DISSOLVED INORGANIC PHOSPHORUS AS TERRESRIAL INPUT INDICATOR IN TWO SECTORS OF CANANÉIA-IGUAPE ESTUARINELA-GOON COMPLEX, BRAZIL

Abstract

This study evaluated the dissolved phosphatedistribution in northern (Iguape) and southern (Cananéia)sectors of an estuarine-lagoon complex. Samples were takenin two seasonal periods (summer-winter, 2009) in 16 pointsincluding samples from Ribeira de Iguape river. Phosphatedata were observed associated to environmental parameterssuch as pH and salinity. In general, the southern sector wasclassified as a haline to mixohaline with salinity and pHincreases to the sea direction. The northern sector wasoligohaline in function of the intense river water inputfacilitate by the Valo Grande, an artificial channel that linksthe river to the internal part of estuary. The phosphateconcentrations were high in the river and at Iguape regionwhen compared to the Cananéia values, whose showed cleargradient of dilution to the sea. During the winter,concentrations of P were higher than summer valuesmaintained the strong anthropic influence at northern part.CNPq 573601/2008-9.Index Terms ⎯ estuary, phosphorus.