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Feniova I. Yu. Razlutskij V. I. Gladyshev M. I. Kostrzewska-Szlakowska I. Majsak N. N. Rzepecki M. Sushchik N. N. Zilitinkevich N. S. 《Russian Journal of Ecology》2019,50(1):50-57
Russian Journal of Ecology - It has been shown that the main drivers of the dynamics of cladoceran and copepod abundances can be predators (fish), the quantity and/or quality of food in terms of... 相似文献
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A possibility of introducing alien cladoceran species into the pelagial zone of mesotrophic Lake Glubokoe has been estimated. For this purpose, observations have been performed on the cohorts of alien species (Daphnia magna and Simocephalus exspinosus) and aboriginal species (Daphnia hyalina and Diaphanosoma brachyurum). The results show that competition is a factor preventing the introduction of weak competitors, such as D. magna, but admitting stronger competitors, e.g., S. exspinosus. Competition in the lake may influence not only the species structure of the zooplanktonic community, but also its vertical distribution. 相似文献
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Laboratory experiments and computer simulations have been performed to study the influence of increased temperatures on the
structure of cladoceran communities. Analysis of changes in the rate of population growth and demographic parameters has shown
that smaller cladoceran species are less sensitive to decreased concentrations of food at any of the test temperatures (18,
21, and 27°C). An increase in temperature from 18°C to 27°C has been shown to facilitate the establishment of acute competition
conditions. At 18°C, periods of food deficiency are shorter, and competition is therefore less manifested than at 27°C. According
to the results of computer simulations, alleviation of competition in waters with “low” temperatures results from reduction
of the periods of food deficiency because of prolonged juvenile development. 相似文献
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Competition between several cladoceran species has been studied with the use of simulation. The results have demonstrated that, in most cases, one or two species survive. Under conditions of the minimum food supply, the most competitive species have the selective advantage. With an increase in food supply, the survival of low-competitive species was observed more often. The mean body size of surviving species increases with an increase in food reproduction. 相似文献
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E. G. Sakharova A. V. Krylov V. G. Petrosyan D. G. Seleznev I. Kostshevska-Shlakovska I. Yu. Feniova M. Rzepecki N. S. Zilitinkevich 《Russian Journal of Ecology》2018,49(5):428-433
The bivalve Dreissena polymorpha (Pallas, 1771) was shown to significantly decrease the biomass of cyanoprokaryotes in water collected from Lake Mikolajskoe (Poland) including potentially toxic species Cylindrospermopsis raciborskii (Woloszynska) Seenayya et Subba Raju. However, the mollusks increased the biomass of large filaments of green algae which are of low nutritional quality for zooplankton. 相似文献
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