title: A new record of Chironomus (Chironomus) acidophilus Keyl (Diptera, Chironomidae) from the Uzon volcanic caldera (Kronotsky Reserve, Kamchatka Peninsula, Russia), its karyotype, ecology and biology.
abstract: Morphology, cytology, ecology and biology of Holarctic Chironomus (Chironomus) acidophilus Keyl, 1960 (Diptera, Chironomidae) was examined from material collected in the geothermal Vosmerka Lake (pH=2.0-2.5). An illustrated redescription of C. acidophilus is given on the basis of adult males reared from field-collected pupae, and of simultaneously collected larvae. Additional larvae belonging to the pseudothummi-complex were identified as C. acidophilus on the basis of their karyotype. The karyotype of C. acidophilus (2n=8) and detailed mapping of the 4 chromosome arms A, E, D and F are provided. The population of C. acidophilus from Kamchatka was found to be karyologically monomorphic. Information on distribution and ecology of C. acidophilus from Vosmerka Lake (total mineralization 1583.5 mg/l) is also given. Chironomus acidophilus is the only species of aquatic insects recorded in this lake. Lack of competition and a richness of food resources contribute to the high abundance (35161 ind./m2) and biomass (11.342 g/m2) of the larvae of C. acidophilus in Vosmerka Lake.
authors.affiliation: Institute of Biology and Soil Science, Russian Academy of Science, Far East Branch, 100-letya Vladivostoka av. 159, Vladivostok, 690022, Russia. E-mail: zorina@biosoil.ru; Email: zorina@biosoil.ru.
authors.forename: Oksana V
authors.initials: OV
authors.lastname: Orel
authors.affiliation: Kronotsky State Biosphere Reserve, Ryabikova st. 48, Elizovo, Kamchatka Territory, Russia.; Email: lel47@mail.ru.
authors.forename: Ludmila E
authors.initials: LE
authors.lastname: Lobkova
authors.affiliation: Zoological Institute, Russian Academy of Sciences, Russia.; Email: chironom@zin.ru.
authors.forename: Sergey V
authors.initials: SV
authors.lastname: Zhirov
authors.affiliation: Zoological Institute, Russian Academy of Sciences, Russia.; Email: chironom@zin.ru.
authors.forename: Ninel A
authors.initials: NA
authors.lastname: Petrova
mesh_terms: D000818:Animals; D002683:Chironomidae / Q000033:anatomy & histology / Q000145:classification / Q000235:genetics / Q000648:ultrastructure; D005260:Female; D059785:Karyotype; D060106:Lakes; D008297:Male; D059007:Polytene Chromosomes / Q000648:ultrastructure; D012426:Russia