Distribution of helminthes in the digestive tract of the ide Leuciscus idus: Analysis of interspecific relations [Russian]

摘要

The distribution of helminthes in the digestive tract of ide from the Rybinsk Reservoir was studied. The digestive tract in this fish was divided into 7 equal sections. In 41 specimens of ide, 12631 individuals of helminthes of 11 species were found, including 9775 individuals of the trematoda Sphaerostomum globiporum. The species were distributed along the digestive tract in the certain sequence: mass species occupied its central part, rare species were located in edge areas of the tract. When the number of species increased, their linear distributions decreased. The number of vacant sections negatively correlated with the species diversity and abundance of helminthes. Fundamental and realized species niches are widely overlapped. The niches of the species located in the center of the digestive tract were overlapped to a greater degree than in the species with "central" and "peripheral" localization. The correlation between the abundance of different species was weak and unreliable, negative relations predominated. The species of the community investigated interacted that was evidenced by their sequential distribution along the digestive tract, displacement of rare species to periphery, overlapping and diminishing of niches in one species in the presence of others, the definite sequence of fish invasion, and a separate use of resources in time.