SEASONAL AND INTER-ANNUAL CHANGES IN THE NUMBER OF BACTERIOPLANKTON IN THE ARGENTINE ISLANDS AREA, ANTARCTICA
Keywords:
bacterioplankton, number, biomass, seasonal changes, year-to-year variations, the long-standing trendAbstract
For the first time the results of the examinations of the bacterioplankton abundance for the region of Ukrainian Antarctic station Academic Vernadsky (former British station Faraday) are represented for the different temporary scales - seasonal and long-standing. General laws governing the seasonal changes of the number of planktonic bacteria in the region being investigated were characterized by minimum values in the late winter period (July - September), by growth on an order in the spring-summer time and with the values of number, close to the average annual, into the autumnal season (March - May). The observed variations in the seasonal changes were manifested in presence - absence of the sharp growth of number in the spring period, connected with the manifestation of Phaeocystis pouchetii bloom; in the duration of the winter period of the lowered bacterial number and their average values. The long-term trend of changeability was characterized by the expressed total reduction in the values of the bacteria number. The ratio of biomasses of bacterio- and phytoplankton, on the contrary, showed stable type in the investigated period.
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