Contrasting pelagic ecosystem functioning in eastern and western Baffin Bay revealed by trophic network modeling

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published 104332 2 317874 document 104332 lightbox.jpg image/png 0724b8b717db3bc48ba2735e12fe29d6 MD5 55759 2023-12-21 10:06:42 https://pure.iiasa.ac.at/id/eprint/19374/2/lightbox.jpg 19374 2 2 image/png other Thumbnails conversion from text to thumbnail_lightbox en public

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http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/104321 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/104321 http://eprints.org/relation/isIndexCodesVersionOf https://pure.iiasa.ac.at/id/document/104321 archive 2 disk0/00/01/93/74 2023-12-21 09:59:21 2023-12-21 09:59:21 2023-12-21 09:59:21 article show Saint-Béat B. Fath B.D. 7597 0000-0001-9440-6842 Aubry C. Colombet J. Dinasquet J. Fortier L. Galindo V. Grondin P.-L. Joux F. Lalande C. LeBlanc M. Raimbault P. Sime-Ngando T. Tremblay J.-E. Vaulot D. Maps F. Babin M. Deming J.W. Bowman J. Contrasting pelagic ecosystem functioning in eastern and western Baffin Bay revealed by trophic network modeling pub prog_asa Food web modeling; Network analysis; Carbon cycle; Ecosystem functioning; Baffin bay; Arctic ocean 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. 2020-01 doi:10.1525/elementa.397 84 public Elem Sci Anth 8 1 TRUE 2325-1026 https://doi.org/10.17882/59892 data info:eu-repo/semantics/article