The estimation of elimination potential of water biocoenoses in relation to freeliving forms of Opisthorchis felineus
1994
Beehr, S.A. | Strugova, A.S. | German, S.M.
Different methods of estimating the elimination potential of invertebrate hydrobionts, members of water biocenoses, in relation to freeliving instars such as egg (miracidium) and cercarium of O. felineus are considered. Calculations and conclusions are based on field and investigation carried out in the period 1985-1992. The elimination process in biocenoses does not practically influence intensity of infection, but influences significantly the extensity of the infection of the molluscs Codiella with O. felineus larvae. This process is also the cause of low extensity of infection of Codiella in natural water reservoirs (usually less 1-2.5 %) in all infection centres of exUSSR area including Western Siberia. The eggs (miracidia) of O. felineus are eliminated with different effectivity by invertebrate of nectobenthos (Oligochaeta, molluscs, and with less rate by arthropods). Coracidia are eliminated generally by nectoplankton crustaceans and water insect larvae. Invertebrate hydrobionts eliminate about 70 % cercaria of the number coming out of the infected molluscs being intermedial hosts
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