Changes in population structure of branchiopod crustacean Artemia sp. in Lake Aktash (Crimean Peninsula) in autumn-winter period (based on data from 2018)

The paper presents the research results of changes in age (for all ontogenetic groups) and sex structure, as well production cysts, two populations Artemia sp. living different contrasting environmental conditions (by area water body, its depth, salinity, nature bottom sediments, level anthropogenic load) hyperhaline bodies aquatic complex Lake Aktash. Data on dynamics size structure each or group (nauplii, metanauplii, juvenile preadult crayfish, females with ovisacas without them, males) are presented. cysts (Dmax Dmin) were measured, their was calculated. specificity is period conducting observations: autumn–early winter time population extinction. On example isolated ponds there studied relationship under decreasing salinity temperature – most significant abiotic factors. obtained study. branchiopods (g/m3) does not depend volume water. Populations have a wide range optimum zone for environment salinity. It has been found that main starting indicator beginning pause life (8-10°C), while lesser importance. There presented data composition abundance other species invertebrates (Diptera larvae, Coleoptera imagoes, copepods) during low-water autumn-winter