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Karyotype variability in successive generations after hybridization between the great sturgeon, Huso huso (L.), and the sterlet, Acipenser ruthenus L.
Author(s) -
Arefjev V. A.
Publication year - 1989
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1989.tb03033.x
Subject(s) - huso , biology , karyotype , microchromosome , sturgeon , ploidy , zoology , chromosome , aneuploidy , fish <actinopterygii> , genetics , fishery , gene
The karyotypes of bester (the hybrid between great sturgeon and sterlet) in three generations do not differ in diploid chromosome number from parental species and are displaced towards the sterlet in numbers of bi‐ and uni‐armed chromosomes and chromosome arms. The variability of quantitative karyotypic parameters other than number of bi‐armed chromosomes increases considerably (double, on average) in F 1 and F 2 and declines to the level characteristic of the parental species in F 3 . The variability results mainly from aneuploidy in microchromosomes and the karyotypic variabilities of 3 to 6‐week‐old and 4 to 5‐month‐old fish are the same. The stabilization of the hybrid karyotype in the third generation is rather rapid and may reflect the formation of a breed. The degree of individual karyotypic variability estimated on the basis of the coefficient of variation is 2‐3 % for parameters other than the number of microchromosomes, for which it is 6‐7%.