Intraspecific variability in response to phosphorus depleted conditions in the cyanobacteria Microcystis aeruginosa and Raphidiopsis raciborskii |
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| Institution: | 1. Carlos Chagas Filho Biophysics Institute, Federal University of Rio de Janeiro, Rio de Janeiro 21949-902, Brazil;2. Federal University of Juiz de Fora, Juiz de Fora, MG 36036-900, Brazil;3. Laboratory of Ecology and Physiology of Phytoplankton, Department of Plant Biology, University of Rio de Janeiro State, Rua São Francisco Xavier 524—PHLC Sala 511a, 20550-900, Rio de Janeiro, Brazil;4. Aquatic Ecology & Water Quality Management Group, Department of Environmental Sciences, Wageningen University, P.O. Box 47, 6700 AA, Wageningen, the Netherlands;5. Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), P.O. Box 50, 6700 AB, Wageningen, the Netherlands;1. Australian Rivers Institute, Griffith University, 170 Kessels Road, Nathan, Queensland 4111, Australia;2. School of Environment, Griffith University, 170 Kessels Road, Nathan, Queensland 4111, Australia;1. Australian Rivers Institute, Griffith University, QLD, Australia;2. School of Biotechnology and Biomolecular Sciences, University of New South Wales, NSW, Australia;3. School of Environmental and Life Sciences, The University of Newcastle, NSW, Australia;4. Faculty of Veterinary and Agricultural Sciences, University of Melbourne, VIC, Australia;5. Population Health and Immunity Division, Walter and Eliza Hall Institute of Medical Research, Melbourne, VIC, Australia;1. University of Adelaide, School of Biological Sciences, Adelaide, Australia;2. Israel Oceanographic and Limnological Research, Kinneret Limnological Laboratory, Migdal, Israel;3. Brandenburg University of Technology, Department of Freshwater Conservation, Bad Saarow, Germany;4. Seqwater, Brisbane, Australia;5. Federal University of the State of Rio de Janeiro, Rio de Janeiro, Brazil;1. Department of Biology and Environmental Protection, Poznan University of Medical Sciences, Poznań, Poland;2. Department of Hydrobiology, Faculty of Biology, Adam Mickiewicz University, Poznań, Poland;3. Department of Applied Ecology, Faculty of Biology and Environmental Protection, University of Łódź, Łódź, Poland;4. Poznan University of Medical Sciences, Poznań, Poland;5. Collegium Polonicum, Faculty of Biology, Adam Mickiewicz University, Słubice, Poland |
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| Abstract: | Phosphorus loading plays an important role in the occurrence of cyanobacterial blooms and understanding how this nutrient affects the physiology of cyanobacteria is imperative to manage these phenomena. Microcystis aeruginosa and Raphidiopsis raciborskii are cyanobacterial species that form potentially toxic blooms in freshwater ecosystems worldwide. Blooms comprise numerous strains with high trait variability, which can contribute to the widespread distribution of these species. Here, we explored the intraspecific variability in response to phosphorus depleted conditions (P-) testing five strains of each species. Strains could be differentiated by cell volume or genetic profiles except for those of the same species, sampling location and date, though these presented differences in their response to (P-). Although differently affected by (P-) over 10 days, all strains were able to grow and maintain photosynthetic activity. For most M. aeruginosa and R. raciborskii strains growth rates were not significantly different comparing (P+) and (P-) conditions. After ten days in (P-), only one M. aeruginosa strain and two R. raciborskii strains showed reduction in biovolume yield as compared to (P+) but in most strains chlorophyll-a concentrations were lower in (P-) than in (P+). Reduced photosystem II efficiency was found for only one R. raciborskii strain while all M. aeruginosa strains were affected. Only two M. aeruginosa and one R. raciborskii strain increased alkaline phosphatase activity under (P-) as compared to (P+). Variation in P-uptake was also observed but comparison among strains yielded homogeneous groups comprised of representatives of both species. Comparing the response of each species as a whole, the (P-) condition affected growth rate, biovolume yield and chlorophyll yield. However, these parameters revealed variation among strains of the same species to the extent that differences between M. aeruginosa and R. raciborskii were not significant. Taken together, these results do not support the idea that R. raciborskii, as a species, can withstand phosphorus limitation better than M. aeruginosa and also point that the level of intraspecific variation may preclude generalizations based on studies that use only one or few strains. |
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| Keywords: | Ecotypes Phosphorus uptake Strain variability Cylindrospermopsis |
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