Multiple Trophic Markers Trace Dietary Carbon Sources in Barents Sea Zooplankton During Late Summer
We investigated diets of 24 Barents Sea zooplankton taxa to understand pelagic food-web processes during late summer, including the importance of sea ice algae-produced carbon. This was achieved by combining insights derived from multiple and complementary trophic marker approaches to construct indi...
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Online Access: | http://dx.doi.org/10.3389/fmars.2020.610248 https://www.frontiersin.org/articles/10.3389/fmars.2020.610248/full |
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crfrontiers:10.3389/fmars.2020.610248 2024-09-09T19:32:12+00:00 Multiple Trophic Markers Trace Dietary Carbon Sources in Barents Sea Zooplankton During Late Summer Kohlbach, Doreen Hop, Haakon Wold, Anette Schmidt, Katrin Smik, Lukas Belt, Simon T. Keck Al-Habahbeh, Amalia Woll, Matthias Graeve, Martin Dąbrowska, Anna Maria Tatarek, Agnieszka Atkinson, Angus Assmy, Philipp 2021 http://dx.doi.org/10.3389/fmars.2020.610248 https://www.frontiersin.org/articles/10.3389/fmars.2020.610248/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Marine Science volume 7 ISSN 2296-7745 journal-article 2021 crfrontiers https://doi.org/10.3389/fmars.2020.610248 2024-08-20T04:02:56Z We investigated diets of 24 Barents Sea zooplankton taxa to understand pelagic food-web processes during late summer, including the importance of sea ice algae-produced carbon. This was achieved by combining insights derived from multiple and complementary trophic marker approaches to construct individual aspects of feeding. Specifically, we determined proportions of algal-produced fatty acids (FAs) to reflect the reliance on diatom- versus dinoflagellate-derived carbon, highly branched isoprenoid (HBI) lipids that distinguish between ice-associated and pelagic carbon sources, and sterols to indicate the degree of carnivory. Copepods had the strongest diatom signal based on FAs, while a lack of sea ice algae-associated HBIs (IP 25 , IPSO 25 ) suggested that they fed on pelagic rather than ice-associated diatoms. The amphipod Themisto libellula and the ctenophores Beroë cucumis and Mertensia ovum had a higher contribution of dinoflagellate-produced FAs. There was a high degree of carnivory in this food web, as indicated by the FA carnivory index 18:1( n −9)/18:1( n −7) (mean value < 1 only in the pteropod Clione limacina ), the presence of copepod-associated FAs in most of the taxa, and the absence of algal-produced HBIs in small copepod taxa, such as Oithona similis and Pseudocalanus spp. The coherence between concentrations of HBIs and phytosterols within individuals suggested that phytosterols provide a good additional indication for algal ingestion. Sea ice algae-associated HBIs were detected in six zooplankton species (occurring in krill, amphipods, pteropods, and appendicularians), indicating an overall low to moderate contribution of ice-associated carbon from late-summer sea ice to pelagic consumption. The unexpected occurrence of ice-derived HBIs in pteropods and appendicularians, however, suggests an importance of sedimenting ice-derived material at least for filter feeders within the water column at this time of year. Article in Journal/Newspaper Barents Sea Clione limacina ice algae Sea ice Themisto libellula Copepods Frontiers (Publisher) Barents Sea Frontiers in Marine Science 7 |
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Frontiers (Publisher) |
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description |
We investigated diets of 24 Barents Sea zooplankton taxa to understand pelagic food-web processes during late summer, including the importance of sea ice algae-produced carbon. This was achieved by combining insights derived from multiple and complementary trophic marker approaches to construct individual aspects of feeding. Specifically, we determined proportions of algal-produced fatty acids (FAs) to reflect the reliance on diatom- versus dinoflagellate-derived carbon, highly branched isoprenoid (HBI) lipids that distinguish between ice-associated and pelagic carbon sources, and sterols to indicate the degree of carnivory. Copepods had the strongest diatom signal based on FAs, while a lack of sea ice algae-associated HBIs (IP 25 , IPSO 25 ) suggested that they fed on pelagic rather than ice-associated diatoms. The amphipod Themisto libellula and the ctenophores Beroë cucumis and Mertensia ovum had a higher contribution of dinoflagellate-produced FAs. There was a high degree of carnivory in this food web, as indicated by the FA carnivory index 18:1( n −9)/18:1( n −7) (mean value < 1 only in the pteropod Clione limacina ), the presence of copepod-associated FAs in most of the taxa, and the absence of algal-produced HBIs in small copepod taxa, such as Oithona similis and Pseudocalanus spp. The coherence between concentrations of HBIs and phytosterols within individuals suggested that phytosterols provide a good additional indication for algal ingestion. Sea ice algae-associated HBIs were detected in six zooplankton species (occurring in krill, amphipods, pteropods, and appendicularians), indicating an overall low to moderate contribution of ice-associated carbon from late-summer sea ice to pelagic consumption. The unexpected occurrence of ice-derived HBIs in pteropods and appendicularians, however, suggests an importance of sedimenting ice-derived material at least for filter feeders within the water column at this time of year. |
format |
Article in Journal/Newspaper |
author |
Kohlbach, Doreen Hop, Haakon Wold, Anette Schmidt, Katrin Smik, Lukas Belt, Simon T. Keck Al-Habahbeh, Amalia Woll, Matthias Graeve, Martin Dąbrowska, Anna Maria Tatarek, Agnieszka Atkinson, Angus Assmy, Philipp |
spellingShingle |
Kohlbach, Doreen Hop, Haakon Wold, Anette Schmidt, Katrin Smik, Lukas Belt, Simon T. Keck Al-Habahbeh, Amalia Woll, Matthias Graeve, Martin Dąbrowska, Anna Maria Tatarek, Agnieszka Atkinson, Angus Assmy, Philipp Multiple Trophic Markers Trace Dietary Carbon Sources in Barents Sea Zooplankton During Late Summer |
author_facet |
Kohlbach, Doreen Hop, Haakon Wold, Anette Schmidt, Katrin Smik, Lukas Belt, Simon T. Keck Al-Habahbeh, Amalia Woll, Matthias Graeve, Martin Dąbrowska, Anna Maria Tatarek, Agnieszka Atkinson, Angus Assmy, Philipp |
author_sort |
Kohlbach, Doreen |
title |
Multiple Trophic Markers Trace Dietary Carbon Sources in Barents Sea Zooplankton During Late Summer |
title_short |
Multiple Trophic Markers Trace Dietary Carbon Sources in Barents Sea Zooplankton During Late Summer |
title_full |
Multiple Trophic Markers Trace Dietary Carbon Sources in Barents Sea Zooplankton During Late Summer |
title_fullStr |
Multiple Trophic Markers Trace Dietary Carbon Sources in Barents Sea Zooplankton During Late Summer |
title_full_unstemmed |
Multiple Trophic Markers Trace Dietary Carbon Sources in Barents Sea Zooplankton During Late Summer |
title_sort |
multiple trophic markers trace dietary carbon sources in barents sea zooplankton during late summer |
publisher |
Frontiers Media SA |
publishDate |
2021 |
url |
http://dx.doi.org/10.3389/fmars.2020.610248 https://www.frontiersin.org/articles/10.3389/fmars.2020.610248/full |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Barents Sea Clione limacina ice algae Sea ice Themisto libellula Copepods |
genre_facet |
Barents Sea Clione limacina ice algae Sea ice Themisto libellula Copepods |
op_source |
Frontiers in Marine Science volume 7 ISSN 2296-7745 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/fmars.2020.610248 |
container_title |
Frontiers in Marine Science |
container_volume |
7 |
_version_ |
1809901035297177600 |