Sources and distributions of branched tetraether lipids and crenarchaeol along the Portuguese continental margin: Implications for the BIT index

Zell, Claudia; Kim, Jung-Hyun; Dorhout, Denise J C; Baas, Marianne; Damsté, Jaap S. Sinninghe

doi:10.1016/j.csr.2015.01.006

Cited by 39 publications

(25 citation statements)

References 60 publications

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“…Based on the BIT index (an indicator of continental organic carbon input, i.e. including both land-and river-derived organic carbon, also Zell et al (2015) found a strong signal of terrestrial organic matter at this coastal station. This suggests that the apparent marine value of δ 13 C TOC at 50 m water depth may be the result of mixed C 3 (− 28 to − 25‰) and C 4 (− 12‰) plant carbon yielding a δ 13 C TOC value that resembles that of marine plankton (Hedges et al, 1997).…”

Section: Tablementioning

confidence: 98%

“…Hedges et al, 1997). We are aware of such complications and thus use δ 13 C TOC as a bulk characterization of terrestrial organic matter in a zone where mixed terrestrial and marine organic matter are present, and where Zell et al (2015) on the basis of lipid biomarker analyses (e.g. BIT index) showed that terrestrial organic matter decreases seawards.…”

Section: Tablementioning

confidence: 99%

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Lateral and vertical distributions of living benthic foraminifera off the Douro River (western Iberian margin): Impact of the organic matter quality

Dessandier

Bonnin

Kim

et al. 2015

Marine Micropaleontology

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Section: Tablementioning

confidence: 98%

Section: Tablementioning

confidence: 99%

Lateral and vertical distributions of living benthic foraminifera off the Douro River (western Iberian margin): Impact of the organic matter quality

Dessandier

Bonnin

Kim

et al. 2015

Marine Micropaleontology

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“…For this, the living benthic foraminifera and environmental parameters from the western Iberian margin, a well‐studied area in terms of sedimentology and OM sources [ Jouanneau et al ., ; Dias et al ., ; García et al ., ; Martins et al ., ; Zell et al ., ] has been investigated. This study area is also well characterized in terms of anthropogenic contamination of trace metals and δ 15 N variations due to agriculture and industrialization of the Iberian Peninsula [ Alt‐Epping et al ., ; Martins et al ., ], in the Douro estuary [ Mucha et al ., , , ] or the Tagus and Sado estuaries [ Caçador et al ., ; Jouanneau et al ., ].…”

Section: Introductionmentioning

confidence: 99%

Impact of organic matter source and quality on living benthic foraminiferal distribution on a river‐dominated continental margin: A study of the Portuguese margin

et al. 2016

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Living (rose Bengal stained) benthic foraminifera were investigated on surface sediments from 23 stations from the river-dominated northwestern Portuguese margin. Samples were collected in March 2011, following the period of the maximum rainfall over the Iberian Peninsula, between 20 and 2000 m water depth along five cross-margin transects. Four of them are located off the Douro, Mondego, Tagus, and Sado Rivers and one off the Estremadura coast. The major objectives of this study are (1) to assess the impact of organic matter of various origin and quality on the benthic foraminifera and (2) to investigate the spatial differences of faunal distribution from coastal waters to the deep sea under river influences. To do this, sedimentological and biogeochemical characteristics of the sediments were identified by measuring grain size, oxygen penetration depth, total organic carbon (TOC) content, stable carbon isotopic composition of TOC (δ 13 C TOC ) and concentration of pigments and amino acids. Based on the principal component and cluster analyses of the environmental data, three major geographical groups are identified: (1) deep stations, (2) coastal and middle slope stations, and (3) shelf stations under river influence. At the deepest stations, species are associated with high organic matter (OM) quantity but low OM quality, where Uvigerina mediterranea, Hoeglundina elegans, and agglutinated species such as Reophax scorpiurus or Bigenerina nodosaria are dominant. All stations off the Sado River, which is the most affected area by the anthropogenic influence, are also characterized by high quantity but low quality of OM with the minimum faunal density and diversity within the study area. Middle slope stations are associated with low OM content and coarse sediments (Q 50 ) with the predominance of N. scaphum. Shallow shelf stations close to the Douro and Tagus River mouths show a dominance of taxa (e.g., Ammonia beccarii, Bulimina aculeata, Eggerelloides scaber, Nonion scaphum, Cancris auriculus, and Quinqueloculina seminula) adapted to environments characterized by high OM quality (high fresh chlorophyll (Chl a/Phaeo)) and available amino acids (enzymatically hydrolyzable amino acid (EHAA)/total enzymatically hydrolyzable amino acid (THAA)). The Biotic and Environmental linking analysis suggests that the benthic foraminiferal distribution is mostly controlled by three environmental parameters, i.e., TOC (quantity), EHAA/THAA (quality), and δ 13 C TOC (source). Hence, this study clearly highlights that the quantitative and qualitative inputs of OM and its source are the most important factors controlling the living benthic foraminiferal distribution with clear influences between the different rivers. This study also suggests a good tolerance of several species for river discharges where the OM quality is high.

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“…In the Amazon basin, many studies have characterized the suspended particulate organic matter (SPOM) in the rivers and the floodplain lakes and concluded that the main sources of OM to the aquatic system are the forests and the upstream Andean soils (e.g., Hedges et al, 1986Hedges et al, , 1994Quay et al, 1992;Victoria et al, 1992;Moreira-Turcq et al, 2004Aufdenkampe et al, 2007;Mortillaro et al, 2011;Zell et al, 2013b). However, little is known about the molecular composition of the SOM in the floodplain lakes in general, and in particular, the contribution of the multiple sources of OM (upland soils, flooded and non-flooded forests, aquatic macrophytes, and phytoplankton) remains uncertain (Mortillaro et al, 2011;Zocatelli et al, 2011;Moreira et al, 2014).…”

Section: R L Sobrinho Et Al: Spatial and Seasonal Contrasts Of Sedmentioning

confidence: 99%

Spatial and seasonal contrasts of sedimentary organic matter in floodplain lakes of the central Amazon basin

et al. 2016

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Abstract. In this study, we investigated the seasonal and spatial pattern of sedimentary organic matter (SOM) in five floodplain lakes of the central Amazon basin (Cabaliana, Janauaca, Canaçari, Mirituba and Curuai) which have different morphologies, hydrodynamics and vegetation coverages. Surface sediments were collected in four hydrological seasons: low water (LW), rising water (RW), high water (HW) and falling water (FW) in 2009 and 2010. We investigated commonly used bulk geochemical tracers such as the C : N ratio and the stable isotopic composition of organic carbon (δ 13 C org ). These results were compared with lignin phenol parameters as an indicator of vascular plant detritus and branched glycerol dialkyl glycerol tetraethers (brGDGTs) to trace the input of soil organic matter (OM) from land to the aquatic settings. We also applied the crenarchaeol as an indicator of aquatic (rivers and lakes) OM. Our data showed that during the RW and FW seasons, the surface sediments were enriched in lignin and brGDGTs in comparison to other seasons. Our study also indicated that floodplain lake sediments primarily consisted of allochthonous, C 3 plant-derived OM. However, a downstream increase in C 4 macrophyte-derived OM contribution was observed along the gradient of increasing open waters -i.e., from upstream to downstream. Accordingly, we attribute the temporal and spatial difference in SOM composition to the hydrological dynamics between the floodplain lakes and the surrounding flooded forests.

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Sources and distributions of branched tetraether lipids and crenarchaeol along the Portuguese continental margin: Implications for the BIT index

Cited by 39 publications

References 60 publications

Lateral and vertical distributions of living benthic foraminifera off the Douro River (western Iberian margin): Impact of the organic matter quality

Lateral and vertical distributions of living benthic foraminifera off the Douro River (western Iberian margin): Impact of the organic matter quality

Impact of organic matter source and quality on living benthic foraminiferal distribution on a river‐dominated continental margin: A study of the Portuguese margin

Spatial and seasonal contrasts of sedimentary organic matter in floodplain lakes of the central Amazon basin

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