Contrasting pelagic ecosystem functioning in eastern and western Baffin Bay revealed by trophic network modeling
Baffin Bay, located at the Arctic Ocean’s ‘doorstep’, is a heterogeneous environment where a warm and salty eastern current flows northwards in the opposite direction of a cold and relatively fresh Arctic current flowing along the west coast of the bay. This circulation affects the physical and biog...
Published in: | Elementa: Science of the Anthropocene |
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ftdoajarticles:oai:doaj.org/article:55892ec7942b41a192cb412e8a0fbb84 2023-05-15T14:56:45+02:00 Contrasting pelagic ecosystem functioning in eastern and western Baffin Bay revealed by trophic network modeling Blanche Saint-Béat Brian D. Fath Cyril Aubry Jonathan Colombet Julie Dinasquet Louis Fortier Virginie Galindo Pierre-Luc Grondin Fabien Joux Catherine Lalande Mathieu LeBlanc Patrick Raimbault Télesphore Sime-Ngando Jean-Eric Tremblay Daniel Vaulot Frédéric Maps Marcel Babin 2020-01-01T00:00:00Z https://doi.org/10.1525/elementa.397 https://doaj.org/article/55892ec7942b41a192cb412e8a0fbb84 EN eng BioOne https://www.elementascience.org/articles/397 https://doaj.org/toc/2325-1026 2325-1026 doi:10.1525/elementa.397 https://doaj.org/article/55892ec7942b41a192cb412e8a0fbb84 Elementa: Science of the Anthropocene, Vol 8, Iss 1 (2020) food web modeling network analysis carbon cycle ecosystem functioning baffin bay arctic ocean Environmental sciences GE1-350 article 2020 ftdoajarticles https://doi.org/10.1525/elementa.397 2022-12-31T08:57:01Z Baffin Bay, located at the Arctic Ocean’s ‘doorstep’, is a heterogeneous environment where a warm and salty eastern current flows northwards in the opposite direction of a cold and relatively fresh Arctic current flowing along the west coast of the bay. This circulation affects the physical and biogeochemical environment on both sides of the bay. The phytoplanktonic species composition is driven by its environment and, in turn, shapes carbon transfer through the planktonic food web. This study aims at determining the effects of such contrasting environments on ecosystem structure and functioning and the consequences for the carbon cycle. Ecological indices calculated from food web flow values provide ecosystem properties that are not accessible by direct in situ measurement. From new biological data gathered during the Green Edge project, we built a planktonic food web model for each side of Baffin Bay, considering several biological processes involved in the carbon cycle, notably in the gravitational, lipid, and microbial carbon pumps. Missing flow values were estimated by linear inverse modeling. Calculated ecological network analysis indices revealed significant differences in the functioning of each ecosystem. The eastern Baffin Bay food web presents a more specialized food web that constrains carbon through specific and efficient pathways, leading to segregation of the microbial loop from the classical grazing chain. In contrast, the western food web showed redundant and shorter pathways that caused a higher carbon export, especially via lipid and microbial pumps, and thus promoted carbon sequestration. Moreover, indirect effects resulting from bottom-up and top-down control impacted pairwise relations between species differently and led to the dominance of mutualism in the eastern food web. These differences in pairwise relations affect the dynamics and evolution of each food web and thus might lead to contrasting responses to ongoing climate change. Article in Journal/Newspaper Arctic Arctic Ocean Baffin Bay Baffin Bay Baffin Climate change Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean Baffin Bay Elementa: Science of the Anthropocene 8 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
food web modeling network analysis carbon cycle ecosystem functioning baffin bay arctic ocean Environmental sciences GE1-350 |
spellingShingle |
food web modeling network analysis carbon cycle ecosystem functioning baffin bay arctic ocean Environmental sciences GE1-350 Blanche Saint-Béat Brian D. Fath Cyril Aubry Jonathan Colombet Julie Dinasquet Louis Fortier Virginie Galindo Pierre-Luc Grondin Fabien Joux Catherine Lalande Mathieu LeBlanc Patrick Raimbault Télesphore Sime-Ngando Jean-Eric Tremblay Daniel Vaulot Frédéric Maps Marcel Babin Contrasting pelagic ecosystem functioning in eastern and western Baffin Bay revealed by trophic network modeling |
topic_facet |
food web modeling network analysis carbon cycle ecosystem functioning baffin bay arctic ocean Environmental sciences GE1-350 |
description |
Baffin Bay, located at the Arctic Ocean’s ‘doorstep’, is a heterogeneous environment where a warm and salty eastern current flows northwards in the opposite direction of a cold and relatively fresh Arctic current flowing along the west coast of the bay. This circulation affects the physical and biogeochemical environment on both sides of the bay. The phytoplanktonic species composition is driven by its environment and, in turn, shapes carbon transfer through the planktonic food web. This study aims at determining the effects of such contrasting environments on ecosystem structure and functioning and the consequences for the carbon cycle. Ecological indices calculated from food web flow values provide ecosystem properties that are not accessible by direct in situ measurement. From new biological data gathered during the Green Edge project, we built a planktonic food web model for each side of Baffin Bay, considering several biological processes involved in the carbon cycle, notably in the gravitational, lipid, and microbial carbon pumps. Missing flow values were estimated by linear inverse modeling. Calculated ecological network analysis indices revealed significant differences in the functioning of each ecosystem. The eastern Baffin Bay food web presents a more specialized food web that constrains carbon through specific and efficient pathways, leading to segregation of the microbial loop from the classical grazing chain. In contrast, the western food web showed redundant and shorter pathways that caused a higher carbon export, especially via lipid and microbial pumps, and thus promoted carbon sequestration. Moreover, indirect effects resulting from bottom-up and top-down control impacted pairwise relations between species differently and led to the dominance of mutualism in the eastern food web. These differences in pairwise relations affect the dynamics and evolution of each food web and thus might lead to contrasting responses to ongoing climate change. |
format |
Article in Journal/Newspaper |
author |
Blanche Saint-Béat Brian D. Fath Cyril Aubry Jonathan Colombet Julie Dinasquet Louis Fortier Virginie Galindo Pierre-Luc Grondin Fabien Joux Catherine Lalande Mathieu LeBlanc Patrick Raimbault Télesphore Sime-Ngando Jean-Eric Tremblay Daniel Vaulot Frédéric Maps Marcel Babin |
author_facet |
Blanche Saint-Béat Brian D. Fath Cyril Aubry Jonathan Colombet Julie Dinasquet Louis Fortier Virginie Galindo Pierre-Luc Grondin Fabien Joux Catherine Lalande Mathieu LeBlanc Patrick Raimbault Télesphore Sime-Ngando Jean-Eric Tremblay Daniel Vaulot Frédéric Maps Marcel Babin |
author_sort |
Blanche Saint-Béat |
title |
Contrasting pelagic ecosystem functioning in eastern and western Baffin Bay revealed by trophic network modeling |
title_short |
Contrasting pelagic ecosystem functioning in eastern and western Baffin Bay revealed by trophic network modeling |
title_full |
Contrasting pelagic ecosystem functioning in eastern and western Baffin Bay revealed by trophic network modeling |
title_fullStr |
Contrasting pelagic ecosystem functioning in eastern and western Baffin Bay revealed by trophic network modeling |
title_full_unstemmed |
Contrasting pelagic ecosystem functioning in eastern and western Baffin Bay revealed by trophic network modeling |
title_sort |
contrasting pelagic ecosystem functioning in eastern and western baffin bay revealed by trophic network modeling |
publisher |
BioOne |
publishDate |
2020 |
url |
https://doi.org/10.1525/elementa.397 https://doaj.org/article/55892ec7942b41a192cb412e8a0fbb84 |
geographic |
Arctic Arctic Ocean Baffin Bay |
geographic_facet |
Arctic Arctic Ocean Baffin Bay |
genre |
Arctic Arctic Ocean Baffin Bay Baffin Bay Baffin Climate change |
genre_facet |
Arctic Arctic Ocean Baffin Bay Baffin Bay Baffin Climate change |
op_source |
Elementa: Science of the Anthropocene, Vol 8, Iss 1 (2020) |
op_relation |
https://www.elementascience.org/articles/397 https://doaj.org/toc/2325-1026 2325-1026 doi:10.1525/elementa.397 https://doaj.org/article/55892ec7942b41a192cb412e8a0fbb84 |
op_doi |
https://doi.org/10.1525/elementa.397 |
container_title |
Elementa: Science of the Anthropocene |
container_volume |
8 |
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1766328836487643136 |