Abstract
UV radiation promotes harmful effects on phytoplankton populations, but it is influenced by the degree of sensitivity of different populations to the ultraviolet:photosynthetically active radiation ratio (UVR:PAR), part of which is P-dependent. Given the expected increase of UV radiation along with global change, one may ask if phytoplankton populations are able to adapt to the expectedly higher UVR:PAR ratio. If so, how would phytoplankton communities be affected? The main goal of this study is to answer these questions. Field and laboratory experiments were carried out with phytoplankton populations of an oligotrophic, low altitude lake in Central Spain. No changes were observed in abundance of phytoplankton fractions after UVR removal in the lake. However, autotrophic picoplankton underwent lower growth and contribution to total phytoplankton biomass when UVR increased. Phytoplankton biomass under enhanced UVR was one-third lower than the biomass reached under only PAR. UV-related growth changes were species-specific and linked to cell size and metabolism. An UVR increase would then promote phytoplankton assemblages who resulted from a trade-off between competitive advantages of picoplankton in a P-limited system and selected larger algae. Under these circumstances, the mixotrophic character of these larger species happened to be an evolutionary advantage.
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Acknowledgements
The authors would like to thank the Spanish Ministry of the Environment and Ministry of the Science and Innovation for projects CGL2011-23681 and CGL2009-10292, respectively. This research was also supported by the ‘Consejería de Innovación, Ciencia y Empresa' of the ‘Junta de Andalucía' (Project P07-CVI-02598). We also thank Clara Andrés and Andrea Campos (ICBIBE, University of Valencia, Spain) for their careful assistance in laboratory work. Dr. Mario Sendra (Department of Biostatistics, University of Valencia, Spain) proved the suitability of the statistics used. The English used in the manuscript has been corrected by a native English reviewer of scientific texts.
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Guest editors: N. Salmaso, L. Naselli-Flores, L. Cerasino, G. Flaim, M. Tolotti & J. Padisák / Phytoplankton responses to human impacts at different scales: 16th workshop of the International Association of Phytoplankton Taxonomy and Ecology (IAP)
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Rojo, C., Herrera, G., Rodrigo, M.A. et al. Mixotrophic phytoplankton is enhanced by UV radiation in a low altitude, P-limited Mediterranean lake. Hydrobiologia 698, 97–110 (2012). https://doi.org/10.1007/s10750-012-1214-x
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DOI: https://doi.org/10.1007/s10750-012-1214-x