naa a22 4500 510765173 CHVBK 20180411083154.0 cr unu---uuuuu 180411e20130501xx s 000 0 eng 10.1134/S0001437013030089 doi (NATIONALLICENCE)springer-10.1134/S0001437013030089 Heterotrophic microbial communities on the water-sediment boundary in the Kara Sea [Elektronische Daten] [N. Romanova, Yu. Mazei, D. Tikhonenkov, A. Sazhin, A. Azovsky] The qualitative and quantitative characteristics of the heterotrophic microbial communities (bacteria, flagellates, and ciliates) in the thin water-sediment layer in the Kara Sea are analyzed. The bacterial abundance correlated with the concentration of organic matter, whereas their size depended on the abundance of heterotrophic flagellates. The number of species of heterotrophic flagellates increased with the increase in the bacterial number. A positive relationship between the bacterial abundance and the ration of heterotrophic flagellates was observed at the offshore stations, probably due to the grazing pressure. The density of the ciliates on the soft silty and sandy-silty sediments was extremely low. The share of upstream filter feeding ciliate species increased with the increase in the abundance of the flagellates, probably due to the shift to less selective feeding strategies at higher values of the food concentrations. The classification of the heterotrophic microbial communities in the surface sediment layer has revealed two distinct types of the communities. The river communities are rich in species and are characterized by the high abundance of microorganisms. They are gradually replaced by marine communities at the salinity of 9%. Pleiades Publishing, Ltd., 2013 Romanova N. Shirshov Institute of Oceanology, pr. Nakhimovski 36, 117997, Moscow, Russia aut Mazei Yu Penza State University, ul. Krasnaya 40, 440017, Penza, Russia aut Tikhonenkov D. Institute for Biology of Inland Waters, Russian Academy of Sciences, 152742, Borok, Nekouzskii raion, Yaroslavl oblast, Russia aut Sazhin A. Shirshov Institute of Oceanology, pr. Nakhimovski 36, 117997, Moscow, Russia aut Azovsky A. Faculty of Biology, Moscow State University, 119991, Moscow, Russia aut Oceanology SP MAIK Nauka/Interperiodica 53/3(2013-05-01), 334-344 0001-4370 53:3<334 2013 53 11491 https://doi.org/10.1134/S0001437013030089 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S0001437013030089 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Romanova N. Shirshov Institute of Oceanology, pr. Nakhimovski 36, 117997, Moscow, Russia aut NATIONALLICENCE 700 1- Mazei Yu Penza State University, ul. Krasnaya 40, 440017, Penza, Russia aut NATIONALLICENCE 700 1- Tikhonenkov D. Institute for Biology of Inland Waters, Russian Academy of Sciences, 152742, Borok, Nekouzskii raion, Yaroslavl oblast, Russia aut NATIONALLICENCE 700 1- Sazhin A. Shirshov Institute of Oceanology, pr. Nakhimovski 36, 117997, Moscow, Russia aut NATIONALLICENCE 700 1- Azovsky A. Faculty of Biology, Moscow State University, 119991, Moscow, Russia aut NATIONALLICENCE 773 0- Oceanology SP MAIK Nauka/Interperiodica 53/3(2013-05-01), 334-344 0001-4370 53:3<334 2013 53 11491 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer