| Summary: | Trabajo final presentado por Francesc Torrent Llagostera para el grado de Bioloquímica de la Universitat de Barcelona (UB), realizado bajo la dirección de la Dra. Dolors Vaqué del Institut de Ciències del Mar (ICM-CSIC) y del Dr. Miquel Salicrú de la Universitat de Barcelona (UB).-- 42 pages, 22 figures, 3 tables, annexes This project (TFG) was carried out at the Institute of Marine Sciences of Barcelona (ICM/CSIC) in the Marine Biology and Oceanography group.The TFG has been assigned to the research project ATOS: “Atmospheric inputs of organic carbon and pollutants to the polar ocean: rates, significance and Outlook” (IP. Dr. Carlos Duarte, KAUST) which aims to solve the growing role of the exchange of matter and energy in the polar oceans and atmosphere. Fromthe ATOS-2 cruise, I took part in the processing of samples and analysis of data. Three geographic areas were visited in the Antarctic peninsula: Bellingshausen Sea, Bransfield Strait and Weddel Sea. Sea Water samples were taken at different depths (from 0,001 m to 100 m) to determine virus, bacterial and protist abundance, and the activities of these microorganisms (viral production and bacteria lproduction and mortality due to viruses and protists). The main goal of the TFG is to determine how the distribution of the virus abundance and microbial activities changes in different geographic areas of the Antarctica, and also to compare whether protists or viruses in these areas mainly cause bacterial mortality rates. This will give a general view of the functioning of the microbial food webs in the sampled regions. We observed that temperature, salinity, bacterial and viral abundance was significantly lower in the Weddel Sea than in the other two areas, while units of fluorescence as a proxy of phytoplankton biomass showed the highest values in the Weddel Sea. When comparing mortality rates protits grazing rates dominated in the Weddel Sea, rates of lysed cells due to viruses was higher than protists grazing rates in the Bellingshausen Sea. These results ...
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