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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Language: | English |
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University of California Press
2021
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Online Access: | https://hdl.handle.net/20.500.11794/68180 https://doi.org/10.1525/elementa.2020.047 |
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ftunivlavalcorp:oai:corpus.ulaval.ca:20.500.11794/68180 2024-06-23T07:49:54+00:00 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 Archambault, Philippe Brown, Thomas A. Saint-Béat, Blanche Michel, Loïc N. Amiraux, Rémi Nozais, Christian Baffin, Baie de 2021-02-18T12:55:45Z application/pdf https://hdl.handle.net/20.500.11794/68180 https://doi.org/10.1525/elementa.2020.047 eng eng University of California Press 2325-1026 http://hdl.handle.net/20.500.11794/68180 doi:10.1525/elementa.2020.047 http://purl.org/coar/access_right/c_abf2 Benthic food webs Trophic markers Sea-ice algae Climate change HBIs Stable isotopes Baffin Bay Arctic Ocean Écologie marine benthique Climat -- Changements Algues marines Isopenténoïdes Marqueurs biologiques article de recherche COAR1_1::Texte::Périodique::Revue::Contribution à un journal::Article::Article de recherche 2021 ftunivlavalcorp https://doi.org/20.500.11794/6818010.1525/elementa.2020.047 2024-06-03T23:43:59Z 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. Other/Unknown Material Arctic Arctic Ocean Baffin Bay Baffin Bay Baffin Climate change ice algae Sea ice Université Laval: CorpusUL Arctic Arctic Ocean Baffin Bay Elementa: Science of the Anthropocene 8 1 |
institution |
Open Polar |
collection |
Université Laval: CorpusUL |
op_collection_id |
ftunivlavalcorp |
language |
English |
topic |
Benthic food webs Trophic markers Sea-ice algae Climate change HBIs Stable isotopes Baffin Bay Arctic Ocean Écologie marine benthique Climat -- Changements Algues marines Isopenténoïdes Marqueurs biologiques |
spellingShingle |
Benthic food webs Trophic markers Sea-ice algae Climate change HBIs Stable isotopes Baffin Bay Arctic Ocean Écologie marine benthique Climat -- Changements Algues marines Isopenténoïdes Marqueurs biologiques Yunda-Guarin, Gustavo Archambault, Philippe Brown, Thomas A. Saint-Béat, Blanche Michel, Loïc N. Amiraux, Rémi Nozais, Christian 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 |
Benthic food webs Trophic markers Sea-ice algae Climate change HBIs Stable isotopes Baffin Bay Arctic Ocean Écologie marine benthique Climat -- Changements Algues marines Isopenténoïdes Marqueurs biologiques |
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. |
format |
Other/Unknown Material |
author |
Yunda-Guarin, Gustavo Archambault, Philippe Brown, Thomas A. Saint-Béat, Blanche Michel, Loïc N. Amiraux, Rémi Nozais, Christian |
author_facet |
Yunda-Guarin, Gustavo Archambault, Philippe Brown, Thomas A. Saint-Béat, Blanche Michel, Loïc N. Amiraux, Rémi Nozais, Christian |
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 |
University of California Press |
publishDate |
2021 |
url |
https://hdl.handle.net/20.500.11794/68180 https://doi.org/10.1525/elementa.2020.047 |
op_coverage |
Baffin, Baie de |
geographic |
Arctic Arctic Ocean Baffin Bay |
geographic_facet |
Arctic Arctic Ocean Baffin Bay |
genre |
Arctic Arctic Ocean Baffin Bay Baffin Bay Baffin Climate change ice algae Sea ice |
genre_facet |
Arctic Arctic Ocean Baffin Bay Baffin Bay Baffin Climate change ice algae Sea ice |
op_relation |
2325-1026 http://hdl.handle.net/20.500.11794/68180 doi:10.1525/elementa.2020.047 |
op_rights |
http://purl.org/coar/access_right/c_abf2 |
op_doi |
https://doi.org/20.500.11794/6818010.1525/elementa.2020.047 |
container_title |
Elementa: Science of the Anthropocene |
container_volume |
8 |
container_issue |
1 |
_version_ |
1802640622883962880 |