Abstract
This long-term study, performed during the years 2003–2005 and 2008–2009, investigated the carbon (C), nitrogen (N), and phosphorus (P) contents of the phyto- and zooplankton communities and the nutrient regime of Cabo Frio Bay, SE Brazil. The information intends to serve as baseline of the plankton C, N, and P stoichiometry for the calibration of biogeochemical and ecological models in support to future findings related to the local and regional phenomena of climatic change. Cabo Frio Bay is a small semienclosed system set adjacent to a region subject to sporadic coastal upwelling. Zooplankton exhibited average annual C, N, and P contents of 11.6 ± 6.9 %, 2.8 ± 1.8 %, and 0.18 ± 0.08 %, and phytoplankton (>20 μm) 6.8 ± 6.0 %, 1.6 ± 1.5 %, and 0.09 ± 0.08 %, respectively. The C/N/P ratios correspond to the lowest already found to date for a marine environment. The low C contents must have been brought about by a predominance of gelatinous zooplankton, like Doliolids/ Salps and also Pteropods. Average annual nutrient concentrations in the water were 0.21 ± 0.1 μM for phosphate, 0.08 ± 0.1 μM for nitrite, 0.74 ± 1.6 μM for nitrate, and 1.27 ± 1.1 μM for ammonium. N/P ratios were around 8:1 during the first study period and 12:1 during the second. The plankton C/N/P and N/P nutrient ratios and elemental concentrations suggest that the system was oligotrophic and nitrogen limited. The sporadic intrusions of upwelling waters during the first study period had no marked effect upon the systems metabolism, likely due to dilution effects and the short residence times of water of the bay.
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Acknowledgments
This study was supported by the Geochemistry Network from PETROBRAS/Cenpes, the National Petroleum Agency (ANP), Brazil (grant 0050.004388.08.9) within the scope of the Upwelling Project (Projeto Ressurgência). We would like to thank the Instituto Nacional de Ciência e Tecnologia (INCTTMCOcean 573601/20089), CAPES (PDEE 455209-1) and the Instituto de Pesquisa da Marinha Almirante Paulo Moreira (IEAPM). Dsc. Eliane Gonzalez-Rodriguez and PhD Sergio de Oliveira Lourenço gave valuable support for the execution of this work. A. Albuquerque, B. Knoppers, and E. Silva-Filho are senior researchers of the National Council for Research and Development (CNPq, Brazil).
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Kütter, V.T., Wallner-Kersanach, M., Sella, S.M. et al. Carbon, nitrogen, and phosphorus stoichiometry of plankton and the nutrient regime in Cabo Frio Bay, SE Brazil. Environ Monit Assess 186, 559–573 (2014). https://doi.org/10.1007/s10661-013-3399-5
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DOI: https://doi.org/10.1007/s10661-013-3399-5