Distribution of living benthic foraminifera in the northern Chukchi Sea
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 studie...
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ftoskarbordeaux:oai:oskar-bordeaux.fr:20.500.12278/199771 2024-06-16T07:39:24+00:00 Distribution of living benthic foraminifera in the northern Chukchi Sea RACINE, Calypso BONNIN, Jerome NAM, Seung-Il GIRAUDEAU, Jacques BIGUENET, Maude DESSANDIER, Pierre-Antoine KIM, Jung-Hyun 2018-12 https://oskar-bordeaux.fr/handle/20.500.12278/199771 https://hdl.handle.net/20.500.12278/199771 https://doi.org/10.1007/s41063-018-0062-y EN eng 2364-9453 https://oskar-bordeaux.fr/handle/20.500.12278/199771 doi:10.1007/s41063-018-0062-y open Pas de Licence CC Living benthic foraminifera Chukchi Sea Water masses Primary production Sea-ice Planète et Univers [physics] Planète et Univers [physics]/Océan Atmosphère Planète et Univers [physics]/Sciences de la Terre/Océanographie Sciences de l'environnement/Biodiversité et Ecologie Article de revue 2018 ftoskarbordeaux https://doi.org/20.500.12278/19977110.1007/s41063-018-0062-y 2024-05-19T23:40:39Z 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. Article in Journal/Newspaper Chukchi Chukchi Sea Sea ice OSKAR Bordeaux (Open Science Knowledge ARchive) Chukchi Sea Pacific arktos 4 1 1 15 |
institution |
Open Polar |
collection |
OSKAR Bordeaux (Open Science Knowledge ARchive) |
op_collection_id |
ftoskarbordeaux |
language |
English |
topic |
Living benthic foraminifera Chukchi Sea Water masses Primary production Sea-ice Planète et Univers [physics] Planète et Univers [physics]/Océan Atmosphère Planète et Univers [physics]/Sciences de la Terre/Océanographie Sciences de l'environnement/Biodiversité et Ecologie |
spellingShingle |
Living benthic foraminifera Chukchi Sea Water masses Primary production Sea-ice Planète et Univers [physics] Planète et Univers [physics]/Océan Atmosphère Planète et Univers [physics]/Sciences de la Terre/Océanographie Sciences de l'environnement/Biodiversité et Ecologie RACINE, Calypso BONNIN, Jerome NAM, Seung-Il GIRAUDEAU, Jacques BIGUENET, Maude DESSANDIER, Pierre-Antoine KIM, Jung-Hyun Distribution of living benthic foraminifera in the northern Chukchi Sea |
topic_facet |
Living benthic foraminifera Chukchi Sea Water masses Primary production Sea-ice Planète et Univers [physics] Planète et Univers [physics]/Océan Atmosphère Planète et Univers [physics]/Sciences de la Terre/Océanographie Sciences de l'environnement/Biodiversité et Ecologie |
description |
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. |
format |
Article in Journal/Newspaper |
author |
RACINE, Calypso BONNIN, Jerome NAM, Seung-Il GIRAUDEAU, Jacques BIGUENET, Maude DESSANDIER, Pierre-Antoine KIM, Jung-Hyun |
author_facet |
RACINE, Calypso BONNIN, Jerome NAM, Seung-Il GIRAUDEAU, Jacques BIGUENET, Maude DESSANDIER, Pierre-Antoine KIM, Jung-Hyun |
author_sort |
RACINE, Calypso |
title |
Distribution of living benthic foraminifera in the northern Chukchi Sea |
title_short |
Distribution of living benthic foraminifera in the northern Chukchi Sea |
title_full |
Distribution of living benthic foraminifera in the northern Chukchi Sea |
title_fullStr |
Distribution of living benthic foraminifera in the northern Chukchi Sea |
title_full_unstemmed |
Distribution of living benthic foraminifera in the northern Chukchi Sea |
title_sort |
distribution of living benthic foraminifera in the northern chukchi sea |
publishDate |
2018 |
url |
https://oskar-bordeaux.fr/handle/20.500.12278/199771 https://hdl.handle.net/20.500.12278/199771 https://doi.org/10.1007/s41063-018-0062-y |
geographic |
Chukchi Sea Pacific |
geographic_facet |
Chukchi Sea Pacific |
genre |
Chukchi Chukchi Sea Sea ice |
genre_facet |
Chukchi Chukchi Sea Sea ice |
op_relation |
2364-9453 https://oskar-bordeaux.fr/handle/20.500.12278/199771 doi:10.1007/s41063-018-0062-y |
op_rights |
open Pas de Licence CC |
op_doi |
https://doi.org/20.500.12278/19977110.1007/s41063-018-0062-y |
container_title |
arktos |
container_volume |
4 |
container_issue |
1 |
container_start_page |
1 |
op_container_end_page |
15 |
_version_ |
1802006127427190784 |