Photosynthetic responses of phytoplankton from high-mountain lakes to the combined impact of vertical mixing, UVR, CO2 and nutrients: A transplant experiment.

CABRERIZO, M.; REDONDO-HASSELERHAM, P; CARRILLO, P.; VILLAFAÑE, V. E.; MEDINA-SÁNCHEZ, J. M.; HELBLING, E. W.

Granada

Congreso; Aquatic Sciences Meeting, Association for the Sciences of Limnology and Oceanography; 2015

ASLO

Global climate change is a complex process that cause alterations in severalphysicochemical variables that impact directly or indirectly on organisms and aquaticecosystems around the world. A transplant experiment was carried out to assess theshort-term (hours) combined effects of increases in CO2 concentrations, nutrient, UVRlevels, and vertical mixing on photosynthesis of natural phytoplankton communitiesfrom high-mountain lakes with different previous light-histories.Our results show a net UVR-inhibition in all conditions and transplanted phytoplanktoncommunities, ranging from 30% to 80%. However, under vertical mixing and increasedconditions of CO2, nutrient inputs and UVR, communities with previous high-UVRhistory exhibited higher inhibition of photosynthesis than others. These differentialshort-term response capacity of organisms was mainly related to the different previouslight-history that cells has in their ambient lakes.