Composição e distribuição (espacial e temporal) de macrófitas aquáticas no reservatório do Lobo (Broa), Itirapina/Brotas, SP / Composition and distribution (spatial and temporal) of aquatic macrophytes in the Lobo reservoir (Broa), Itirapina/Brotas, Brazil

AUTOR(ES)

Danieli Delello

DATA DE PUBLICAÇÃO

2008

RESUMO

The objective of this study was to examine the composition and distribution of aquatic macrophytes species in the Lobo reservoir (Broa) in four periods of the year 2007: March, May, August and November. To achieve the proposed objectives, limnological variables involving water (pH, conductivity, temperature, dissolved oxygen, chlorophyll, nitrogen and phosphated forms and reactive silicate) and sediment (grain, organic matter, phosphorus and nitrogen) compartments were analyzed at 8 sample stations in the littoral region of the reservoir. Meanwhile, samples of macrophytes were photographed and collected for identification, seeking a relationship with the limnological, hydrological (flow and length of residence time) and weather (air temperature, precipitation, wind and radiation) characteristics. The results of physical, chemical and biological variables of the various sample points showed that there is a spatial and temporal differentiation in the reservoir, verifying the increasing of the trophic levels in relation to previous studies. As to the composition and distribution of macrophytes, they are more concentrated in the flooded area formed by the barred waters of Itaqueri river and Lobo river, although the greatest wealth of species has occurred in Lobo river and Perdizes, being higher compared with earlier studies. The spatial and temporal distribution of aquatic macrophytes presents relationship with the morphometric and hydrodynamic characteristics and intake of nutrients by the rivers, in addition to climatic conditions, which inserts changes in the dynamics of the reservoir and, consequently, the establishment and structure of communities.

ASSUNTO(S)

eutrophication eutrofização reservatório do lobo lobo reservoir aquatic macrophytes macrófitas aquáticas

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