Open AccessCHANGES IN ONTOGENETIC PARAMETERS IN DAPHNIA MAGNA INFLUENCED BY SOLUTIONS OF BENZENE COMPOUNDS
Author(s) -
Alexander V. Gorbunov,
Dmitry Nikiforov-Nikishin,
Oleg Gorbunov
Publication year - 2021
Publication title -
vestnik astrahanskogo gosudarstvennogo tehničeskogo universiteta. seriâ: rybnoe hozâjstvo
Language(s) - English
Resource type - Journals
eISSN - 2309-978X
pISSN - 2073-5529
DOI - 10.24143/2073-5529-2021-2-125-133
Subject(s) - daphnia magna , biology , fecundity , daphnia , ontogeny , daphnia galeata , cladocera , branchiopoda , toxicology , zoology , toxicity , crustacean , chemistry , population , genetics , demography , organic chemistry , sociology
The article presents the research results of biological parameters of Daphnia magna development at the critical stages of ontogenesis influenced by the aqueous solutions of ecotoxicants: nitrobenzene and trichlorobenzene. The periods of reproduction and development in Daphnia magna are stated to be decisive, among other parameters (physiological, biochemical). In fact, the entire period of embryogenesis in Daphnia is quite vulnerable, compared to the further stages of development. Under the action of solutions of ecotoxicants taken for the research Daphnias have
a decreased fertility and a delayed oogenesis. The next stage of sensitivity is the number of cast carapaces. The least sensitive parameter is the survival rate of adults. Increasing the remote toxic effect in three generations of Daphnias was not detected in the course of research. The Daphnia magna test object showed high sensitivity to nitrobenzene and trichlorobenzene acting as water environment pollutants in all the experiments. For the main ontogenetic parameters in the assessment of water quality it is preferable to take fecundity and violation of development processes at the pre-natal stages of Daphnia magna. According to the survival parameter, the maximum permissible concentration of the studied benzene compounds was 0.01 mg/l, which was determined by the most sensitive parameters and critical stages of ontogenesis