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Chromosomal study of the lenoks, Brachymystax (Salmoniformes, Salmonidae) from the South of the Russian Far East

  • Kartavtseva, I.V. (Institute of Biology and Soil Science of the Far East Branch of the Russian Academy of Sciences) ;
  • Ginatulina, L.K. (Institute of Biology and Soil Science of the Far East Branch of the Russian Academy of Sciences) ;
  • Nemkova, G.A. (Institute of Biology and Soil Science of the Far East Branch of the Russian Academy of Sciences) ;
  • Shedko, S.V. (Institute of Biology and Soil Science of the Far East Branch of the Russian Academy of Sciences)
  • Received : 2012.11.23
  • Accepted : 2013.02.06
  • Published : 2013.02.28

Abstract

An investigation of the karyotypes of two species of the genus Brachymystax (B. lenok and B. tumensis) has been done for the Russia Primorye rivers running to the East Sea basin, and others belonging to Amur basin. Based on the analysis of two species chromosome characteristics, combined with original and literary data, four cytotypes have been described. One of these cytotypes (Cytotype I: 2n=90, NF=110-118) was the most common. This common cytotype belongs to B. tumensis from the rivers of the East Sea basin and B. lenok from the rivers of the Amur basin, i.e. extends to the zones of allopatry. In the rivers of the Amur river basin, in the zone of the sympatric habitat of two species, each taxon has karyotypes with different chromosome numbers, B. tumensis (2n=92) and B. lenok (2n=90). Because of the ability to determine a number of the chromosome arms for these two species, additional cytotype have been identified for B. tumensis: Cytotype II with 2n=92, NF=110-124 in the rivers basins of the Yellow sea and Amur river and for B. lenok three cytotypes: Cytotype I: 2n=90, NF=110 in the Amur river basin; Cytotype III with 2n=90, NF=106-126 in the Amur river basin and Cytotypes IV with 2n=92, NF=102 in the Baikal lake.

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