Recent cyanobacteria abundance in a large sub-tropical reservoir inferred from analysis of sediment cores
| Autor: | Claudia Gogorza, Andrea Lami, Diego Frau, María Sofía Plastani, Nathalie Dubois, Facundo Bordet, Cecilia Laprida, Paula de Tezanos Pinto, Daniela Gangi |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Cyanobacteria Pigments 010506 paleontology Aquatic Science Photosynthesis 01 natural sciences Paleolimnology purl.org/becyt/ford/1 [https] purl.org/becyt/ford/1.5 [https] Phytoplankton Akinetes Limnoperna fortunei 0105 earth and related environmental sciences Earth-Surface Processes Reservoir biology Primary producers Ecology PALEOLIMNOLOGY 010604 marine biology & hydrobiology fungi Sediment Biota CYANOBACTERIA PIGMENTS biology.organism_classification RESERVOIR AKINETES |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET Journal of paleolimnology 63 (2020): 195–209. doi:10.1007/s10933-020-00110-8 info:cnr-pdr/source/autori:Gangi, Daniela; Plastani, María Sofía; Laprida, Cecilia; Lami, Andrea; Dubois, Nathalie; Bordet, Facundo; Gogorza, Claudia; Frau, Diego; de Tezanos Pinto, Paula/titolo:Recent cyanobacteria abundance in a large sub-tropical reservoir inferred from analysis of sediment cores/doi:10.1007%2Fs10933-020-00110-8/rivista:Journal of paleolimnology/anno:2020/pagina_da:195/pagina_a:209/intervallo_pagine:195–209/volume:63 |
| Popis: | 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. Fil: Gangi, Daniela. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina Fil: Plastani, María Sofía. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina Fil: Laprida, Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina Fil: Lami, Andrea. Centre National de la Recherche Scientifique; Francia Fil: Dubois, Nathalie. No especifíca; Fil: Bordet, Facundo. No especifíca; Fil: Gogorza, Claudia Susana. Universidad Nacional del Centro de la Provincia de Buenos Aires. Centro de Investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil. Centro de Investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires. - Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires; Argentina Fil: Frau, Diego. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; Argentina Fil: de Tezanos Pinto, Paula. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Botánica Darwinion. Academia Nacional de Ciencias Exactas, Físicas y Naturales. Instituto de Botánica Darwinion; Argentina |
| Databáze: | OpenAIRE |
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