Effect of CO2, nutrients and light on coastal plankton. II. Metabolic rates
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AuthorsMercado-Carmona, J.M. (Jesús Mariano); Sobrino, C.; Neale, P.J.; Segovia, M.; Reul, A.; Amorim, A.L.; Carrillo, P.; Claquin, P.; Cabrerizo, M.J.; León, P.; Lorenzo, M.R.; Medina-Sánchez, M.J.; Montecino, V; Napoleon, C; Prasil, O.; Putzeys, S.; Salles, S.; Yebra, L. (Lidia)
KeywordsAcidification · Bacterioplankton · Nutrients · Phytoplankton · Primary productivity · Respiration · UVR
We conducted a microcosm experiment aimed at studying the interactive effects of high CO2, nutrient loading and irradiance on the metabolism of a planktonic community sampled in the Western Mediterranean near the coast of Málaga. Changes in the metabolism of phytoplankton and bacterioplankton were observed for 7 d under 8 treatment conditions, representing the full factorial combinations of 2 levels each of CO2, nutrient concentration and solar radiation exposure. The initial plankton sample was collected at the surface from a stratified water column, indicating that phytoplankton were naturally acclimated to high irradiance and low nutrient concentrations. Nutrient addition combined with high irradiance resulted in a significant increase in primary production. Nitrate uptake by phytoplankton was also stimulated under high nutrient conditions. High nutrients, high irradiance and the combination of low CO2 and high irradiance positively affected bacterial production. Light was ...
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