DYNAMICS OF FOCI OF BIRD NOTOCOTYLIDOSIS IN THE ECOSYSTEM OF LAKE CHANY (WESTERN SIBERIA) IN THE LAST 80 YEARS

Objective  of research:    to  perform the analysis  of  dynamics  of bird notocotylidosis  foci in the ecosystem of Lake Chany in Western Siberia in the last 80 years.  Materials and methods: Helminthological examinations of snails of the family Bithyniidae and birds were conducted in the basin of Lake Chany in 1996–2013. The intestines of 172 birds belonging to 17 species were examined using the method of incomplete helminthological autopsy. The collection of snails of the family Bithyniidae was carried out manually in the summer season. All together 9 000 examples of snails belonging to Bithynia tentaculata and B. troscheli were collected. The infestation rate for cercariae in the snails was detected by the compressor method with the following calculation of extensity and intensity of infection and the index of abundance.  Results and discussion:    Marites of trematodes of the family Notocotylidae were registered in 7 of 17 species.  Different  rate of  infestation  by the  family Notocotylidae  of  various bird species was determined. The extensity of infection was in baldicoot  - 70,5 %, mallard  - 57,1, garganey  - 42,8, red headed duck - 54,5 % by the intensity of infection 35,6; 8,0; 19,3 and 5,5 examples, respectively.  During scientific  investigation about birds in the area of Lake Chany  in 1934–1938 notocotylides were found in 15 of 90 bird species. The analysis of dynamics of bird notocotylidosis in the ecosystem of Lake Chany (Western Siberia) in the last 80 years revealed that the bird infestation had increased from 23 % in the 30s of the last century up to 31 % in the 70s, and up to  60 % in our today's research. In the last 80 years 22 bird species served as primary hosts. The detection of marites  of the  family Notocotylidae  by different scientists  in all  the  years of research and the annual presence of parthenitas in snails of the  family Bithyniidae  indicates on the constant  focus of notocotylidosis  in the ecosystem of  Lake Chany. The infestation of semi-aquatic birds has been increased more than twice in the last years.  

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