Microbial ecology of the South Atlantic Subtropical Gyre: a state-of-the-art review of an understudied ocean region

Frazão, Luciana Rocha; Penninck, Silvana B.; Mychelazzo, Luan Sayeg; Vega, Gelaysi Moreno; Guimarães, Claudia Maria Duarte de Sá; Lopes, Rubens M.; Signori, Camila Negrão

doi:10.1590/2675-2824069.20026lrf

Cited by 5 publications

(2 citation statements)

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“…The deep sea, defined as the ocean lying below 200 m depth, is a highly connected environment; however, it remains undersampled, particularly in the southern hemisphere (Levin et al, 2019;Frazão et al, 2021). A recent review on microbial ecology in the ocean reported that there are only 38 studies in the ocean basins of the southern hemisphere, compared with 290 studies conducted in the North Atlantic Ocean (Frazão et al, 2021).…”

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confidence: 99%

Contribution of chemoautotrophy and heterotrophy to the microbial carbon cycle in the Southwestern Atlantic Ocean

et al. 2022

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Dark carbon fixation (DCF) is a source of new and labile carbon in the deep ocean, while heterotrophic microbial production (HMP) promotes organic matter transfer through the microbial loop. Despite their ecological relevance, there is a scientific gap regarding the estimates of DCF and HMP in the Southwestern Atlantic Ocean. Thus, the aim of this study was to investigate the spatial distribution of DCF and HMP; their relevance to the ocean carbon cycle; their relationship with environmental parameters and amongst themselves on the upper slope of Santos Basin. The samples were collected at three different water depths and sediment layers aboard the R/V Alpha Crucis in November 2019. DCF and HMP rates were measured by 14 C-bicarbonate and 3 H-leucine incorporation, respectively, and incubated in the dark. In the water column, DCF rates varied from 1.51 x 10 1 to 3.24 x 10 2 µg C m -3 h -1 , which were one to two orders of magnitude lower than the HMP rates, from 1.26 x 10 2 to 1.48 x 10 4 µg C m -3 h -1 . In the sediments, the DCF ranged from 1.15 x 10 4 to 1.83 x 10 5 µg C m -3 h -1 , while HMP was one to four orders of magnitude lower, 3.22 x 10 1 to 1.56 x 10 3 µ gC m -3 h -1 . DCF rates were significantly higher in the sediments, due to a higher availability of energy sources than in the oligotrophic water above. The HMP had higher rates in the water column as it is deeply dependent on organic matter derived from photosynthesis. This is the first study to investigate DCF and HMP considering the water column and sediments of the Southwestern Atlantic Ocean, thus contributing to a better understanding of the microbial role in the marine carbon cycle and ecosystem functioning.

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Section: Introductionmentioning

confidence: 99%

Contribution of chemoautotrophy and heterotrophy to the microbial carbon cycle in the Southwestern Atlantic Ocean

et al. 2022

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“…Many works have addressed how physical and chemical factors can drive plankton distribution patterns (BASTERRETXEA; FONT-MUÑOZ;TUVAL, 2020;VILLAMAÑA et al, 2019) and described the structure of microbial communities in certain regions of the Atlantic Ocean (FERREIRA et al, 2022;PÉREZ et al, 2005;TARRAN;HEYWOOD;ZUBKOV, 2006). However, the vertical and spatial distribution of pico-nanoplankton in coastal areas in the Southwestern Atlantic Ocean and its interaction with submesoscale processes have been relatively poorly studied (BERGO et al, 2017;FRAZÃO et al, 2021;RIBEIRO et al, 2016).…”

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confidence: 99%

Influence of environmental drivers on the plankton distribution on the inner shelf off Ubatuba, southeastern Brazil

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Temporal patterns of picoplankton abundance and metabolism on the western coast of the equatorial Atlantic Ocean

et al. 2023

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Microbial ecology of the South Atlantic Subtropical Gyre: a state-of-the-art review of an understudied ocean region

Cited by 5 publications

References 115 publications

Contribution of chemoautotrophy and heterotrophy to the microbial carbon cycle in the Southwestern Atlantic Ocean

Contribution of chemoautotrophy and heterotrophy to the microbial carbon cycle in the Southwestern Atlantic Ocean

Influence of environmental drivers on the plankton distribution on the inner shelf off Ubatuba, southeastern Brazil

Temporal patterns of picoplankton abundance and metabolism on the western coast of the equatorial Atlantic Ocean

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