Abstract
Salto Grande is a large South American reservoir on the border between Uruguay and Argentina that was impounded in 1979 and experiences recurrent, massive cyanobacteria blooms. A water-monitoring program was initiated 20 years after the dam was built, hence the causes and onset of cyanobacteria blooms remain poorly known. We collected two sediment cores from the old river channel in the reservoir (z = 17 m) and used physical, chemical and biological variables in the sediments, along with existing limnological data, to explore the history of cyanobacteria in the sub-tropical water body. Cyanobacteria fossil pigments were present at low concentrations during the first 24 years after impoundment, but more than doubled thereafter. Phytoplankton abundance tracked shifts in cyanobacteria pigment concentration, indicating an overall increase in all primary producers. Several sediment variables indicate a decline in water quality after 2003, such as increases in the number of photosynthetic sulfur bacteria and a reduction in sediment magnetic susceptibility. Akinetes (dormant cyanobacteria cells, Order Nostocales) in recent reservoir deposits were abundant and five species germinated under laboratory conditions, underscoring the ability of akinetes to initiate cyanobacteria blooms. The germinated assemblage reflected closely the composition of cyanobacteria blooms in the reservoir. Recorded increases in air temperature and decreases in wind speed, together with other variables (e.g. nutrients), can promote the large, recurrent cyanobacteria blooms. Invasion of the bivalve Limnoperna fortunei apparently promoted cyanobacteria blooms by preferential feeding on other phytoplankton taxa, and perhaps by altering nutrient concentrations and ratios. This work highlights the potential for using multiple variables in sediment cores from large reservoirs to better understand the responses of biota to multiple environmental stressors.
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Acknowledgements
DG acknowledges a grant from the Comisión Administradora del Río Uruguay (CARU) and PTP acknowledges funding from PIP 0236 (CONICET). We are grateful to the Comisión Técnica Mixta de Salto Grande for providing: (1) financial assistance to date the sediments, (2) the boat for sampling, and (3) historical data on water flow and water depth. We thank the Instituto Nacional de Tecnología Agropecuaria (INTA) for providing historical data on rainfall, wind speed and air temperature. We are grateful to Allyson Hutchens for language revision. We thank the Editor and two anonymous reviewers for their feedback and comments, which improved our work.
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Gangi, D., Plastani, M.S., Laprida, C. et al. Recent cyanobacteria abundance in a large sub-tropical reservoir inferred from analysis of sediment cores. J Paleolimnol 63, 195–209 (2020). https://doi.org/10.1007/s10933-020-00110-8
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DOI: https://doi.org/10.1007/s10933-020-00110-8