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Marine Ecology Progress Series

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MEPS 573:61-72 (2017)  -  DOI:

Influence of mixed upwelled waters on metabolic balance in a subtropical coastal ecosystem: São Sebastião Channel, southern Brazil

Aurore Regaudie-de-Gioux1,4,*, Alexandre Castagna1, Amabile Ferreira1, Medea Abbrecht2, Elisabete S. Braga3, Aurea M. Ciotti1

1Laboratório Aquarela, Centro de Biologia Marinha (CEBIMar), Universidade de São Paulo, Rod. Manoel Hipólito do Rego Km 131.5, São Sebastião-SP, 11600-000, Brazil
2Universität Hohenheim, Schloss Hohenheim 1, 70599 Stuttgart, Germany
3Laboratório de Biogeoquímica de Nutrientes, Micronutrientes e Traços nos Oceanos, Instituto Oceanográfico, Universidade de São Paulo, Praça do Oceanográfico, 191, São Paulo-SP, 05508-900, Brazil
4Present address: Instituto Mediterranéo de Estudios Avanzados, calle Miquel Marqués 21, 07190 Esporles, Spain
*Corresponding author:

ABSTRACT: Planktonic gross primary production (GPP), community respiration (CR) and net community production (NCP) were evaluated for the first time in the central part of the Southern Brazilian Bight (SBB), in the São Sebastião Channel (SSC); and their response to the South Atlantic Coastal Water (SACW) intrusion was investigated. Sampling experiments took place during late spring 2015 and summer 2016 at a fixed station in the southern portion of the SSC. Although both chlorophyll a and nutrient concentrations were characteristic of oligotrophic and low productive ecosystems, all volumetric planktonic metabolism experiments showed high net and gross primary productions rates. Depth-integrated NCP and GPP values had a global mean ±SE of 31 ± 10.5 and 106.7 ± 11.5 mmol O2 m-2 d-1, respectively. The communities tended to be net heterotrophic (i.e. GPP/CR < 1) at volumetric GPP values less than 7.10 mmol O2 m-3 d-1. The intrusion of nutrient-rich and -mixed water (partly SACW) observed during the summer experiments had a strong influence on autotrophic planktonic communities, enhancing their NCP rates about 3-fold. Nutrient supply by terrestrial inputs and by upwelled SACW intrusion in the SSC enables high primary production to be sustained with a dominance of autotrophic communities.

KEY WORDS: Plankton · Metabolism · Southern Brazilian Bight · SACW

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Cite this article as: Regaudie-de-Gioux A, Castagna A, Ferreira A, Abbrecht M, Braga ES, Ciotti AM (2017) Influence of mixed upwelled waters on metabolic balance in a subtropical coastal ecosystem: São Sebastião Channel, southern Brazil. Mar Ecol Prog Ser 573:61-72.

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