Abstract
Percentages of nitrogen and phosphorus in 10 species of seaweeds (6 green and 4 red algae) were monitored from 1997 to 2004 by seasonal sampling in Guanabara Bay, South-eastern Brazil. The species did not show consistent variations in tissue N, P and N:P that related to annual cycles. Throughout this study, higher percentages of tissue N and P were found in Bostrychia radicans and Grateloupia doryphora (red algae) and lower in Cladophora rupestris and Codium decorticatum (green algae). In November 1999, the Icaraí Submarine Sewage Outfall became operational, resulting in a reduction of visual pollution in the area and an improvement in the local quality of seawater for recreational use. Measurements of dissolved nutrients at the sampling site did not indicate significant changes in concentrations after the commissioning of the submarine sewage outfall; however, tissue P and N:P ratio of most of species were significantly lower than in the first two years of this survey. Variations in tissue nitrogen throughout this study were not significant, except for G. doryphora in some comparisons. Results show that seaweeds function very well as monitors of environmental changes in Guanabara Bay. Experimental data are needed to identify possible environmental processes which are promoting changes in chemical composition of the local seaweed populations.
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Lourenço, S.O., Barbarino, E., Nascimento, A., Freitas, J.N.P., Diniz, G.S. (2006). Tissue nitrogen and phosphorus in seaweeds in a tropical eutrophic environment: What a long-term study tells us. In: Anderson, R., Brodie, J., Onsøyen, E., Critchley, A.T. (eds) Eighteenth International Seaweed Symposium. Developments in Applied Phycology, vol 1. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-5670-3_21
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DOI: https://doi.org/10.1007/978-1-4020-5670-3_21
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