Living (stained) deep-sea foraminifera from the Sea of Marmara: a preliminary study

Type Article
Date 2018-07
Language English
Author(s) Fontanier Christophe1, 2, 3, 4, Dissard D.5, Ruffine Livio6, Mamo B.7, Ponzevera Emmanuel6, Pelleter EwanORCID6, Baudin F.8, Roubi Angelique3, Cheron Sandrine6, Boissier AudreyORCID6, Gayet Nicolas9, Bermell-Fleury S.10, Pitel M.10, Guyader VivienORCID6, Lesongeur Francoise11, Savignac F.8
Affiliation(s) 1 : Univ Bordeaux, CNRS, Environm & Paleoenvironm Ocean & Continentaux, UMR 5805, F-33600 Pessac, France.
2 : FORAM, Foraminiferal Study Grp, F-49140 Villeveque, France.
3 : IFREMER, Lab Geodynam & Enregistrement Sedimentaire, Ctr Brest, Technopole Brest Iroise,BP 70, F-29280 Plouzane, France.
4 : Univ Angers, F-49035 Angers, France.
5 : Univ Paris 06, LOCEAN Lab, Sorbonne Univ, IRD,UPMC,CNRS,MNHN, 4 Pl Jussieu, F-75252 Paris 05, France.
6 : IFREMER, Lab Geochim & Metallogenie, Ctr Brest, Technopole Brest Iroise,BP 70, F-29280 Plouzane, France.
7 : Univ Hong Kong, Dept Biol Sci, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China.
8 : Univ Paris 06, Sorbonne Univ, Equipe Evolut & Modelisat Bassins Sedimentaire, UPMC,UMR 7193 ISTeP,Inst Sci Terre Paris, F-75252 Paris 05, France.
9 : IFREMER, Lab Environm Profonds, Ctr Brest, Technopole Brest Iroise,BP 70, F-29280 Plouzane, France.
10 : IFREMER, Serv Cartog Traitement Donnees & Instrument, Ctr Brest, Technopole Brest Iroise,BP 70, F-29280 Plouzane, France.
11 : IFREMER, Lab Microbiol Environm Extremes, Ctr Brest, Technopole Brest Iroise,BP 70, F-29280 Plouzane, France.
Source Deep-sea Research Part Ii-topical Studies In Oceanography (0967-0645) (Pergamon-elsevier Science Ltd), 2018-07 , Vol. 153 , P. 61-78
DOI 10.1016/j.dsr2.2017.12.011
WOS© Times Cited 2
Keyword(s) Living (stained) benthic foraminifera, Sea of Marmara, Extreme ecosystems, Trace elements, Stable isotopes
Abstract

In this preliminary study, we investigate living (stained) foraminifera from the Sea of Marmara. We focus on the faunal composition and geochemical signatures (trace elements, carbon and oxygen stable isotopes) in foraminiferal tests at two deep-sea sites (329 and ~1240 m depth respectively). Documented by ROV observations and sampling, both study areas are heterogeneous (including bacterial mats and carbonate concretions), proximal to cold seeps and consist of dysoxic bottom water (O2<20 µmol/L). The prevailing dysoxia at both study areas restricts foraminiferal diversity to very low values (S<9, H’<0.97). Stress-tolerant species Bolivina vadescens and Globobulimina affinis dominate living faunas at both sites. The highest foraminiferal standing stock is recorded at the shallowest site underneath a spreading bacterial mat. No benthic foraminifera from either site possess geochemical signatures of methane seepage. Our biogeochemical results show that use of foraminiferal Mn/Ca ratios as a proxy for bottom water oxygenation depends strongly on regional physiography, sedimentary processes and water column structure.

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Fontanier Christophe, Dissard D., Ruffine Livio, Mamo B., Ponzevera Emmanuel, Pelleter Ewan, Baudin F., Roubi Angelique, Cheron Sandrine, Boissier Audrey, Gayet Nicolas, Bermell-Fleury S., Pitel M., Guyader Vivien, Lesongeur Francoise, Savignac F. (2018). Living (stained) deep-sea foraminifera from the Sea of Marmara: a preliminary study. Deep-sea Research Part Ii-topical Studies In Oceanography, 153, 61-78. Publisher's official version : https://doi.org/10.1016/j.dsr2.2017.12.011 , Open Access version : https://archimer.ifremer.fr/doc/00416/52774/