Opportunistic consumption of marine pelagic, terrestrial, and chemosynthetic organic matter by macrofauna on the Arctic shelf: a stable isotope approach
Macrofauna can contribute substantially to the organic matter cycling on the seafloor, yet the role of terrestrial and chemosynthetic organic matter in the diets of microphagous (deposit and suspension) feeders is poorly understood. In the present study, we used stable isotopes of carbon and nitroge...
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ftpubmed:oai:pubmedcentral.nih.gov:10315133 2023-07-30T04:01:58+02:00 Opportunistic consumption of marine pelagic, terrestrial, and chemosynthetic organic matter by macrofauna on the Arctic shelf: a stable isotope approach Kokarev, Valentin Zalota, Anna K. Zuev, Andrey Tiunov, Alexei Kuznetsov, Petr Konovalova, Olga Rimskaya-Korsakova, Nadezhda 2023-06-29 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10315133/ http://www.ncbi.nlm.nih.gov/pubmed/37404477 https://doi.org/10.7717/peerj.15595 en eng PeerJ Inc. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10315133/ http://www.ncbi.nlm.nih.gov/pubmed/37404477 http://dx.doi.org/10.7717/peerj.15595 © 2023 Kokarev et al. https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited. PeerJ Ecology Text 2023 ftpubmed https://doi.org/10.7717/peerj.15595 2023-07-09T00:52:48Z Macrofauna can contribute substantially to the organic matter cycling on the seafloor, yet the role of terrestrial and chemosynthetic organic matter in the diets of microphagous (deposit and suspension) feeders is poorly understood. In the present study, we used stable isotopes of carbon and nitrogen to test the hypothesis that the terrestrial organic matter supplied with river runoff and local chemosynthetic production at methane seeps might be important organic matter sources for macrofaunal consumers on the Laptev Sea shelf. We sampled locations from three habitats with the presumed differences in organic matter supply: “Delta” with terrestrial inputs from the Lena River, “Background” on the northern part of the shelf with pelagic production as the main organic matter source, and “Seep” in the areas with detected methane seepage, where chemosynthetic production might be available. Macrobenthic communities inhabiting each of the habitats were characterized by a distinct isotopic niche, mostly in terms of δ(13)C values, directly reflecting differences in the origin of organic matter supply, while δ(15)N values mostly reflected the feeding group (surface deposit/suspension feeders, subsurface deposit feeders, and carnivores). We conclude that both terrestrial and chemosynthetic organic matter sources might be substitutes for pelagic primary production in the benthic food webs on the largely oligotrophic Laptev Sea shelf. Furthermore, species-specific differences in the isotopic niches of species belonging to the same feeding group are discussed, as well as the isotopic niches of the symbiotrophic tubeworm Oligobrachia sp. and the rissoid gastropod Frigidoalvania sp., which are exclusively associated with methane seeps. Text Arctic laptev Laptev Sea lena river PubMed Central (PMC) Arctic Laptev Sea PeerJ 11 e15595 |
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topic |
Ecology |
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Ecology Kokarev, Valentin Zalota, Anna K. Zuev, Andrey Tiunov, Alexei Kuznetsov, Petr Konovalova, Olga Rimskaya-Korsakova, Nadezhda Opportunistic consumption of marine pelagic, terrestrial, and chemosynthetic organic matter by macrofauna on the Arctic shelf: a stable isotope approach |
topic_facet |
Ecology |
description |
Macrofauna can contribute substantially to the organic matter cycling on the seafloor, yet the role of terrestrial and chemosynthetic organic matter in the diets of microphagous (deposit and suspension) feeders is poorly understood. In the present study, we used stable isotopes of carbon and nitrogen to test the hypothesis that the terrestrial organic matter supplied with river runoff and local chemosynthetic production at methane seeps might be important organic matter sources for macrofaunal consumers on the Laptev Sea shelf. We sampled locations from three habitats with the presumed differences in organic matter supply: “Delta” with terrestrial inputs from the Lena River, “Background” on the northern part of the shelf with pelagic production as the main organic matter source, and “Seep” in the areas with detected methane seepage, where chemosynthetic production might be available. Macrobenthic communities inhabiting each of the habitats were characterized by a distinct isotopic niche, mostly in terms of δ(13)C values, directly reflecting differences in the origin of organic matter supply, while δ(15)N values mostly reflected the feeding group (surface deposit/suspension feeders, subsurface deposit feeders, and carnivores). We conclude that both terrestrial and chemosynthetic organic matter sources might be substitutes for pelagic primary production in the benthic food webs on the largely oligotrophic Laptev Sea shelf. Furthermore, species-specific differences in the isotopic niches of species belonging to the same feeding group are discussed, as well as the isotopic niches of the symbiotrophic tubeworm Oligobrachia sp. and the rissoid gastropod Frigidoalvania sp., which are exclusively associated with methane seeps. |
format |
Text |
author |
Kokarev, Valentin Zalota, Anna K. Zuev, Andrey Tiunov, Alexei Kuznetsov, Petr Konovalova, Olga Rimskaya-Korsakova, Nadezhda |
author_facet |
Kokarev, Valentin Zalota, Anna K. Zuev, Andrey Tiunov, Alexei Kuznetsov, Petr Konovalova, Olga Rimskaya-Korsakova, Nadezhda |
author_sort |
Kokarev, Valentin |
title |
Opportunistic consumption of marine pelagic, terrestrial, and chemosynthetic organic matter by macrofauna on the Arctic shelf: a stable isotope approach |
title_short |
Opportunistic consumption of marine pelagic, terrestrial, and chemosynthetic organic matter by macrofauna on the Arctic shelf: a stable isotope approach |
title_full |
Opportunistic consumption of marine pelagic, terrestrial, and chemosynthetic organic matter by macrofauna on the Arctic shelf: a stable isotope approach |
title_fullStr |
Opportunistic consumption of marine pelagic, terrestrial, and chemosynthetic organic matter by macrofauna on the Arctic shelf: a stable isotope approach |
title_full_unstemmed |
Opportunistic consumption of marine pelagic, terrestrial, and chemosynthetic organic matter by macrofauna on the Arctic shelf: a stable isotope approach |
title_sort |
opportunistic consumption of marine pelagic, terrestrial, and chemosynthetic organic matter by macrofauna on the arctic shelf: a stable isotope approach |
publisher |
PeerJ Inc. |
publishDate |
2023 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10315133/ http://www.ncbi.nlm.nih.gov/pubmed/37404477 https://doi.org/10.7717/peerj.15595 |
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Arctic Laptev Sea |
geographic_facet |
Arctic Laptev Sea |
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Arctic laptev Laptev Sea lena river |
genre_facet |
Arctic laptev Laptev Sea lena river |
op_source |
PeerJ |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10315133/ http://www.ncbi.nlm.nih.gov/pubmed/37404477 http://dx.doi.org/10.7717/peerj.15595 |
op_rights |
© 2023 Kokarev et al. https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited. |
op_doi |
https://doi.org/10.7717/peerj.15595 |
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11 |
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