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...
Guardado en:
| Publicado: |
2015
|
|---|---|
| Materias: | |
| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00188158_v752_n1_p65_Sanchez http://hdl.handle.net/20.500.12110/paper_00188158_v752_n1_p65_Sanchez |
| Aporte de: |
| id |
paper:paper_00188158_v752_n1_p65_Sanchez |
|---|---|
| record_format |
dspace |
| spelling |
paper:paper_00188158_v752_n1_p65_Sanchez2023-06-08T14:39:58Z Changes in the phytoplankton structure in a Pampean shallow lake in the transition from a clear to a turbid regime 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. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00188158_v752_n1_p65_Sanchez http://hdl.handle.net/20.500.12110/paper_00188158_v752_n1_p65_Sanchez |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
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 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. |
| 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 |
| publishDate |
2015 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00188158_v752_n1_p65_Sanchez http://hdl.handle.net/20.500.12110/paper_00188158_v752_n1_p65_Sanchez |
| _version_ |
1768545769529278464 |