Chemical characterization of deep-sea corals from the continental slope of Santos Basin (southeastern Brazilian upper margin)

Trevizani, Tailisi Hoppe; Nagai, Renata Hanae; Figueira, Rubens César Lopes; Sumida, Paulo Yukio Gomes; Mahiques, Michel Michaelovitch de

doi:10.1590/2675-2824070.21108tht

Cited by 4 publications

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“…The presence of methanotrophy and hydrocarbon degradation in the SWACP could explain the low detection of organic compounds. Local corals represent an additional source of nutrients for the SWACP sediment (Trevizani et al, 2022). However, the nutrients in inactive pockmarks tend to be less abundant than in surrounding sediments, as reported by Haverkamp et al (2014), in which TOC and TC concentrations differ from reference sediments.…”

Section: Geochemistry Of the Inactive Pockmark Sedimentmentioning

confidence: 82%

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Methane-related community of a carbonate-enriched pockmark, Brazilian Southeastern continental slope

et al. 2022

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Ocean and Coastal ResearchPockmarks are geological features that often sustain hydrocarbon-related communities of microorganisms when active, seeping oil or methane. Microbial communities of inactive pockmarks have not been well studied until the present. Plenty of pockmarks in the Southwestern Atlantic Ocean have been discovered. However, no information is available about the organic characteristics in association with the microbial diversity related to methane and nonmethane hydrocarbon consumption. This study examined the identity and potential ecology of the methane-related microbial community in an inactive SW Atlantic Carbonate-enriched Pockmark (SWACP). Undisturbed sediment cores were enriched with CH 4 99.5% at 5°C, with samples harvested at 16h, 120h, 240h, 720h, and 960h, followed by metataxonomics functional prediction, and the correlation of microbial groups with incubation and enrichment types. The SWACP is depleted in organic compounds, and chemosynthetic production is dominant. Incubated mini-cores of sediment were affected by incubation time and enrichment type, which influenced the microbial composition. Although several taxa were shared among all sediment samples, specific groups per enrichment type and incubation time were observed. These communities comprised taxa previously reported in marine bottom waters, carbonate crusts, active cold-seeps, and inactive pockmarks. The methane-enriched taxa were predominantly related to aerobic methanotrophy, methylotrophy, aerobic and anaerobic non-methane hydrocarbon degradation, and fermentation. This study brings the first survey of the key microbial groups in methane fluxes of a Brazilian deep-sea pockmark, providing data for understanding the ecology surrounding the SW Atlantic gas field areas.

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Section: Geochemistry Of the Inactive Pockmark Sedimentmentioning

confidence: 82%

“…Deepsea corals of species Enallopsammia rostrata, Solenosmilia variabilis, and Desmophyllum pertusum are also present in the box-core sample. Metals ratios of the corals indicate nutrient enrichment in the region (Trevizani et al, 2022). The sediment is homogeneous gray until 20 centimeters below the seafloor (Figure SF1).…”

Section: Sediment Samplingmentioning

confidence: 99%

Methane-related community of a carbonate-enriched pockmark, Brazilian Southeastern continental slope

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“…Three areas of interest (A1, A2, and A3) were previously delimited for sampling (Figure 1). Area 1 (stations 681, 683 and 684, Figure 1C) consists of a carbonate seabed and an environment with a high concentration of nutrients (Trevizani et al, 2022). Area 2 (stations 685, 687 and 688, Figure 1D) contains a ring-shaped carbonate mound province known as Alpha Crucis Carbonate Ridge (ACCR) formed by carbonate walls and ridges that elevates over 300 m over the seafloor (Maly et al, 2019).…”

Section: Study Areamentioning

confidence: 99%

Macrobenthic assemblages across deep-sea pockmarks and carbonate mounds at Santos Basin, SW Atlantic

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Ocean and Coastal ResearchThe SE Brazilian continental margin is rich in geomorphological features that create different seascapes, where diverse benthic communities thrive. The seafloor is composed of a mixture of pockmarks of different sizes and shapes and tall carbonate mounds that may form extensive chains. Mounds are colonized by deep-water corals which are the main responsible organisms promoting growth over geological time. Depressions and mounds affect the benthic ecosystem in multiple ways owing to water flow, sedimentation rates and food availability. This paper presents new data on macrofaunal composition and community structure associated with deep-sea coral habitats and pockmark areas along the upper continental slope of Santos Basin. Ten sites were sampled using a 0.25 m2 box corer on board R/V Alpha-Crucis, totaling 27 sediment samples. A total of 182 taxa were found, including new records for the Southwestern Atlantic, as well as several potential new species to science. In general, we observed an association of the macrobenthic fauna with the geomorphology of the area and the most important variables, mainly substrate composition and water flux. The abundance, taxonomic composition and also the feeding modes varied across the deep-water coral sites and pockmarks, reflecting in a mosaic of benthic habitats. As deepsea corals and pockmarks are extremely sensitive to anthropogenic influence and natural shifts, in addition to the economic value associated to fisheries, this study provides baseline information on these special habitats in Santos Basin that can be used for future research, monitoring activities, and conservation strategies.

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“…The area is adjacent to the large carbonate mound province The Alpha Crucis Carbonate Ridge (AACR) (Maly et al, 2019) and presents a seafloor with carbonate composition. A study in the area shows that the region has a high concentration of nutrients through the metal ratios of the corals that compose the bottom (Trevizani et al, 2022). This study is part of a multidisciplinary project called "BIOIL" financed by Shell Brazil.…”

Section: Study Area and Sampling Strategymentioning

confidence: 99%

First description of archaeal communities in carbonate-rich seafloor and subseafloor sediments from the Southwestern Atlantic slope

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Deep-sea sediments comprise one of the largest habitats on Earth. The archaeal groups contribute to a large fraction of the deep-sea benthic biomass, playing a key role in biogeochemical cycles. However, their diversity in deep-sea benthic ecosystems remains poorly understood, mostly because only recently novel taxa have been proposed, thus remodeling the phylogenetic tree. Despite the diffculty in obtaining cultivated representatives, the metabolic capabilities of archaea have lately been described through metagenomic data, indicating that archaeal taxa are highly versatile. Here, we aimed to reveal the diversity of archaeal communities in surface (0 to 15 cm depth) and subsurface (200 cm depth) sediments from a carbonate-rich region in the Southwestern Atlantic upper slope. We performed 16S rRNA gene sequencing, and found that the archaeal composition in surface sediments was mainly dominated by ammonia-oxidizing archaea within Nitrososphaeria class. The distribution of Nitrososphaeria ASVs (amplicon sequence variants) indicates the presence of several species or ecotypes. Contrastingly, the subsurface sediment was dominated by uncultivated anaerobic and poorly known archaea, including representatives of all supergroups (Asgard, TACK, DPANN and Euryarchaeota). These archaea have been described as having potentially diverse metabolic capabilities, including autotrophic and heterotrophic pathways, such as acetogenesis, methylotrophy, and degradation of labile and recalcitrant organic compounds. This indicates an important role in the remineralization of organic matter in the SW (Southwest) Atlantic slope. They are likely enriched due to the transport and mixing of sediments by the IWBC (Intermediate Western Boundary Current) along the continental slope. However, further studies are needed to reveal the geochemical and oceanographic drivers of the archaeal distribution. This study provides the first description of the archaeal communities in carbonate-rich sediments in the SW Atlantic slope, and adds new biodiversity insights to this geological feature, which is considered a vulnerable marine ecosystem, thus helping for future conservation strategies.

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Chemical characterization of deep-sea corals from the continental slope of Santos Basin (southeastern Brazilian upper margin)

Cited by 4 publications

References 59 publications

Methane-related community of a carbonate-enriched pockmark, Brazilian Southeastern continental slope

Methane-related community of a carbonate-enriched pockmark, Brazilian Southeastern continental slope

Macrobenthic assemblages across deep-sea pockmarks and carbonate mounds at Santos Basin, SW Atlantic

First description of archaeal communities in carbonate-rich seafloor and subseafloor sediments from the Southwestern Atlantic slope

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