title: [Role of free-living stages of trematode development in biocenoses].
abstract: The evaluation of the biomass of eggs and cercarians of some species of trematodes is done. It was shown that the summary mass of eggs entering biocoenosis exceeds considerably the biomass of adult trematodes; so the biomass of cercarians can amount to 50% of biomass of the infected part of mollusk population. The most part of eggs and cercarians is eliminated in biocoenosis by biotic and abiotic environmental factors and is included into biocoenotic trophic chains through eliminators or saprophags. When the main producers of useful production perform as eliminators, the organic substance contained in eggs and cercarians transforms into economically useful production. Such eliminators are the most perspective agents of biological control of pathogen helminths.
mesh_terms: D000818:Animals; D004463:Ecology; D010270:Parasite Egg Count; D014200:Trematoda / Q000254:growth & development* / Q000469:parasitology
vernacular_title: O roli svobodnozhivushchikh stadiĭ razvitiia trematod v biotsenozakh.