Kovalevsky Institute of the Biology of the Southern Seas

Sevastopol, Russia

Kovalevsky Institute of the Biology of the Southern Seas

Sevastopol, Russia
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Soldatov A.A.,Kovalevsky Institute of the Biology of the Southern Seas | Kukhareva T.A.,Kovalevsky Institute of the Biology of the Southern Seas
Russian Journal of Marine Biology | Year: 2015

The relationship between the contents of abnormal erythroid forms (dacryocytes, nuclear invagi-nation, and erythrocyte ghosts) and the number of immature erythrocytes (pronormoblasts, as well as baso-philic and polychromatophilic normoblasts) was studied in the circulating blood of round gobies. It was found that the proliferative activity of the erythroid branch of blood-forming tissue in this species increases as the gonads mature, i.e., during transition from the III–IV to the V and VI–II stages of gonad maturity. The content of poorly differentiated cells in the blood grew by 26%, while the number of abnormal erythrocytes (dacryocytes and nuclear invagination) decreased by 3 or 4 times (R2 > 0.95). The content of erythrocyte ghosts, in contrast, increased by 80%. When evaluating the toxicity level of the marine environment, not only the number of abnormal erythrocytes in fish blood but also the activity of the blood-forming tissue should be taken into account, as it substantially varies during the spawning period. © Pleiades Publishing, Ltd., 2015.


Finenko G.A.,Kovalevsky Institute of the Biology of the Southern Seas | Abolmasova G.I.,Kovalevsky Institute of the Biology of the Southern Seas | Datsyk N.A.,Kovalevsky Institute of the Biology of the Southern Seas | Anninsky B.E.,Kovalevsky Institute of the Biology of the Southern Seas
Russian Journal of Marine Biology | Year: 2015

This paper studies the qualitative and quantitative food composition of the ctenophore Mnemiopsis leidyi A. Agassiz, 1865, as well as its feeding intensity and predatory impact on selected species of mesoplankton in the inshore waters of the northwestern Black Sea in 2008–2010. Interannual and interspecies differences in the intensity of the predatory impact on zooplankton were found. Copepod nauplii, the cladocerans Penilia avirostris and Pleopis polyphemoides, and bivalve veligers experienced the highest predation pressure. The daily consumption rate for adult copepods did not exceed several percent of their total abundance. The mass development of M. leidyi defines the qualitative and quantitative composition of the zooplankton community through the control of the abundance of copepod nauplii and cladocerans, which, in turn, can result in changes in the trophic structure of the entire food chain. © 2015, Pleiades Publishing, Ltd.

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