Pereira, R.H.G. (2003). Análise da distribuiçao, densidade e diversidade de Copepoda Calanoida e Cyclopoida nos reservatórios e tributários do médio e baixo rio Tietê e sua relaço com as características limnológicas do sistema. [Analysis of the distribution, density and diversity of Copepoda Calanoida and Cyclopoida in the reservoirs and tributaries of the middle and lower Tietê River and their relationship with the limnological characteristics of the system.]. Tese de Doutoramento, Núcleo de Estudos em Ecossistemas Aquáticos (NEEA), Escola de Engenharia de Sao Carlos, Universidade de So Paulo, Sao Carlos, Brazil. 289 pp. (Portuguese).

107616

Pereira, R.H.G.

2003

289 pp. (Portuguese)

Publication

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This research project was developed in Tietê River reservoirs and tributaries, São Paulo, Brazil, aiming to evaluate the composition, distribution and density of Copepoda Calanoida and Cyclopoida species and its relationship with reservoirs disposition in Tietê River, built in series (cascade), which present differences in morphometry, flood period and area, trophic level (related to the hydrographic basin uses and occupation), discharge and water residence time. For that, collections were accomplished in reservoirs and tributaries on February, May, July and October/2000, quantifying the main physical, chemical and biological variables, besides qualitative and quantitative zooplankton analysis, with emphasis in Copepoda Calanoida and Cyclopoida. Results demonstrate that, in spite of the improvement of water quality verified downstream reservoirs, it still happen punctual tributary contributions, diffused due to activities developed in the hydrographic basin, increasing nitrogenous and phosphate forms concentration, influencing directly the reservoir trophic conditions and, consequently, composition of species, density and distribution. Reservoirs are classified as eutrophic or mesotrophic (depending on its location in Tietê River and sazonality) and the rivers as eutrophic, due mainly to the high phosphorus and chlorophyll concentrations. In relation to the zooplankton community, Copepoda and Rotifera were the most abundant, with spacial and seasonal variationrelated to trophic conditions and temperature, as well as to the barrier differentiated operational control mechanisms (discharge and water residence time). The Copepoda species found in the system were Notodiaptomus iheringi, Notodiaptomus evaldus, Notodiaptomus deitersi, Argyrodiaptomus azevedoi, Thermocyclops decipiens, Thermocyclops minutus, Thermocyclops inversus, Mesocyclops longisetus, Mesocyclops brasilianus, Mesocyclops meridianus, Mesocyclops ogunus, Acanthocyclops ogunus and Paracyclops chiltoni; being N. iheringi, N. evaldus, T. decipiens and T. minutus the dominant species, with differences in the distribution and abundance in function of the sampling places (tributaries or reservoirs) and collection period (sazonality).

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