2018-09-252018-09-251980Экология моря. - 1980. - Т. 1https://repository.marine-research.ru/handle/299011/2727Monthly studies (1976) of 15N in situ showed that in the near-surface water of the Sevastopol bay of the Black Sea there occur processes of heterotrophic and photoautotrophic nitrogen fixation. Their average rates were 2.06 and 1.28 mg N/m3 per day, respectively the average annual level of total nitrogen fixation was 3.34 mg N/m3 per day. The dynamics of the processes was followed during a year. A simultaneous quantitative calculation of nitrogen fixation agents showed that heterotrophic nitrogen fixation oecurs by means of bacteria and spirochaetes abundant in the near-surface water. They are accompanied by flagellated Protozoa feeding on the bacteria cells and spirochaetes gonidia. The blue-green algae were absolutely absent in the region under study during the whole year. It is supposed that the process of photoautotrophic nitrogen fixation was performed by another group of photosynthetizing microorganisms, by photosynthetizing bacteria in particular.Дифференцированно, методом 15N in situ исследовали динамику скоростей гетеротрофной и фотоавтотрофной азотфиксации в приповерхностной воде Севастопольской бухты в 1976 г. Одновременно методом предельных разведений изучали динамику численности азотфиксирующих, олигонитрофильных, денитрифицирующих и сапрофитных бактерий, а также жгутиковых Protozoa, ассоциированных с азотфиксирующими гетеротрофными микроорганизмами. Вскрыт ряд специфических закономерностей в соотношении процессов гетеротрофной и фотоавтотрофной азотфиксации, а также азотфиксации и численности ее агентов.ruЧерное море