Dynamics of non-dimensional Richardson, Wedderburn and lake Numbers applied to the neotropical reservoirs Barra Bonita and Carlos Botelho (Broa) –São Paulo- Brazil
NyamienYahaut Sebastien, José Galizia Tundisi, Lais Cristina Batista, Daniella Ventura Nogueira

Abstract
The dynamics of reservoirs biodiversity can be explained by changes in the forces of functions such as climatologic and hydrologic. The aim of the present study was to determine the non-dimensional Wedderburn (W), Richardson (Ri) and Lake Numbers (LN) and their effects on the chemical and biological components of the reservoirs of Barra Bonita and Carlos Botelho (Broa). Previous data were used to show relationships between densimetric parameters biological and chemical data from the two reservoirs. Result showed occurrences of Dinophyceaean Bacillariophycea in summer, Chlorophyceae in winter, Cyanophyceae in autumn and spring, and Euglenophyceae, Cryptophyceae and Phytoflagellates the whole year. Concerning zooplankton, Thermocyclops and Mesocyclops exhibited occurrence in winter and spring. There was a positive correlation between Ri and W numbers and the nutrients. The stratified structure over the year has an influence on the development of some group of phytoplankton and chemical components, consequence of effect of non-dimensional numbers.

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