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Distribution of living benthic foraminifera in the northern Chukchi Sea

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Abstract

Living (Rose Bengal stained) benthic foraminifera were studied in the topmost sediments of five multi- and box cores collected on the continental shelf, upper and lower slopes, of the Chukchi Sea to provide background information on modern benthic foraminiferal distribution, useful for future studies. Sediment cores were collected during August–September 2015, when the area is seasonally ice-free. Benthic foraminiferal contents in the 63–125 µm and > 125 µm size fractions are discussed in terms of water masses distribution, and sedimentological (grain size) and organic geochemical (total organic carbon, total nitrogen, C/N ratio and δ13Corg) characteristics of the surface sediments. Marine organic carbon-rich clay sediments characterize the faunal microhabitats. Despite relatively high organic carbon contents, standing stocks of living benthic foraminifera are generally low, especially for the 63–125 µm size fraction. This low living stock seems to reflect post-bloom conditions in August and September in the area. The reduced supply of fresh organic carbon also affects faunal microhabitats in the sediment with a concentration of living fauna in the upper 2 cm of the sediment. Over the Chukchi Sea shelf, a relatively mixed upper sediment layer likely due to bioturbation or bio-structures induces a disturbed vertical distribution in the sediment. Corrosive Pacific-derived bottom water over the shelf likely explains the relative importance of agglutinated vs. calcareous fauna in this shallow setting. Our results suggest that, in a post-bloom context, the main environmental control on benthic foraminiferal assemblages in the Chukchi Sea is the nature of the bottom water masses.

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Acknowledgements

This study was conducted under the bilateral visiting program between Korea and France funded by Korean Research Foundation (to SIN, 2014K1A3A1A21001427) and the Campus France PHC Star. We thank the captain and crews of the RV Araon. We are very grateful to Sabine Schmidt who performed the 210Pb analysis and Marie-Claire Perello for the grain-size analysis at EPOC. We also thank Kwangkyu Park at KOPRI for the organic geochemical analyses. We wish to thank Jimmy Daynac for the SEM pictures and the photographic plate. P.-A. Dessandier was supported by The Research Council of Norway through its Center of Excellence funding scheme for CAGE, project number 223259. This paper benefited from the very constructive comments of two anonymous reviewers.

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  1. UMR-EPOC 5805 CNRS, Université de Bordeaux, Allée Geoffroy St Hilaire, 33615, Pessac, France

    Calypso Racine, Jérôme Bonnin, Jacques Giraudeau & Maude Biguenet

  2. Division of Polar Paleoenvironment, Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, 21990, Incheon, Republic of Korea

    Seung-Il Nam & Jung-Hyun Kim

  3. Department of Geosciences, CAGE-Centre for Arctic Gas Hydrate, Environment and Climate, UiT The Arctic University of Norway in Tromsø, Tromsø, Norway

    Pierre-Antoine Dessandier

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  1. Calypso Racine
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Racine, C., Bonnin, J., Nam, SI. et al. Distribution of living benthic foraminifera in the northern Chukchi Sea. Arktos 4, 1–15 (2018). https://doi.org/10.1007/s41063-018-0062-y

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