The distribution of deep-sea benthic foraminifera in core tops from the eastern Indian Ocean
Relative abundances of benthic foraminifera in 57 core tops collected within a depth-range between 700 and 4335 m below sea level [b.s.l.] from the eastern Indian Ocean (mostly between Australia and Indonesia) were investigated quantitatively using Detrended Correspondence Analysis (DCA) to analyse...
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ftanucanberra:oai:digitalcollections.anu.edu.au:1885/73808 2023-05-15T13:36:33+02:00 The distribution of deep-sea benthic foraminifera in core tops from the eastern Indian Ocean Murgese, David De Deckker, Patrick 2015-12-13T22:27:08Z http://hdl.handle.net/1885/73808 unknown Elsevier 0377-8398 http://hdl.handle.net/1885/73808 Marine Micropaleontology Keywords: benthic foraminifera canonical analysis micropaleontology paleoenvironment Indian Ocean Indian Ocean (East) oceanic regions World Cibicidoides Epistominella exigua Foraminifera Nummoloculina irregularis Oridorsalis tener Pyrgo murrhina Uvige Bathymetry Benthic foraminifera Carbon flux CCA DCA Dissolved oxygen Eastern Indian Ocean Indonesia Indonesian Throughflow Nutrients Primary productivity Western Australia Journal article 2015 ftanucanberra 2015-12-28T23:36:01Z Relative abundances of benthic foraminifera in 57 core tops collected within a depth-range between 700 and 4335 m below sea level [b.s.l.] from the eastern Indian Ocean (mostly between Australia and Indonesia) were investigated quantitatively using Detrended Correspondence Analysis (DCA) to analyse species spatial-distribution. Canonical Correspondence Analysis (CCA) and correlation matrices were used to evaluate the relationships between the species distribution and environmental variables (temperature, salinity, dissolved oxygen, nitrate and phosphate concentrations, carbon-flux rate). Seven key-species proved useful for distinguishing environmental parameters. Two groups of species are identified by means of the first DCA ordination axis. The first group increases in relative abundances with depth and includes three taxa: Oridorsalis tener umbonatus, Epistominella exigua and Pyrgo murrhina. These three taxa prefer a cold (< 3°C) and well-oxygenated (> 3.5 ml/l) environment, with low carbon flux to the sea floor (< 3 g C m-2 year-1). O. tener umbonatus and P. murrhina tend to indicate reduced food availability, whereas E. exigua may indicate periodic delivery (seasonal) of organic matter to the sea floor. The second group includes Nummoloculina irregularis and Cibicidoides pseudoungerianus, typical of upper-bathyal depths. C. pseudoungerianus is correlated with a warm (> 2.5°C) environment characterised by high carbon-flux rate (> 2.5 g C m-2 year -1). N. irregularis is associated with high dissolved-oxygen concentrations (>3 ml/l) and its distribution is limited to south of 20°S. In this area, the contemporary presence of the low salinity and well oxygenated Antarctic Intermediate Water and low primary productivity at the sea-surface (which causes low oxygen consumption at the sea floor) create the ideal conditions for this species. The second ordination-axis scores identify another taxon, Uvigerina proboscidea. The distribution of this species is mainly limited to low latitudes (north of 25°S), where carbon flux rate is high (> 3.5 g C m-2 year-1), due to higher primary productivity levels at the sea surface, and oxygen levels are low (<3 ml/l) due to the organic matter oxidation and the presence of oxygen-depleted Indonesian Intermediate Water and North Indian Intermediate Water. Article in Journal/Newspaper Antarc* Antarctic Australian National University: ANU Digital Collections Antarctic Indian |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
topic |
Keywords: benthic foraminifera canonical analysis micropaleontology paleoenvironment Indian Ocean Indian Ocean (East) oceanic regions World Cibicidoides Epistominella exigua Foraminifera Nummoloculina irregularis Oridorsalis tener Pyrgo murrhina Uvige Bathymetry Benthic foraminifera Carbon flux CCA DCA Dissolved oxygen Eastern Indian Ocean Indonesia Indonesian Throughflow Nutrients Primary productivity Western Australia |
spellingShingle |
Keywords: benthic foraminifera canonical analysis micropaleontology paleoenvironment Indian Ocean Indian Ocean (East) oceanic regions World Cibicidoides Epistominella exigua Foraminifera Nummoloculina irregularis Oridorsalis tener Pyrgo murrhina Uvige Bathymetry Benthic foraminifera Carbon flux CCA DCA Dissolved oxygen Eastern Indian Ocean Indonesia Indonesian Throughflow Nutrients Primary productivity Western Australia Murgese, David De Deckker, Patrick The distribution of deep-sea benthic foraminifera in core tops from the eastern Indian Ocean |
topic_facet |
Keywords: benthic foraminifera canonical analysis micropaleontology paleoenvironment Indian Ocean Indian Ocean (East) oceanic regions World Cibicidoides Epistominella exigua Foraminifera Nummoloculina irregularis Oridorsalis tener Pyrgo murrhina Uvige Bathymetry Benthic foraminifera Carbon flux CCA DCA Dissolved oxygen Eastern Indian Ocean Indonesia Indonesian Throughflow Nutrients Primary productivity Western Australia |
description |
Relative abundances of benthic foraminifera in 57 core tops collected within a depth-range between 700 and 4335 m below sea level [b.s.l.] from the eastern Indian Ocean (mostly between Australia and Indonesia) were investigated quantitatively using Detrended Correspondence Analysis (DCA) to analyse species spatial-distribution. Canonical Correspondence Analysis (CCA) and correlation matrices were used to evaluate the relationships between the species distribution and environmental variables (temperature, salinity, dissolved oxygen, nitrate and phosphate concentrations, carbon-flux rate). Seven key-species proved useful for distinguishing environmental parameters. Two groups of species are identified by means of the first DCA ordination axis. The first group increases in relative abundances with depth and includes three taxa: Oridorsalis tener umbonatus, Epistominella exigua and Pyrgo murrhina. These three taxa prefer a cold (< 3°C) and well-oxygenated (> 3.5 ml/l) environment, with low carbon flux to the sea floor (< 3 g C m-2 year-1). O. tener umbonatus and P. murrhina tend to indicate reduced food availability, whereas E. exigua may indicate periodic delivery (seasonal) of organic matter to the sea floor. The second group includes Nummoloculina irregularis and Cibicidoides pseudoungerianus, typical of upper-bathyal depths. C. pseudoungerianus is correlated with a warm (> 2.5°C) environment characterised by high carbon-flux rate (> 2.5 g C m-2 year -1). N. irregularis is associated with high dissolved-oxygen concentrations (>3 ml/l) and its distribution is limited to south of 20°S. In this area, the contemporary presence of the low salinity and well oxygenated Antarctic Intermediate Water and low primary productivity at the sea-surface (which causes low oxygen consumption at the sea floor) create the ideal conditions for this species. The second ordination-axis scores identify another taxon, Uvigerina proboscidea. The distribution of this species is mainly limited to low latitudes (north of 25°S), where carbon flux rate is high (> 3.5 g C m-2 year-1), due to higher primary productivity levels at the sea surface, and oxygen levels are low (<3 ml/l) due to the organic matter oxidation and the presence of oxygen-depleted Indonesian Intermediate Water and North Indian Intermediate Water. |
format |
Article in Journal/Newspaper |
author |
Murgese, David De Deckker, Patrick |
author_facet |
Murgese, David De Deckker, Patrick |
author_sort |
Murgese, David |
title |
The distribution of deep-sea benthic foraminifera in core tops from the eastern Indian Ocean |
title_short |
The distribution of deep-sea benthic foraminifera in core tops from the eastern Indian Ocean |
title_full |
The distribution of deep-sea benthic foraminifera in core tops from the eastern Indian Ocean |
title_fullStr |
The distribution of deep-sea benthic foraminifera in core tops from the eastern Indian Ocean |
title_full_unstemmed |
The distribution of deep-sea benthic foraminifera in core tops from the eastern Indian Ocean |
title_sort |
distribution of deep-sea benthic foraminifera in core tops from the eastern indian ocean |
publisher |
Elsevier |
publishDate |
2015 |
url |
http://hdl.handle.net/1885/73808 |
geographic |
Antarctic Indian |
geographic_facet |
Antarctic Indian |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Marine Micropaleontology |
op_relation |
0377-8398 http://hdl.handle.net/1885/73808 |
_version_ |
1766080288557891584 |