2026-06-06T05:00:12Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/96552026-02-03T11:50:24Zcom_10630_2254col_10630_37959

Effect of increased CO₂ and iron levels on the marine plankton food web during a mesocosm experiment Segovia, MR Fitoplancton marino Marine biology Mesocosm Iron Co2 Phytoplankton A mesocosm experiment was carried out in the Raunefjord (Norway) during 25 days, to investigate the interactive effects of increased CO₂ and iron availability on the plankton community. The seawater carbonate system in the mesocosms was manipulated to achieve two different CO₂ levels, corresponding to the present (390 ppmv, LC) and to levels predicted for year 2100 (900 ppmv, HC), in combination with ambient and increased dissolved Fe (dFe) concentrations in a full factorial design. We observed a shift in the plankton community structure, initially dominated by picoeukaryotes and small nanoeukaryotes, changing to an <em>Emiliania huxleyi</em> dominated bloom. <em>E. huxleyi</em> and <em>Synechococcus</em> were the most sensitive organisms to changes in CO2 and Fe levels, being negatively affected by increased CO₂ and favoured by high dFe levels. Picoeukaryotes, large nanoplankton, viruses and ciliates abundances were not affected by changes in CO₂ or dFe levels. Bacterial abundance showed a significant positive response to high CO₂ but it was unaffected by dFe. Total mesozooplankton abundances did not change significantly. The relevance of these results within the global change scenario will be discussed. Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech. 2015-04-14T11:38:22Z 2015-04-14T11:38:22Z 2015 2015-04-14 conference output http://hdl.handle.net/10630/9655 eng ASLO2015 Granada, España Febrero 2015 open access application/pdf