[Chromosomal polymorphism of the unique Baikal deep-water population of Sergentia flavodentata (Diptera, Chironomidae) from the region of hydrothermal venting].
The subject of this study is chromosomal polymorphism of a population of Baikal endemic species Sergentia flavodentata (Diptera, Chironomidae) from the Frolikh Bay region of hydrothermal venting at a depth of 420-430 m. In 35-67% of larvae, six heterozygous inversions were found to be preserved for 13 years (materials of 1991, 1994, 1996, 1999, 2003). The number of zygotic combinations reached 14; 0.5-0.7 inversions per individual was observed. It is suggested that stable chromosomal polymorphism characteristic of this species is nonrandom, being a mechanism of the population adaptation to the specific conditions of hydrothermal venting community based on bacterial biochemosynthesis.
Proviz
V I
VI
Limnological Institute, Siberian Branch of Russian Academy of Sciences, Irkutsk 664033, Russia. proviz@lin.irk.ru
D000222:Adaptation, Physiological / Q000235:genetics; D000818:Animals; D002683:Chironomidae / Q000235:genetics*; D007446:Chromosome Inversion / Q000235:genetics*; D002875:Chromosomes / Q000235:genetics*; D007621:Karyotyping; D007814:Larva / Q000235:genetics; D011110:Polymorphism, Genetic