Changes in the phytoplankton structure in a Pampean shallow lake in the transition from a clear to a turbid regime
We analysed the changes in phytoplankton and in the main limnological features in a shallow lake during its transition from a clear-vegetated regime to a turbid one from 2005 to 2013. As samplings were discontinuous, data were analysed considering three different sampling periods. At the beginning o...
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todo:paper_00188158_v752_n1_p65_Sanchez2023-10-03T14:16:09Z Changes in the phytoplankton structure in a Pampean shallow lake in the transition from a clear to a turbid regime Sánchez, M.L. Lagomarsino, L. Allende, L. Izaguirre, I. Macrophytes Pampean plain Phytoplankton Shallow lakes Shift regimes abundance chlorophyll a hydrometeorology lake limnology macrophyte phytoplankton population density population structure shallow water turbidity water column Argentina Pampas We analysed the changes in phytoplankton and in the main limnological features in a shallow lake during its transition from a clear-vegetated regime to a turbid one from 2005 to 2013. As samplings were discontinuous, data were analysed considering three different sampling periods. At the beginning of the first period, the lake was in a clear-vegetated regime, showing low values of chlorophyll a, Kd<inf>PAR</inf>, total suspended solids and nutrients, and high Secchi depth. Phytoplankton was dominated by nano-phytoplanktonic species. During the second period, some evidences of the shift to a turbid regime were observed (mainly in Kd<inf>PAR</inf> and total suspended solids). Towards the end of our study, submerged macrophytes sharply declined; in this period Kd<inf>PAR</inf> and total suspended solids noticeably increased, whereas a significant reduction in Secchi depth occurred. Concomitantly, phytoplankton abundance augmented in two orders of magnitude, changing to a community with a higher proportion of micro-phytoplankton. Although the causes of the regimen shift could not be unequivocally assessed, the drastic reduction in the hydrometric level of the lake probably provoked a declination in macrophytes, with the consequent increase of nutrients in the water column and the increment in phytoplankton densities, carrying the system towards a turbid regime. © 2014, Springer International Publishing Switzerland. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00188158_v752_n1_p65_Sanchez |
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Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Macrophytes Pampean plain Phytoplankton Shallow lakes Shift regimes abundance chlorophyll a hydrometeorology lake limnology macrophyte phytoplankton population density population structure shallow water turbidity water column Argentina Pampas |
| spellingShingle |
Macrophytes Pampean plain Phytoplankton Shallow lakes Shift regimes abundance chlorophyll a hydrometeorology lake limnology macrophyte phytoplankton population density population structure shallow water turbidity water column Argentina Pampas Sánchez, M.L. Lagomarsino, L. Allende, L. Izaguirre, I. Changes in the phytoplankton structure in a Pampean shallow lake in the transition from a clear to a turbid regime |
| topic_facet |
Macrophytes Pampean plain Phytoplankton Shallow lakes Shift regimes abundance chlorophyll a hydrometeorology lake limnology macrophyte phytoplankton population density population structure shallow water turbidity water column Argentina Pampas |
| description |
We analysed the changes in phytoplankton and in the main limnological features in a shallow lake during its transition from a clear-vegetated regime to a turbid one from 2005 to 2013. As samplings were discontinuous, data were analysed considering three different sampling periods. At the beginning of the first period, the lake was in a clear-vegetated regime, showing low values of chlorophyll a, Kd<inf>PAR</inf>, total suspended solids and nutrients, and high Secchi depth. Phytoplankton was dominated by nano-phytoplanktonic species. During the second period, some evidences of the shift to a turbid regime were observed (mainly in Kd<inf>PAR</inf> and total suspended solids). Towards the end of our study, submerged macrophytes sharply declined; in this period Kd<inf>PAR</inf> and total suspended solids noticeably increased, whereas a significant reduction in Secchi depth occurred. Concomitantly, phytoplankton abundance augmented in two orders of magnitude, changing to a community with a higher proportion of micro-phytoplankton. Although the causes of the regimen shift could not be unequivocally assessed, the drastic reduction in the hydrometric level of the lake probably provoked a declination in macrophytes, with the consequent increase of nutrients in the water column and the increment in phytoplankton densities, carrying the system towards a turbid regime. © 2014, Springer International Publishing Switzerland. |
| format |
JOUR |
| author |
Sánchez, M.L. Lagomarsino, L. Allende, L. Izaguirre, I. |
| author_facet |
Sánchez, M.L. Lagomarsino, L. Allende, L. Izaguirre, I. |
| author_sort |
Sánchez, M.L. |
| title |
Changes in the phytoplankton structure in a Pampean shallow lake in the transition from a clear to a turbid regime |
| title_short |
Changes in the phytoplankton structure in a Pampean shallow lake in the transition from a clear to a turbid regime |
| title_full |
Changes in the phytoplankton structure in a Pampean shallow lake in the transition from a clear to a turbid regime |
| title_fullStr |
Changes in the phytoplankton structure in a Pampean shallow lake in the transition from a clear to a turbid regime |
| title_full_unstemmed |
Changes in the phytoplankton structure in a Pampean shallow lake in the transition from a clear to a turbid regime |
| title_sort |
changes in the phytoplankton structure in a pampean shallow lake in the transition from a clear to a turbid regime |
| url |
http://hdl.handle.net/20.500.12110/paper_00188158_v752_n1_p65_Sanchez |
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