Cambios en las comunidades de microorganismos marinos antárticos en aguas superficiales y hielo marino

• Main Author: García Botín, César
• Other Authors: Vaqué, Dolors, Sotomayor Garcia, Ana
• Format: Master Thesis
• Language: unknown
• Published: Universidad de Barcelona 2019
• Subjects: Antarctic; Antarctic Peninsula; Austral; Base Juan Carlos I; Hielo; The Antarctic; Vidal; Antarc*; Sea ice
• Online Access: http://hdl.handle.net/10261/203871; https://doi.org/10.20350/digitalCSIC/12617

Trabajo final presentado por César García Botín para el Máster en Oceanografía y Gestión del Medio Marino de la Universitat de Barcelona (UB), realizado bajo la dirección de la Dra. Dolors Vaqué Vidal del Institut de Ciències del Mar (ICM-CSIC) y de la Dra. Ana Sotomayor García.-- 27 pages, 9 figures, 1 table [EN] This study is part of the PI-ICE cruise, which was carried out along the Antarctic Peninsula in the austral summer 2019. Its purpose was to describe the regional microbial community and relate it to aerosol production for cloud formation. This was divided into two phases: a transect aboard the oceanographic research vessel BIO-Hesperides sampling surface water (SW) and microlayer (SML); and the second one, an experimental approach, at the Antarctic base Juan Carlos I (BAE). From sea ice, we checked how the microorganisms living in there react once they are released in the water column and are subject to stirring processes, to relate them to the production of aerosols. For this, we described the microbial community determining the abundance, biomass and composition of phototrophic (PNF) and heterotrophic (HNF) nanoflagellates. Indeed, the concentration of chlorophyll a, abundances of bacteria and viruses was evaluated, and temperature and salinity data were included. The results showed that the abundances of microorganisms were higher in the SML than in the SW, although differences were not significant. However, PNF and HNF had significantly lower abundances and biomasses in the transect than in waters around the BAE, where a proliferation of Phaeocystis (PNF) producers of aerosol precursors was detected, as well as an increase in their specific viruses. Bacterial abundance was significantly correlated with viruses and not with HNF, which suggested that viruses were more important in regulating its abundances than HNF. Finally, the dynamics of the microbial communities from the melted sea ice, was different according to the initial communities and it is necessary to have more results from the PI-ICE ...