Ecological status assessment of tropical reservoirs through the assemblage index of phytoplankton functional groups

The study assessed the ecological status of water supply reservoirs with different trophic states through the phytoplankton assemblage index (Q index). Integrated water and phytoplankton sampling were collected in euphotic zone of five tropical reservoirs (Upper Tietê river basin, São Paulo, Brazil)...

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Bibliographic Details
Published in:Revista brasileira de botânica 2017-09, Vol.40 (3), p.695-704
Main Authors: Santana, Lucineide Maria, Crossetti, Luciane Oliveira, Ferragut, Carla
Format: Article
Language:English
Subjects:
Biomass
Biomedical and Life Sciences
Botany
Ecological conditions
Ecological effects
Ecological monitoring
Euphotic zone
Eutrophic environments
Eutrophic waters
Eutrophication
Functional groups
Life Sciences
Original Article
Phytoplankton
Plankton
Plant Systematics/Taxonomy/Biogeography
Reservoirs
River basins
Rivers
Water supply
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Summary:The study assessed the ecological status of water supply reservoirs with different trophic states through the phytoplankton assemblage index (Q index). Integrated water and phytoplankton sampling were collected in euphotic zone of five tropical reservoirs (Upper Tietê river basin, São Paulo, Brazil) in the summer and winter (2010). Biovolume of functional groups was determined, and the Q index was applied at each site of the reservoirs. The composition of functional groups and biomass changed between the reservoirs and between the climatic periods. From upstream to downstream of the basin, the reservoirs showed the following qualification: Ribeirão do Campo (ultra-oligotrophic—excellent to good), Ponte Nova (oligotrophic—good), Paraitinga (mesotrophic—medium), Jundiaí (meso-eutrophic—medium to tolerable), Taiaçupeba (mesotrophic—tolerable to bad). Q index was significantly correlated with trophic state index ( r  = −0.81). Linear regression showed that Q index tended to decrease with the increasing in TP concentration. We conclude that the phytoplankton assemblage index showed consistently the spatial and temporal variation of the ecological status of different reservoirs in the study period. Our results evidenced that this biotic index can be a useful tool for monitoring and assessment of the ecological conditions of tropical reservoirs.
ISSN:0100-8404
1806-9959
DOI:10.1007/s40415-017-0373-4