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Impact of a low salinity year on the metabolism of a hypersaline coastal lagoon (Brazil)

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Abstract

Araruama Lagoon is a large, continuously hypersaline coastal lagoon (mean salinity 52 g l-1). However, during certain years the evaporation-precipitation balance is modified and results in lower salinity conditions, e.g. 1989–1990 when the mean salinity measured 41 g l-1. These atypical conditions are responsible for a different behavior of the system, normally characterized by the presence of extensive microbial algal mats, low pelagic primary production compared to benthic primary production, and low turbidity. However, during this study (1989–1990), the presence of microbial algal mats was restricted to the shallow eastern embayment of the lagoon representing c.a. 8% of the total area, the mean concentration of suspended matter was relatively high (21.2 mg l-1) when compared with a typical year, and primary production measured was 447 mg C m-2 d-1, higher than benthic primary production during hypersaline years. These conditions therefore influence the trophic state of the system, during low salinity conditions, the lagoon was meso-eutrophic.

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  1. Patricia F. Moreira-Turcq

    Present address: Institut de Recherche pour le Développement-IRD, 32, avenue Henri Varagnat, 93143, Bondy cedex, France

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  1. Departamento de Geoquímica-CNPq, Universidade Federal Fluminense, Morro do Vanguinho s/n, 5° andar, 24020-007, Niterói, RJ, Brazil

    Patricia F. Moreira-Turcq

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Moreira-Turcq, P.F. Impact of a low salinity year on the metabolism of a hypersaline coastal lagoon (Brazil). Hydrobiologia 429, 133–140 (2000). https://doi.org/10.1023/A:1004037624787

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