Tiunova T.M.
V.Ya.Levanidov memorial lectures 2021; (9): 175-185
Data were obtained on the species composition and structure of the community of benthic invertebrates of a temporary stream in the Southern Primorye during the water (April - June) and waterless (October) periods. During the study period, 44 species and taxa of a higher systematic rank were collected. The most numerous group was insects. Among insects, Diptera of the family Chironomidae (26 species) and caddis flies (Trichoptera) (4 species) dominated. Mayflies (Ephemeroptera) were represented by single species. Other recorded groups included two families and two species of arachnids and one family and two species of bivalve Mollusks. Crustacea, Oligochaeta, Nematoda, Turbellaria, larvae of beetles (Coleoptera), biting midges (Ceratopoganidae), have not been identified. The largest number of species was recorded in April (36 taxa) and the smallest in June (21 taxa). During the dry period, only eight taxonomic groups were recorded. A number of species occurs only in temporary streams. Others can inhabit both temporary and permanent streams. Dominant groups during almost the entire study were Oligochaeta and Chironomidae. It is shown that the studied invertebrate community is adapted to a relatively short (2,5-3 months) water period. Some taxa resist the dry season with resting eggs (mayfly Metreletus omelkoi ) or cocoons (Oligochaeta and Chironomidae Hydrobaenus majus Makarchenko et Makarchenko and H. distinctus Makarchenko et Makarchenko).
