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Inorganic carbon assimilation by planktonic community in Santos Basin, Southwestern Atlantic Ocean

Kutner, Deborah S.; Bowman, Jeff S.; Saldanha-Corrêa, Flávia M. P.; Chuqui, Mateus G.; Tura, Pedro M.; Moreira, Daniel L.; Brandini, Frederico P.; Signori, Camila N.

Ocean and Coastal Research; Vol. 71 No. Suppl. 3 (2023): Ocean and Coastal Research: Subsidies for ecosystem-based management in an offshore oil and gas exploration area, Santos Basin, Brazil (Special Article Collection)

Instituto Oceanográfico - Universidade de São Paulo 2024-04-10

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  • Título:
    Inorganic carbon assimilation by planktonic community in Santos Basin, Southwestern Atlantic Ocean
  • Autor: Kutner, Deborah S.; Bowman, Jeff S.; Saldanha-Corrêa, Flávia M. P.; Chuqui, Mateus G.; Tura, Pedro M.; Moreira, Daniel L.; Brandini, Frederico P.; Signori, Camila N.
  • Assuntos: Primary Production; Photoautotrophy; Chemoautotrophy; Carbon Cycle; Microbial Dynamics
  • É parte de: Ocean and Coastal Research; Vol. 71 No. Suppl. 3 (2023): Ocean and Coastal Research: Subsidies for ecosystem-based management in an offshore oil and gas exploration area, Santos Basin, Brazil (Special Article Collection)
  • Descrição: Primary production is essential in shaping biogeochemical cycles and microbial and ecosystem dynamics. Thedistribution of chemosynthetic rates in pelagic zones and their participation in the carbon cycle, especially whencompared to photosynthetic rates in the Southwestern Atlantic Ocean, are poorly constrained. This study aimedto measure pelagic photo- and chemosynthetic productivity and to analyze their spatial distribution and abioticdrivers. Samples for photosynthesis experiments collected at the surface and deep chlorophyll maximum (DCM)were incubated with 14C-bicarbonate at eight light levels, simulating in situ conditions. Samples for chemosynthesisexperiments were collected throughout the water column, from the surface, DCM, 250 m, 900 m, 1,200 m, and2,300 m, and were incubated in the dark. Rates were analyzed using statistical tests to verify spatial differencesbetween groups of samples and generalized linear models to identify correlations with environmental variables(temperature, salinity, density, mixed layer depth, dissolved oxygen, nitrite, nitrate, silicate, phosphate, turbidity,CDOM, and phycoerythrin and chlorophyll-a concentrations). Moreover, both processes were integrated from thesurface to the DCM and compared at the same stations to determine the relative contribution in the epipelagic zone.The photosynthetic and chemosynthetic rates were, on average, 3.00 ± 3.26 mg C m-3 h-1 and 0.97 ± 1.22 mg C m-3h-1, respectively. In most stations, chemosynthesis represented an average of 10.2% of total primary productivity,but surpassed photosynthesis in three experiments (reaching 63.4 – 78.8%). Photosynthesis displayed a clearoffshore-onshore gradient, along with correlated CDOM concentrations, indicating an autochthonous productionof the latter. Chemosynthesis, on the other hand, exhibited high variability and lack of prediction by studiedenvironmental variables, with isolated points of substantially higher activity.
  • DOI: 10.1590/
  • Títulos relacionados: https://www.revistas.usp.br/ocr/article/view/222924/203296
  • Editor: Instituto Oceanográfico - Universidade de São Paulo
  • Data de criação/publicação: 2024-04-10
  • Formato: Adobe PDF
  • Idioma: Inglês
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