Nutrients in surface sediments of Mirim lagoon, Brazil-Uruguay border

• Autor(a) principal: Santos, Isaac Rodrigues dos
• Data de Publicação: 2004
• Outros Autores: Baisch, Paulo Roberto Martins, Lima, Guilherme Theodoro Nascimento Pereira de, Silva-Filho, Emmanoel Vieira da
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da FURG (RI FURG)
• Texto Completo: http://repositorio.furg.br/handle/1/2029
• topic: Nutrients; Organic matter; Coastal lagoon; Sediments; Nutrientes; Matéria orgânica; Lagoa costeira; Sedimentos

Despite its ecological , economic s and geopolitical importanc e , Mirim lagoon is still poorly known .In this paper we present the first data about organic composition and nutrient levels in lagoon sediments . Total Organic Carbon N-total , and P-total had an average content of 1.26 %,0.163 % e 0.162% , respectively . The southern part of the lagoon is characterized by higher concentrations of these elements.This is due to the proximity of the main fluvialdischarges. Mirim lagoon sediments are poor in carbon and nitrogen , which is attributed to the organic in put dilution , high occurrence of sediment resuspension processes , and recent deposition of lagoon substratum .The N:Pratio is low in comparison to other aquatic environments .This is likely to be associated to the intense use of phosphate fertilizers and the high frequency of sediment resuspension .