Distribution of Living Benthic Foraminifera in the Baffin Bay and Nares Strait in the Summer and Fall Periods: Relation with Environmental Parameters

Type Article
Date 2023-11
Language English
Author(s) Racine Calypso1, Bonnin JérômeORCID1, Dessandier Pierre-AntoineORCID2, Giraudeau JacquesORCID1
Affiliation(s) 1 : Université de Bordeaux, CNRS, UMR 5805 Environnements et Paléoenvironnements Océaniques et Continentaux, 33615 Pessac, France
2 : Université de Brest, CNRS, Ifremer, UMR 6197 Biologie et Ecologie des Ecosystèmes Marins Profonds, 29280 Plouzané, France
Source Journal Of Marine Science And Engineering (2077-1312) (MDPI AG), 2023-11 , Vol. 11 , N. 11 , P. 2049 (22p.)
DOI 10.3390/jmse11112049
Note This article belongs to the Special Issue Foraminifera in the Sedimentary Record as Proxies of Climate Change, Environmental Stress and Anthropogenic Impact
Keyword(s) living benthic foraminifera, Arctic, Nares Strait, sea ice
Abstract

Arctic climate warming leads to drastic changes in sea ice dynamics, hence impacting primary productivity but also the benthic communities. Therefore, to assess the response of living benthic foraminifera to contrasting Arctic environments, surface sediments from nine stations were collected during the summer of 2014 and fall of 2015 in the Baffin Bay and Nares Strait. Living standing stock are systematically low in the eastern and western Baffin Bay and much higher in the North Water Polynya and the Kane Basin located at the entrance and in the center of Nares Strait, respectively. High living benthic foraminiferal densities in the NOW reflect higher TOC while the highest density in the Kane Basin coincides with lower TOC but higher C/N and higher δ13Corg. The contribution of agglutinated species is on average very high for the whole study area and dominated by the species Adercotryma glomeratum, Lagenammina arenulata, and Reophax scorpiurus. Calcareous species, dominated by Nonionellina labradorica and Melonis barleeanus, are more abundant in the North Water Polynya and the Kane Basin. The very high living standing stock observed in the Kane Basin might be related to the northern position of the ice arch that summer during 2014 and therefore a particularly scarce sea ice cover might have allowed massive phytoplankton production during that season. In this study, the distribution of living benthic foraminifera is discussed according to several environmental parameters such as water masses, phytoplankton productivity, and organic matter fluxes.

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Racine Calypso, Bonnin Jérôme, Dessandier Pierre-Antoine, Giraudeau Jacques (2023). Distribution of Living Benthic Foraminifera in the Baffin Bay and Nares Strait in the Summer and Fall Periods: Relation with Environmental Parameters. Journal Of Marine Science And Engineering, 11(11), 2049 (22p.). Publisher's official version : https://doi.org/10.3390/jmse11112049 , Open Access version : https://archimer.ifremer.fr/doc/00859/97065/