Fatty acid biomarkers of organic matter sources and early diagenetic signatures in sediments from a coastal upwelling area (south-eastern Brazil)

Venturini, Natalia; Salhi, M.; Bessonart, Martín; Pires-Vanin, Ana Maria Setúbal

doi:10.1080/02757540.2011.644537

Cited by 13 publications

(6 citation statements)

References 49 publications

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“…Lower ratios indicate relatively fresher OM derived from marine sources, such as plankton (C:N 4-7), whereas higher ratios reflect OM that has preferentially lost N during remineralization and/or N-deficient and refractory terrestrial material (>20) (Mahiques et al 1998). The values for C:N of between 9 and 12 found in this study usually reflect partially degraded material composed by marine phytoplankton and zooplankton faecal pellets with relatively little terrestrial OM (Venturini et al 2011). The larger contribution of SCFA (36-46%) compared with LCFA (6-11%) indicates a predominance of marine sources over terrestrial material (Yoshinaga et al 2008 and references therein).…”

Section: Quantity and Sources Of Om In The Sedimentmentioning

confidence: 55%

“…The values for C:N of between 9 and 12 found in this study usually reflect partially degraded material composed by marine phytoplankton and zooplankton faecal pellets with relatively little terrestrial OM (Venturini et al . ). The larger contribution of SCFA (36–46%) compared with LCFA (6–11%) indicates a predominance of marine sources over terrestrial material (Yoshinaga et al .…”

Section: Discussionmentioning

confidence: 97%

“…; Venturini et al . ). To fully understand the relation between labile OM and microbial responses requires a simultaneous analysis of water column chemistry and a detailed characterization of OM composition in sediments.…”

Section: Introductionmentioning

confidence: 97%

“…In shallower waters of the S-SE Brazilian coast, the amount of labile OM can vary temporally or as a consequence of the seabed exposure to waves and storms (i.e. sediment resuspension), which has a strong effect on controlling the structure of benthic meio-macrofaunal communities (Gallucci & Netto 2004;Quintana et al 2010;Venturini et al 2011). To fully understand the relation between labile OM and microbial responses requires a simultaneous analysis of water column chemistry and a detailed characterization of OM composition in sediments.…”

Section: Introductionmentioning

confidence: 99%

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Microbial biomass response to different quantities and sources of organic matter in Brazilian coastal sediments

et al. 2014

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This study investigates the benthic microbial responses to organic matter (OM) variations in quantity and sources in two shallow water bays (Fortaleza and Ubatuba Bays) on the SE coast of Brazil on six occasions during the year. The pelagic and benthic compartments of the bays were evaluated by: (i) nutrients and chlorophyll a (Chl a) in the water column; (ii) quantity and sources of OM in the sediment (Chl a, total organic carbon and total nitrogen and lipid biomarker composition); and (iii) microbial biomass in sediments as an indicator of active benthic response. Although there were changes in water‐column nutrients during the year, Chl a was fairly constant, suggesting a regular supply of microalgae‐derived OM to the sea bottom. Based on the composition of lipid biomarkers in sediments, OM sources were classified as mostly marine and with high contributions of labile (microalgae‐derived) OM. Labile OM composition varied from diatoms in the summer to phytoflagellates in the winter and tended to accumulate in areas protected by physical disturbances in one of the bays. Microbial biomass followed this trend and was 160% higher in protected than in exposed areas. This study suggests that the coupling between labile OM and benthic microbial biomass occurs primarily in protected areas, irrespective of the time of the year. Since meio‐ and macrofaunal assemblages depend upon secondary microbial production within the sediments, this coupling may have an important role for the benthic food‐web.

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Section: Quantity and Sources Of Om In The Sedimentmentioning

confidence: 55%

Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Microbial biomass response to different quantities and sources of organic matter in Brazilian coastal sediments

et al. 2014

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“…For detailed studies about structure of benthic communities in the SSC see Muniz and Pires (1999;2000), Pires-Vanin (2008); for functional ecology data see Arasaki et al (2004) and Pires-Vanin et al (2013) and for ecosystem functioning Venturini et al (2011;2012).…”

Section: Resultsmentioning

confidence: 99%

Inventory of the marine soft bottom macrofauna of São Sebastião Channel, southeastern Brazilian continental shelf

Pires-Vanin¹,

Muñiz²,

Bromberg³

2014

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Habitat characteristics mediated partitioning of economically important bivalves in a tropical monsoon–influenced estuary

Desai

Gardade

Khandeparker

et al. 2020

Environ Sci Pollut Res

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Fatty acid biomarkers of organic matter sources and early diagenetic signatures in sediments from a coastal upwelling area (south-eastern Brazil)

Cited by 13 publications

References 49 publications

Microbial biomass response to different quantities and sources of organic matter in Brazilian coastal sediments

Microbial biomass response to different quantities and sources of organic matter in Brazilian coastal sediments

Inventory of the marine soft bottom macrofauna of São Sebastião Channel, southeastern Brazilian continental shelf

Habitat characteristics mediated partitioning of economically important bivalves in a tropical monsoon–influenced estuary

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