Em sistemas aquáticos continentais é comum a coexistência de espécies que possuem as mesmas necessidades ecológicas e apresentam as mesmas tolerâncias ambientais, tais grupos de espécies fitoplanctônicas são denominados grupos funcionais. Phytoplankton descriptor species functional groups water supplyĪ comunidade fitoplanctônica pode funcionar como sensor das variações do ambiente aquático respondendo rapidamente as essas alterações. The environmental factors that most influenced the phytoplankton dynamics were water temperature, euphotic zone, turbidity, conductivity, pH, dissolved oxygen, nitrate and total phosphorous. and Komárek (S1) in the Billings reservoir.
(L M/M), Planktothrix agardhii (Gom.) Anagn. and Subba Raju (S N), Microcystis aeruginosa and M. (T) in the Guarapiranga reservoir and Cylindrospermopsis raciborskii (Wolosz.) Seen. (H1), Microcystis aeruginosa (Kützing) Kützing (L M/M) and Mougeotia sp. The highest biovolume (mm³.L-1) of the descriptor species and functional groups were represented respectively by Anabaena circinalis Rabenh. Surface water samples were collected monthly and physical, chemical and biological (quantitative and qualitative analyses of the phytoplankton) were performed. Thus, the aim of this study was to evaluate the occurrence of functional groups of phytoplankton in two reservoirs (Billings and Guarapiranga) that supply water to millions of people in São Paulo city Metropolitan Area, southeastern Brazil.
The use of phytoplankton functional groups to evaluate these changes has proven to be very useful and effective. In freshwaters, coexistence of species that have similar ecological requirements and show the same environmental requirements frequently occurs such species groups are named functional groups. Phytoplankton may function as a "sensor" of changes in aquatic environment and responds rapidly to such changes.
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