Spatial heterogeneity of sources of branched tetraethers in shelf systems: The geochemistry of tetraethers in the Berau River delta (Kalimantan, Indonesia)
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 wate...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/347537 2023-11-12T04:20:03+01:00 Spatial heterogeneity of sources of branched tetraethers in shelf systems: The geochemistry of tetraethers in the Berau River delta (Kalimantan, Indonesia) Sinninghe Damsté, J.S. Organic geochemistry Organic geochemistry & molecular biogeology 2016-08 image/pdf https://dspace.library.uu.nl/handle/1874/347537 en eng 0016-7037 https://dspace.library.uu.nl/handle/1874/347537 info:eu-repo/semantics/OpenAccess GDGT Tetraether Branched GDGT Isoprenoid GDGT BIT index Temperature reconstruction Shelf sea Estuary Soil Riverine organic matter Terrestrial organic matter Surface sediments Berau River Svalbard fjord South China Sea Portuguese margin Kara Sea Article 2016 ftunivutrecht 2023-11-01T23:13:49Z 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 (δ13CTOC) 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 (Q50) 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 ... Article in Journal/Newspaper Kara Sea Svalbard Utrecht University Repository Kara Sea Svalbard |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
GDGT Tetraether Branched GDGT Isoprenoid GDGT BIT index Temperature reconstruction Shelf sea Estuary Soil Riverine organic matter Terrestrial organic matter Surface sediments Berau River Svalbard fjord South China Sea Portuguese margin Kara Sea |
spellingShingle |
GDGT Tetraether Branched GDGT Isoprenoid GDGT BIT index Temperature reconstruction Shelf sea Estuary Soil Riverine organic matter Terrestrial organic matter Surface sediments Berau River Svalbard fjord South China Sea Portuguese margin Kara Sea Sinninghe Damsté, J.S. Spatial heterogeneity of sources of branched tetraethers in shelf systems: The geochemistry of tetraethers in the Berau River delta (Kalimantan, Indonesia) |
topic_facet |
GDGT Tetraether Branched GDGT Isoprenoid GDGT BIT index Temperature reconstruction Shelf sea Estuary Soil Riverine organic matter Terrestrial organic matter Surface sediments Berau River Svalbard fjord South China Sea Portuguese margin Kara Sea |
description |
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 (δ13CTOC) 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 (Q50) 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 ... |
author2 |
Organic geochemistry Organic geochemistry & molecular biogeology |
format |
Article in Journal/Newspaper |
author |
Sinninghe Damsté, J.S. |
author_facet |
Sinninghe Damsté, J.S. |
author_sort |
Sinninghe Damsté, J.S. |
title |
Spatial heterogeneity of sources of branched tetraethers in shelf systems: The geochemistry of tetraethers in the Berau River delta (Kalimantan, Indonesia) |
title_short |
Spatial heterogeneity of sources of branched tetraethers in shelf systems: The geochemistry of tetraethers in the Berau River delta (Kalimantan, Indonesia) |
title_full |
Spatial heterogeneity of sources of branched tetraethers in shelf systems: The geochemistry of tetraethers in the Berau River delta (Kalimantan, Indonesia) |
title_fullStr |
Spatial heterogeneity of sources of branched tetraethers in shelf systems: The geochemistry of tetraethers in the Berau River delta (Kalimantan, Indonesia) |
title_full_unstemmed |
Spatial heterogeneity of sources of branched tetraethers in shelf systems: The geochemistry of tetraethers in the Berau River delta (Kalimantan, Indonesia) |
title_sort |
spatial heterogeneity of sources of branched tetraethers in shelf systems: the geochemistry of tetraethers in the berau river delta (kalimantan, indonesia) |
publishDate |
2016 |
url |
https://dspace.library.uu.nl/handle/1874/347537 |
geographic |
Kara Sea Svalbard |
geographic_facet |
Kara Sea Svalbard |
genre |
Kara Sea Svalbard |
genre_facet |
Kara Sea Svalbard |
op_relation |
0016-7037 https://dspace.library.uu.nl/handle/1874/347537 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782336205361250304 |