Ecosystem of Broa reservoir, Sao Paulo State, Brazil, as described using ECOPATH
1996
Angelini, R. | Petere, M. Jr.
In this paper, a model was constructed using the ECOPATH software, to describe Broa reservoir, Sao Paulo State, Brazil, in terms of materials or energy flow that the organisms (compartments) interchange. This reservoir was chosen since it is probably the best-known reservoir in Brazil. The eleven compartments of this model are: phytoplankton; macrophytes; detritus; periphyton; zooplankton; benthos and fish; Astyanax fasciatus; Geophagus brasiliensis; Gymnotus carapo; Leporinus spp and Hoplias malabaricus. The results show that phytoplankton is the primary producer most used as a food source; there is a little cycling of nutrients; total primary production, is 40 times greater than total system respiration; there is an accumulation of detritus in the environment; and Broa reservoir is an ecosystem still under development, in terms of its ascendency and overhead. Moreover, one notes that there is a lack of information about the fish community at the reservoir. One should emphasize, however, that it is perfectly possible to construct reasonable mathematical models based only on published data and parameter estimates
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