchukova M, Kirin D
Department of Ecology and Environmental Protection, Agricultural University-Plovdiv, Mendeleev 12, 4000, Plovdiv, Bulgaria.
Helminthologia. 2018 Jul 28;55(3):222-229. doi: 10.2478/helm-2018-0016. eCollection 2018 Sep.
Species diversity and composition of the parasite communities of barbel () at the infracommunity and component community levels were studied in the Lower Danube River, Bulgaria. During the two-year investigations, five parasite species have been found in 92 host fish: (Cestoda), and (Acanthocephala) and larval stages of sp. and (Nematoda). and found in barbel represented new host records in Bulgaria. Parasite communities of barbel were species-poor and highly unbalanced. represented the dominant (core) species (prevalence 98.9 %), the second most frequent component parasite was sp. (P = 14.1 %) and remaining three species occurred only accidentally in barbels. Differences in species richness, prevalence, intensity of infection and ecological indices between individual seasons (spring, summer, autumn) were statistically signifi cant, but considerably affected by unequal species structure of communities with highly prevailing . Low parasite species diversity of barbel and low values of most ecological indices, when compared with previous studies in this area (or other Bulgarian parts of the River Danube) might indicate that environmental conditions are impaired and thus, not favourable for the development of barbel parasites (primarily to their intermediate host survival) in the Lower Danube River of Bulgaria.
在保加利亚多瑙河下游，研究了鲃鱼寄生虫群落的物种多样性及其在亚群落和组成群落水平上的组成。在为期两年的调查中，在92条宿主鱼中发现了5种寄生虫：绦虫纲的一种、棘头虫纲的两种，以及线虫纲的两种幼虫阶段。在保加利亚，鲃鱼体内发现的这两种寄生虫代表了新的宿主记录。鲃鱼的寄生虫群落物种贫乏且高度不平衡。某一种寄生虫是优势（核心）物种（感染率98.9%），第二常见的组成寄生虫是某种线虫（感染率14.1%），其余三种仅偶尔出现在鲃鱼体内。各个季节（春季、夏季、秋季）在物种丰富度、感染率、感染强度和生态指数方面的差异具有统计学意义，但受到优势物种高度占优的群落物种结构不均衡的显著影响。与该地区此前的研究（或多瑙河在保加利亚的其他河段）相比，鲃鱼的寄生虫物种多样性较低，且大多数生态指数值较低，这可能表明保加利亚多瑙河下游的环境条件受到损害，因此不利于鲃鱼寄生虫的发育（主要是不利于它们中间宿主的生存）。
