Matejusová Iveta, Simková Andrea, Sasal Pierre, Gelnar Milan
Department of Zoology and Ecology, Faculty of Science, Masaryk University, Kotlárská 2, 611 37 Brno, Czech Republic.
Parasitol Res. 2003 Mar;89(4):290-6. doi: 10.1007/s00436-002-0682-8. Epub 2002 Nov 6.
The outlying mean index (OMI) method was used to test for seasonal microhabitat partitioning in Pseudodactylogyrus anguillae and Pseudodactylogyrus bini communities parasitising European eel ( Anguilla anguilla L.) in four seasons. No differences in the occurrence of parasites were found in different seasons or on different gill arches. The OMI analysis showed that hemibranch separation and gill segments were the main factors explaining the variation in parasite niche occupation for the first factorial axis, which was generally more significant than the second factorial axis. The OMI and tolerance indices were compared for both species in the seasons studied, and the main differences between species indices were recorded. P. anguillae and P. bini communities were partitioned in the seasons with high epidemiological parameters of the infection. In the seasons with low epidemiological parameters, or in seasons when the parasite species preferred gill arches, the characters of gill division (lower level of gill division than gill arches) were not important for the partitioning of the Pseudodactylogyrus communities.
采用边缘平均指数（OMI）法，对寄生在欧洲鳗鲡（Anguilla anguilla L.）上的鳗鲡伪指环虫（Pseudodactylogyrus anguillae）和比氏伪指环虫（Pseudodactylogyrus bini）群落四季的季节性微生境划分进行了检测。在不同季节或不同鳃弓上，未发现寄生虫出现情况存在差异。OMI分析表明，半鳃分离和鳃段是解释寄生虫生态位占据变化的主要因素，第一因子轴通常比第二因子轴更显著。在研究的季节中，对两个物种的OMI和耐受指数进行了比较，并记录了物种指数之间的主要差异。鳗鲡伪指环虫和比氏伪指环虫群落在感染流行病学参数较高的季节进行了划分。在流行病学参数较低的季节，或在寄生虫物种偏好鳃弓的季节，鳃部划分特征（鳃部划分水平低于鳃弓）对于伪指环虫群落的划分并不重要。
