Reliance of deep-sea benthic macrofauna on ice-derived organic matter highlighted by multiple trophic markers during spring in Baffin Bay, Canadian Arctic
Benthic organisms depend primarily on seasonal pulses of organic matter from primary producers. In the Arctic, declines in sea ice due to warming climate could lead to changes in this food supply with as yet unknown effects on benthic trophic dynamics. Benthic consumer diets and food web structure w...
Published in: | Elementa: Science of the Anthropocene |
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Online Access: | https://hal.science/hal-04202676 https://doi.org/10.1525/elementa.2020.047 |
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ftccsdartic:oai:HAL:hal-04202676v1 2023-10-09T21:48:44+02:00 Reliance of deep-sea benthic macrofauna on ice-derived organic matter highlighted by multiple trophic markers during spring in Baffin Bay, Canadian Arctic Yunda-Guarin, Gustavo Brown, Thomas A. Michel, Loic Saint-Béat, Blanche Amiraux, Rémi Nozais, Christian Archambault, Philippe Laboratoire Environnement Profond (LEP) Etudes des Ecosystèmes Profonds (EEP) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) 2020 https://hal.science/hal-04202676 https://doi.org/10.1525/elementa.2020.047 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.1525/elementa.2020.047 hal-04202676 https://hal.science/hal-04202676 doi:10.1525/elementa.2020.047 ISSN: 2325-1026 Elementa-science Of The Anthropocene https://hal.science/hal-04202676 Elementa-science Of The Anthropocene, 2020, 8 (1), 18p. ⟨10.1525/elementa.2020.047⟩ [SDV]Life Sciences [q-bio] info:eu-repo/semantics/article Journal articles 2020 ftccsdartic https://doi.org/10.1525/elementa.2020.047 2023-09-23T22:54:09Z Benthic organisms depend primarily on seasonal pulses of organic matter from primary producers. In the Arctic, declines in sea ice due to warming climate could lead to changes in this food supply with as yet unknown effects on benthic trophic dynamics. Benthic consumer diets and food web structure were studied in a seasonally ice-covered region of Baffin Bay during spring 2016 at stations ranging in depth from 199 to 2,111 m. We used a novel combination of highly branched isoprenoid (HBI) lipid biomarkers and stable isotope ratios (δ13C, δ15N) to better understand the relationship between the availability of carbon sources in spring on the seafloor and their assimilation and transfer within the benthic food web. Organic carbon from sea ice (sympagic carbon [SC]) was an important food source for benthic consumers. The lipid biomarker analyses revealed a high relative contribution of SC in sediments (mean SC% ± standard deviation [SD] = 86% ± 16.0, n = 17) and in benthic consumer tissues (mean SC% ± SD = 78% ± 19.7, n = 159). We also detected an effect of sea-ice concentration on the relative contribution of SC in sediment and in benthic consumers. Cluster analysis separated the study region into three different zones according to the relative proportions of SC assimilated by benthic macrofauna. We observed variation of the benthic food web between zones, with increases in the width of the ecological niche in zones with less sea-ice concentration, indicating greater diversity of carbon sources assimilated by consumers. In zones with greater sea-ice concentration, the higher availability of SC increased the ecological role that primary consumers play in driving a stronger transfer of nutrients to higher trophic levels. Based on our results, SC is an important energy source for Arctic deep-sea benthos in Baffin Bay, such that changes in spring sea-ice phenology could alter benthic food-web structure. Article in Journal/Newspaper Arctic Baffin Bay Baffin Bay Baffin Sea ice Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic Baffin Bay Elementa: Science of the Anthropocene 8 1 |
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Open Polar |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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ftccsdartic |
language |
English |
topic |
[SDV]Life Sciences [q-bio] |
spellingShingle |
[SDV]Life Sciences [q-bio] Yunda-Guarin, Gustavo Brown, Thomas A. Michel, Loic Saint-Béat, Blanche Amiraux, Rémi Nozais, Christian Archambault, Philippe Reliance of deep-sea benthic macrofauna on ice-derived organic matter highlighted by multiple trophic markers during spring in Baffin Bay, Canadian Arctic |
topic_facet |
[SDV]Life Sciences [q-bio] |
description |
Benthic organisms depend primarily on seasonal pulses of organic matter from primary producers. In the Arctic, declines in sea ice due to warming climate could lead to changes in this food supply with as yet unknown effects on benthic trophic dynamics. Benthic consumer diets and food web structure were studied in a seasonally ice-covered region of Baffin Bay during spring 2016 at stations ranging in depth from 199 to 2,111 m. We used a novel combination of highly branched isoprenoid (HBI) lipid biomarkers and stable isotope ratios (δ13C, δ15N) to better understand the relationship between the availability of carbon sources in spring on the seafloor and their assimilation and transfer within the benthic food web. Organic carbon from sea ice (sympagic carbon [SC]) was an important food source for benthic consumers. The lipid biomarker analyses revealed a high relative contribution of SC in sediments (mean SC% ± standard deviation [SD] = 86% ± 16.0, n = 17) and in benthic consumer tissues (mean SC% ± SD = 78% ± 19.7, n = 159). We also detected an effect of sea-ice concentration on the relative contribution of SC in sediment and in benthic consumers. Cluster analysis separated the study region into three different zones according to the relative proportions of SC assimilated by benthic macrofauna. We observed variation of the benthic food web between zones, with increases in the width of the ecological niche in zones with less sea-ice concentration, indicating greater diversity of carbon sources assimilated by consumers. In zones with greater sea-ice concentration, the higher availability of SC increased the ecological role that primary consumers play in driving a stronger transfer of nutrients to higher trophic levels. Based on our results, SC is an important energy source for Arctic deep-sea benthos in Baffin Bay, such that changes in spring sea-ice phenology could alter benthic food-web structure. |
author2 |
Laboratoire Environnement Profond (LEP) Etudes des Ecosystèmes Profonds (EEP) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) |
format |
Article in Journal/Newspaper |
author |
Yunda-Guarin, Gustavo Brown, Thomas A. Michel, Loic Saint-Béat, Blanche Amiraux, Rémi Nozais, Christian Archambault, Philippe |
author_facet |
Yunda-Guarin, Gustavo Brown, Thomas A. Michel, Loic Saint-Béat, Blanche Amiraux, Rémi Nozais, Christian Archambault, Philippe |
author_sort |
Yunda-Guarin, Gustavo |
title |
Reliance of deep-sea benthic macrofauna on ice-derived organic matter highlighted by multiple trophic markers during spring in Baffin Bay, Canadian Arctic |
title_short |
Reliance of deep-sea benthic macrofauna on ice-derived organic matter highlighted by multiple trophic markers during spring in Baffin Bay, Canadian Arctic |
title_full |
Reliance of deep-sea benthic macrofauna on ice-derived organic matter highlighted by multiple trophic markers during spring in Baffin Bay, Canadian Arctic |
title_fullStr |
Reliance of deep-sea benthic macrofauna on ice-derived organic matter highlighted by multiple trophic markers during spring in Baffin Bay, Canadian Arctic |
title_full_unstemmed |
Reliance of deep-sea benthic macrofauna on ice-derived organic matter highlighted by multiple trophic markers during spring in Baffin Bay, Canadian Arctic |
title_sort |
reliance of deep-sea benthic macrofauna on ice-derived organic matter highlighted by multiple trophic markers during spring in baffin bay, canadian arctic |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-04202676 https://doi.org/10.1525/elementa.2020.047 |
geographic |
Arctic Baffin Bay |
geographic_facet |
Arctic Baffin Bay |
genre |
Arctic Baffin Bay Baffin Bay Baffin Sea ice |
genre_facet |
Arctic Baffin Bay Baffin Bay Baffin Sea ice |
op_source |
ISSN: 2325-1026 Elementa-science Of The Anthropocene https://hal.science/hal-04202676 Elementa-science Of The Anthropocene, 2020, 8 (1), 18p. ⟨10.1525/elementa.2020.047⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1525/elementa.2020.047 hal-04202676 https://hal.science/hal-04202676 doi:10.1525/elementa.2020.047 |
op_doi |
https://doi.org/10.1525/elementa.2020.047 |
container_title |
Elementa: Science of the Anthropocene |
container_volume |
8 |
container_issue |
1 |
_version_ |
1779311810348843008 |