Benthic foraminifera distribution in a deltaic clinoform (São Francisco Delta, eastern Brazil): A reference study

Araújo, Helisângela Acris Borges de; Domínguez, José Maria Landim; Machado, Altair de Jesus; Rangel, Adriane Gonçalves de Araújo Nunes

doi:10.1016/j.jmarsys.2018.05.004

Cited by 18 publications

(3 citation statements)

References 43 publications

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“…Bolivina robusta may be able to tolerate high eutrophication and is a useful indicator of low oxygen condition at the seafloor (B. Zhao et al., 2018). Globocassidulina subglobosa , which prefers oxic conditions and high to the intermediate food supply, is a cosmopolitan epifaunal species (Araújo et al., 2018; Das et al., 2021; Kaminski, 2012; Martins et al., 2007; Murray, 2006; R. K. Singh et al., 2021; Verma et al., 2013). Biofacies Ct indicates an enhanced phytodetritus flux into the ECS associated with suboxic conditions that occasionally become dysoxic, as shown by the presence of B. robusta .…”

Section: Resultsmentioning

confidence: 99%

“…It has also been reported as a suboxic and shallow infaunal to epi- Oxic Species Epifaunal Cibicidoides mundulus (Kaiho, 1994;Pérez-Asensio et al, 2017) Epifaunal Cibicidoides wuellerstorfi (Das et al, 2017;De & Gupta, 2010;Kaiho, 1994) Epifaunal Epistominella exigua (Bhaumik et al, 2007;De & Gupta, 2010) Epifaunal Gavelinopsis sp. (Akimoto & Hasegawa, 1989;Takata et al, 2018) Epifaunal Globocassidulina subglobosa (Araújo et al, 2018;Kaiho, 1994;Kaminski, 2012;Singh et al, 2021;Verma et al, 2013) Epifaunal Quinqueloculina seminulum (Das et al, 2017;Hayward et al, 1997;Kaminski, 2012;Laprida et al, 2007) Epifaunal Sigmoilopsis schlumbergeri (Kaminski, 2012;Mackensen et al, 1995;Saravanan et al, 2019) Suboxic Species…”

Section: Biofacies Gvmentioning

confidence: 99%

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Linkages Between East China Sea Deep‐Sea Oxygenation and Variability in the East Asian Summer Monsoon and Kuroshio Current Over the Last 400,000 years

Vats

Singh

Das

et al. 2021

Paleoceanog and Paleoclimatol

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The East China Sea (ECS) seasonally receives a high organic input due to the terrestrial organic matter influx, which is controlled by the East Asian Summer Monsoon (EASM), and the increased productivity driven by upwelling of the subsurface Kuroshio Current (KC). Changes in benthic foraminiferal assemblage composition in combination with paleoceanographic proxy data (CaCO3 (%), TOC (%), δ13Cpf, and δ18Obf) are used to reconstruct bottom water oxygenation and organic export flux variability over the last 400 kyr in the ECS. Multivariate analyses of benthic foraminiferal census data identified six biofacies characteristic of varying environmental conditions. These results suggest that enhanced EASM precipitation and KC upwelling directly influenced organic export flux and bottom water oxygen content in the ECS. The ECS bottom water was suboxic during Marine Isotope Stage (MIS) 11 to 8; suboxic to dysoxic between MIS 7 and 6, strongly dysoxic between mid‐MIS 5 and 4, and exhibited high variability between MIS 3 and 1. Spectral analysis of relative abundances of representative genera Quinqueloculina (oxic), Bulimina (suboxic), and Globobulimina (dysoxic) reveals a robust 23 kyr signal, which we attribute to precessionally‐paced changes in surface productivity and bottom water oxygenation related to KC variability over the past 400 kyr.

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Section: Resultsmentioning

confidence: 99%

Section: Biofacies Gvmentioning

confidence: 99%

Linkages Between East China Sea Deep‐Sea Oxygenation and Variability in the East Asian Summer Monsoon and Kuroshio Current Over the Last 400,000 years

Vats

Singh

Das

et al. 2021

Paleoceanog and Paleoclimatol

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show abstract

“…To better understand the environment characteristics we decided to classify the horizontal distribution studies as associated with benthic organisms that have habitats and depend on the seafloor substrate to live. Benthic organisms are influenced by physical parameters such as temperature, salinity, and currents (de Araújo et al, 2018;Bremec and Schejter, 2019;Teso et al, 2019). However, chemical processes are mainly responsible for maintenance and variability of biological assemblages' distribution in submarine canyons where the nutrient exchanges are bigger than abyssal regions (Yamashita et al, 2018).…”

Section: Knowledge Of Biological Communitiesmentioning

confidence: 99%

The South American Advances in Submarine Canyons Studies and Their Link to the Ocean Decade

Silva¹,

Araújo²

2021

Front. Mar. Sci.

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Submarine canyons have a relevant role in marine ecosystems. They are responsible for oceanographic conditions such as variability of temperature and salinity, sediment transport, nutrients, and even pollutants amongst marine areas. Submarine canyon studies have been growing and reaching prominence due to their importance in the Blue Economy. Initiatives to promote sustainable development for the ocean have been discussed in the Ocean Decade. Although canyons studies are increasing, how can we integrate these with the Ocean Decade outcomes? Thus, we aim to demonstrate an overview of the advances of submarine canyons studies and their link to the Ocean Decade for South America. We analyzed 160 studies divided into spatiotemporal analysis and study approaches according to the Ocean Decade outcomes. We discuss these articles, building a timeline and argumentative topics considering the advances, and discuss gaps to predict the future of submarine canyons studies in the Ocean Decade and Blue Economy context.

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Linkages between East China Sea Deep-sea Oxygenation and the Variability of the East Asian Summer Monsoon and Kuroshio Current over last 400,000 years

Vats

Singh

Das

et al. 2021

Preprint

View full text Add to dashboard Cite

The East China Sea (ECS) seasonally receives a high organic input due to the terrestrial organic matter influx, which is controlled by the East Asian Summer Monsoon (EASM), and the increased productivity driven by upwelling of the subsurface Kuroshio Current (KC). Changes in benthic foraminiferal assemblage composition in combination with paleoceanographic proxy data (CaCO3 (%), TOC (%), δ 13 Cpf, and δ 18 Obf) are used to reconstruct bottom water oxygenation and organic export flux variability over the last 400 kyr in the ECS. Multivariate analyses of benthic foraminiferal census data identified six biofacies characteristic of varying environmental conditions. These results suggest that enhanced EASM precipitation and KC upwelling directly influenced organic export flux and bottom water oxygen content in the ECS. The ECS bottom water was suboxic during Marine Isotope Stage (MIS) 11 to 8; suboxic to dysoxic between MIS 7 and 6, strongly dysoxic between mid-MIS 5 and 4, and exhibited high variability between MIS 3 and 1. Spectral analysis of relative abundances of representative genera Quinqueloculina (oxic), Bulimina (suboxic), and Globobulimina (dysoxic) reveals a robust 23 kyr signal, which we attribute to precessionally-paced changes in surface productivity and bottom water oxygenation related to KC variability over the past 400 kyr.

show abstract

Benthic foraminifera distribution in a deltaic clinoform (São Francisco Delta, eastern Brazil): A reference study

Cited by 18 publications

References 43 publications

Linkages Between East China Sea Deep‐Sea Oxygenation and Variability in the East Asian Summer Monsoon and Kuroshio Current Over the Last 400,000 years

Linkages Between East China Sea Deep‐Sea Oxygenation and Variability in the East Asian Summer Monsoon and Kuroshio Current Over the Last 400,000 years

The South American Advances in Submarine Canyons Studies and Their Link to the Ocean Decade

Linkages between East China Sea Deep-sea Oxygenation and the Variability of the East Asian Summer Monsoon and Kuroshio Current over last 400,000 years

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