Timm, T.E., Vshivkova T.S.
В журнале Acta Hydrobiologica Sinica
Год: 2009 Том: 31 Номер: Suppl. Страницы: 25-35
Lake Hanka is a large lowland lake in the Amur River basin, on the border between Russia and China. During a 1996-1997 faunistic survey, about 2500 specimens of oligochaetes were collected from ten qualitative benthic samples taken from the near-shore shallows of the lake and seven samples from the lower course of three inflowing rivers. In total, 42 taxa (37 nominal species and 5 unnamed taxa) were identified. Of these, 25 belong to the subfamily Naidinae, five to Pristininae, and 12 to other subfamilies within the Tubificidae; the remaining taxa are distributed amongst the Propappidae, Enchytraeidae, and Lumbriculidae. Of the 42 taxa identified during this study, 31 are reported here as new records for the lake. One species (Styloscolex hankensis) is described as new to science, and the morphologies of three others (Pristina aequidentata, Piguetiella amurensis and Aulodrilus japonicus) are discussed. The most common and abundant taxa in the muddy and/or vegetated habitats were Nais barbata, Nais pardalis, Limnodrilus hoffmeisteri, and unidentified juvenile Rhyacodrilinae. Propappus volki and Mesenchytraeus sp. occurred in large numbers in the unvegetated littoral surf zone with coarse sand or pebbles. In the rivers, the most abundant and diverse oligochaete fauna (with 14 species) was found downstream of a sewage purification station. This was also the only site where the cosmopolitan Tubifex tubifex was recorded. Lake Hanka and the adjacent water bodies are inhabited mainly by widely distributed oligochaetes, except for “Piguetiella” amurensis and Styloscolex hankensis, which are endemic to the Amur-Japanese zoogeographic subregion.
