| Full text | |
| Author(s): |
Ana Margarita Loaiza-Restano
[1]
;
Gisele Carolina Marquardt
[2]
;
Carla Ferragut
[3]
;
Carlos Eduardo de Mattos Bicudo
[4]
Total Authors: 4
|
| Affiliation: | [1] Núcleo de Pesquisa em Ecologia, Instituto de Botânica - Brasil
[2] Núcleo de Pesquisa em Ecologia, Instituto de Botânica - Brasil
[3] Núcleo de Pesquisa em Ecologia, Instituto de Botânica - Brasil
[4] Núcleo de Pesquisa em Ecologia, Instituto de Botânica - Brasil
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | Acta Limnol. Bras.; v. 32, 2020-07-01. |
| Abstract | |
Abstract: Aim Structural changes in phytoplankton was evaluated in one ultraoligotrophic and two oligotrophic cascading reservoirs during two climatic periods (austral winter and summer) of 2014. Changes in phytoplankton biomass, species composition, and codons (functional groups) were evaluated along a vertical and a longitudinal profile. Methods Four sampling sites were selected for the first reservoir in the cascade (Cachoeira do França) and three for each of the other two reservoirs (Cachoeira da Fumaça and Serraria). Samples were collected along a vertical and a longitudinal profile. Species biomass and codons ‘sensu’ Reynolds were identified and expressed in terms of biomass. Results 18 codons were identified and associated to the reservoirs’ limnological conditions. Composition and biomass of descriptor species changed among seasons. Codon B consisting mainly of Discostella stelligera was the most frequent in all reservoirs in both climatic seasons. Conclusions Our findings showed that seasonality was the key factor for the species composition and phytoplankton codons changes. However, the cascade effect on phytoplankton structure was shown by the continuous contribution of Ceratium furcoides (codon LM) during the winter, and of Discostella stelligera (codon B) in both sampling periods in all three reservoirs. (AU) | |
| FAPESP's process: | 09/53898-9 - Paleolimnological reconstruction of Guarapiranga Reservoir and diagnosis of water and sediment current quality of SPMR water supply reservoirs facing their management |
| Grantee: | Carlos Eduardo de Mattos Bicudo |
| Support Opportunities: | Research Projects - Thematic Grants |