Living (stained) deep-sea Foraminifera off Hachinohe (NE Japan, Western Pacific): environmental interplay in oxygen-depleted ecosystems
In: ISSN: 0096-1191 ; Journal of Foraminiferal Research ; https://univ-perp.hal.science/hal-01267611 ; Journal of Foraminiferal Research, 2014, 44 (3), 2014
academicJournal
Zugriff:
International audience ; Live (Rose-Bengal stained) deep-sea foraminiferal faunas have been studied at five stations between 500–2000-m depth along the NE Japanese margin (western Pacific) to understand how complex environmental conditions (e.g., oxygen depletion, organic matter) control their structure (i.e., diversity, standing stocks, and microhabitats). All stations are characterized by silty sediments with no evidence of recent physical disturbances. The three stations located between 760–1250 m are bathed by dysoxic bottom waters (<45 μmol/L). Although high organic-carbon contents are recorded at all stations (>2.2% DW), only the oxygen-depleted sites are characterized by higher concentrations of sugars, lipids, and enzymatically hydrolysable amino acids (EHAA). Sedimentary contents in chlorophyllic pigments decrease with water depth without any major change in their freshness (i.e., [Chl a/(Chl a + Pheo a)] ratios). Both Uvigerina akitaensis and Bolivina spissa are restricted to the stations bathed by dysoxic waters, proving their oxygen-depletion tolerance. In such conditions, both phytophagous taxa are obviously able to take advantage of labile organic compounds (e.g., lipids and EHAA) contained in phytodetritus. Nonionella stella and Rutherfordoides cornuta survive in oxygen-depleted environments probably via alternative metabolic pathways (e.g., denitrification ability) and a large flexibility in trophic requirements. At stations where oxygen availability is higher (i.e., >70 μmol/L in bottom water) and where bioavailable organic compounds are slightly less abundant, diversity indices remain low, and more competitive species (e.g., Uvigerina curticosta, U. cf. U. graciliformis, Nonionella globosa, Nonionellina labradorica, and Elphidium batialis) are dominant.
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Living (stained) deep-sea Foraminifera off Hachinohe (NE Japan, Western Pacific): environmental interplay in oxygen-depleted ecosystems
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Autor/in / Beteiligte Person: | Fontanier, Christophe ; Duros, Pauline ; Toyofuku, Takashi ; Oguri, Kazumasa ; Koho, Karoliina Annika ; Buscail, Roselyne ; Grémare, Antoine ; Radakovitch, Olivier ; Deflandre, Bruno ; Nooijer, Lennart Jan De ; Bichon, Sabrina ; Goubet, Sarah ; Ivanovsky, Anastasia ; Chabaud, Gérard ; Menniti, Christophe ; Reichart, Gert-Jan ; Kitazato, Hiroshi ; Géosciences Marines (GM) ; Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) ; Laboratoire Environnements Sédimentaires (LES) ; Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) ; Environnements et Paléoenvironnements OCéaniques (EPOC) ; Observatoire aquitain des sciences de l'univers (OASU) ; Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE) ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) ; Japan Agency for Marine-Earth Science and Technology (JAMSTEC) ; Department of Earth Sciences - Geochemistry Utrecht ; Universiteit Utrecht / Utrecht University Utrecht ; Centre de Formation et de Recherche sur les Environnements Méditérranéens (CEFREM) ; Université de Perpignan Via Domitia (UPVD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) ; Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) ; Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) ; Royal Netherlands Institute for Sea Research (NIOZ) |
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Zeitschrift: | ISSN: 0096-1191 ; Journal of Foraminiferal Research ; https://univ-perp.hal.science/hal-01267611 ; Journal of Foraminiferal Research, 2014, 44 (3), 2014 |
Veröffentlichung: | HAL CCSD ; Cushman Foundation for Foraminiferal Research, 2014 |
Medientyp: | academicJournal |
DOI: | 10.2113/gsjfr.44.3.281 |
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