The macrozoobenthos of Cahul Lake (one of the largest in Ukrainian Danube basin) has been studied. We collected 256 samples at 12 littoral and sublittoral stations within [2006][2007][2008][2009][2010][2011][2012]. Some 95 species and subspecies were found, namely: Spongia -1 species, Turbellaria -2, Annelida -17, Bryozoa -1, Crustacea -19, Insecta -35, Gastropoda -15 and Bivalvia -5 species, among them 15 previously unregistered species were found. We discovered that the overall number of species increased downstream. Seasonal dynamics of species composition is poorly expressed. The maximum number of macrozoobenthos on the littoral was recorded in spring, maximal biomass -in summer; Maximum sublittoral abundance and biomass of macrozoobenthos were recorded in the summer. Key words: Lake Cahul, macrozoobenthos, taxonomic and quantitative characteristics
Проведено комплексное исследование кумовых раков водохранилища Сасык в 2013-2014 гг. Обнаружено три вида семейства Pseudocumidae: Schizorhynchus scabriusculus (Sars, 1894), Pterocuma pectinata (Sowinsky, 1893), P. rostrata (Sars, 1894). S. scabriusculus и P. pectinata приурочены, в основном, к прибрежной зоне водохранилища, к различным песчаным грунтам; P. rostratа найден только в открытой части на илистом песке. В пространственном и сезонном аспекте численность и биомасса раков изменялись в пределах 1-2 порядков величин; наибольшие значения зафиксированы весной 2014 г., наименьшиелетом 2013 г.Ключевые слова: Сасык, �umacea, таксономическая, гидробиологическая характеристика.відкритій частині на мулистому піску. У просторовому та сезонному аспектах чисельність та біомаса раків змінювалася в межах 1-2 порядків величин; найбільші показники зафіксовано навесні 2014 р., найменші -влітку 2013 р.
Летом 2009 г. изучен макрозообентос придунайского озера Кривое, расположенного в Одесской области. Обнаружено 26 видов губок, кольчатых червей, ракообразных, насекомых, брюхоногих и двустворчатых моллюсков. В верховье и средней части озера найдено по 24 вида, в низовье – 9. Наибольшей численностью характеризуются олигохеты, личинки стрекоз и хирономид (до 300 экз./м²), наибольшей биомассой – брюхоногие моллюски (до 17,0 г/м²). Максимальная численность макрозообентоса – 880 экз./м², биомасса – 40,2 г/м². Проведено сравнение макрозообентоса оз. Кривое с оз. Лунг. Донную фауну оз. Кривое можно рассматривать как обедненную для малых придунайских озер с меньшей антропогенной трансформацией.
The taxonomic composition and quantitative characteristics of the macrozoobenthos of the largest lake in Ukraine Yalpug, were studied. In 2006-2012 some 396 samples of macrozoobenthos were collected on the littoral and sublittoral of Lake Yalpug. 183 species and subspecies of Spongia, Hydrozoa, Turbellaria, Annelida, Crustacea, Insecta, Gastropoda, and Bivalvia were found. All the species were found on the littoral, while in the sublittoral -only 47 species. For the first time, we discoeverd 46 species for the lake zoobenthic fauna. Ponto-Caspian faunal complex was represented by 19 species. The littoral species number had changed from 63 species in the upper reaches to 160 in the lower reaches of the lake. In littoral habitat the number and biomass increased from winter to summer, and in the sublittoral habitat the abundance increased from winter to summer, whereas the biomass -from winter to autumn. The most abundant were oligochaetes and chironomids, the maximum biomass was registered for molluscs. During the growing season, the average abundance and biomass of macrozoobenthos in the littoral area were 2482 ind./m² and 117.0 g/m² respectively; in sublittoral area -1600 ind./m² and 121.0 g/m² respectively.
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