Benthic Oxygen Uptake in the Arctic Ocean Margins - A Case Study at the Deep-Sea Observatory HAUSGARTEN (Fram Strait)
The past decades have seen remarkable changes in the Arctic, a hotspot for climate change. Nevertheless, impacts of such changes on the biogeochemical cycles and Arctic marine ecosystems are still largely unknown. During cruises to the deep-sea observatory HAUSGARTEN in July 2007 and 2008, we invest...
Published in: | PLOS ONE |
---|---|
Main Authors: | , , , , |
Format: | Text |
Language: | English |
Published: |
Public Library of Science
2015
|
Subjects: | |
Online Access: | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4605737/ http://www.ncbi.nlm.nih.gov/pubmed/26465885 https://doi.org/10.1371/journal.pone.0138339 |
id |
ftpubmed:oai:pubmedcentral.nih.gov:4605737 |
---|---|
record_format |
openpolar |
spelling |
ftpubmed:oai:pubmedcentral.nih.gov:4605737 2023-05-15T14:50:09+02:00 Benthic Oxygen Uptake in the Arctic Ocean Margins - A Case Study at the Deep-Sea Observatory HAUSGARTEN (Fram Strait) Cathalot, Cecile Rabouille, Christophe Sauter, Eberhard Schewe, Ingo Soltwedel, Thomas 2015-10-14 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4605737/ http://www.ncbi.nlm.nih.gov/pubmed/26465885 https://doi.org/10.1371/journal.pone.0138339 en eng Public Library of Science http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4605737/ http://www.ncbi.nlm.nih.gov/pubmed/26465885 http://dx.doi.org/10.1371/journal.pone.0138339 http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited CC-BY Research Article Text 2015 ftpubmed https://doi.org/10.1371/journal.pone.0138339 2015-11-01T01:16:03Z The past decades have seen remarkable changes in the Arctic, a hotspot for climate change. Nevertheless, impacts of such changes on the biogeochemical cycles and Arctic marine ecosystems are still largely unknown. During cruises to the deep-sea observatory HAUSGARTEN in July 2007 and 2008, we investigated the biogeochemical recycling of organic matter in Arctic margin sediments by performing shipboard measurements of oxygen profiles, bacterial activities and biogenic sediment compounds (pigment, protein, organic carbon, and phospholipid contents). Additional in situ oxygen profiles were performed at two sites. This study aims at characterizing benthic mineralization activity along local bathymetric and latitudinal transects. The spatial coverage of this study is unique since it focuses on the transition from shelf to Deep Ocean, and from close to the ice edge to more open waters. Biogeochemical recycling across the continental margin showed a classical bathymetric pattern with overall low fluxes except for the deepest station located in the Molloy Hole (5500 m), a seafloor depression acting as an organic matter depot center. A gradient in benthic mineralization rates arises along the latitudinal transect with clearly higher values at the southern stations (average diffusive oxygen uptake of 0.49 ± 0.18 mmol O2 m-2 d-1) compared to the northern sites (0.22 ± 0.09 mmol O2 m-2 d-1). The benthic mineralization activity at the HAUSGARTEN observatory thus increases southward and appears to reflect the amount of organic matter reaching the seafloor rather than its lability. Although organic matter content and potential bacterial activity clearly follow this gradient, sediment pigments and phospholipids exhibit no increase with latitude whereas satellite images of surface ocean chlorophyll a indicate local seasonal patterns of primary production. Our results suggest that predicted increases in primary production in the Arctic Ocean could induce a larger export of more refractory organic matter due to the longer ... Text Arctic Arctic Ocean Climate change Fram Strait PubMed Central (PMC) Arctic Arctic Ocean Molloy ENVELOPE(70.065,70.065,-49.360,-49.360) Molloy Hole ENVELOPE(2.817,2.817,79.137,79.137) PLOS ONE 10 10 e0138339 |
institution |
Open Polar |
collection |
PubMed Central (PMC) |
op_collection_id |
ftpubmed |
language |
English |
topic |
Research Article |
spellingShingle |
Research Article Cathalot, Cecile Rabouille, Christophe Sauter, Eberhard Schewe, Ingo Soltwedel, Thomas Benthic Oxygen Uptake in the Arctic Ocean Margins - A Case Study at the Deep-Sea Observatory HAUSGARTEN (Fram Strait) |
topic_facet |
Research Article |
description |
The past decades have seen remarkable changes in the Arctic, a hotspot for climate change. Nevertheless, impacts of such changes on the biogeochemical cycles and Arctic marine ecosystems are still largely unknown. During cruises to the deep-sea observatory HAUSGARTEN in July 2007 and 2008, we investigated the biogeochemical recycling of organic matter in Arctic margin sediments by performing shipboard measurements of oxygen profiles, bacterial activities and biogenic sediment compounds (pigment, protein, organic carbon, and phospholipid contents). Additional in situ oxygen profiles were performed at two sites. This study aims at characterizing benthic mineralization activity along local bathymetric and latitudinal transects. The spatial coverage of this study is unique since it focuses on the transition from shelf to Deep Ocean, and from close to the ice edge to more open waters. Biogeochemical recycling across the continental margin showed a classical bathymetric pattern with overall low fluxes except for the deepest station located in the Molloy Hole (5500 m), a seafloor depression acting as an organic matter depot center. A gradient in benthic mineralization rates arises along the latitudinal transect with clearly higher values at the southern stations (average diffusive oxygen uptake of 0.49 ± 0.18 mmol O2 m-2 d-1) compared to the northern sites (0.22 ± 0.09 mmol O2 m-2 d-1). The benthic mineralization activity at the HAUSGARTEN observatory thus increases southward and appears to reflect the amount of organic matter reaching the seafloor rather than its lability. Although organic matter content and potential bacterial activity clearly follow this gradient, sediment pigments and phospholipids exhibit no increase with latitude whereas satellite images of surface ocean chlorophyll a indicate local seasonal patterns of primary production. Our results suggest that predicted increases in primary production in the Arctic Ocean could induce a larger export of more refractory organic matter due to the longer ... |
format |
Text |
author |
Cathalot, Cecile Rabouille, Christophe Sauter, Eberhard Schewe, Ingo Soltwedel, Thomas |
author_facet |
Cathalot, Cecile Rabouille, Christophe Sauter, Eberhard Schewe, Ingo Soltwedel, Thomas |
author_sort |
Cathalot, Cecile |
title |
Benthic Oxygen Uptake in the Arctic Ocean Margins - A Case Study at the Deep-Sea Observatory HAUSGARTEN (Fram Strait) |
title_short |
Benthic Oxygen Uptake in the Arctic Ocean Margins - A Case Study at the Deep-Sea Observatory HAUSGARTEN (Fram Strait) |
title_full |
Benthic Oxygen Uptake in the Arctic Ocean Margins - A Case Study at the Deep-Sea Observatory HAUSGARTEN (Fram Strait) |
title_fullStr |
Benthic Oxygen Uptake in the Arctic Ocean Margins - A Case Study at the Deep-Sea Observatory HAUSGARTEN (Fram Strait) |
title_full_unstemmed |
Benthic Oxygen Uptake in the Arctic Ocean Margins - A Case Study at the Deep-Sea Observatory HAUSGARTEN (Fram Strait) |
title_sort |
benthic oxygen uptake in the arctic ocean margins - a case study at the deep-sea observatory hausgarten (fram strait) |
publisher |
Public Library of Science |
publishDate |
2015 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4605737/ http://www.ncbi.nlm.nih.gov/pubmed/26465885 https://doi.org/10.1371/journal.pone.0138339 |
long_lat |
ENVELOPE(70.065,70.065,-49.360,-49.360) ENVELOPE(2.817,2.817,79.137,79.137) |
geographic |
Arctic Arctic Ocean Molloy Molloy Hole |
geographic_facet |
Arctic Arctic Ocean Molloy Molloy Hole |
genre |
Arctic Arctic Ocean Climate change Fram Strait |
genre_facet |
Arctic Arctic Ocean Climate change Fram Strait |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4605737/ http://www.ncbi.nlm.nih.gov/pubmed/26465885 http://dx.doi.org/10.1371/journal.pone.0138339 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1371/journal.pone.0138339 |
container_title |
PLOS ONE |
container_volume |
10 |
container_issue |
10 |
container_start_page |
e0138339 |
_version_ |
1766321205459025920 |