Service interruption on Monday 11 July from 12:30 to 13:00: all the sites of the CCSD (HAL, EpiSciences, SciencesConf, AureHAL) will be inaccessible (network hardware connection).
Skip to Main content Skip to Navigation
Journal articles

Live benthic foraminiferal faunas from the Bay of Biscay: faunal density, composition, and microhabitats

Abstract : In the meso-oligotrophic Bay of Biscay, a diminishing downward organic matter flux with depth is accompanied by an important decrease of the live foraminiferal density. Although bottom water oxygenation is not directly influenced by organic matter input, the oxygenation of interstitial waters and the primary redox fronts do change in response to variations of the organic matter flux. The occurrence of deep and intermediate infaunal taxa can be linked to fundamental redox fronts and putative associated bacterial consortia. Our data are in agreement with the TROX-model, which explains the benthic foraminiferal microhabitat as a function of organic flux and benthic ecosystem oxygenation. Both the depth of the principle redox fronts and the microhabitat of deep infaunal species show important increases with depth. At the deepest oligotrophic stations, deep infaunal faunas become relatively poor. Therefore, the exported flux of organic matter appears to be the main parameter controlling the composition and the vertical distribution of benthic foraminiferal faunas below the sediment-water interface. The oxygenation of pore waters plays only a minor role. A species-level adaptation of the TROX-model is presented for the Bay of Biscay.
Document type :
Journal articles
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03618999
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Thursday, March 24, 2022 - 5:03:40 PM
Last modification on : Friday, March 25, 2022 - 3:57:31 AM

Links full text

Identifiers

Collections

INSU | EPHE | CNRS | PSL

Citation

C. Fontanier, F. J. Jorissen, L. Licari, A. Alexandre, P. Anschutz, et al.. Live benthic foraminiferal faunas from the Bay of Biscay: faunal density, composition, and microhabitats. Deep Sea Research Part I: Oceanographic Research Papers, 2002, 49, pp.751-785. ⟨10.1016/S0967-0637(01)00078-4⟩. ⟨insu-03618999⟩

Share

Metrics

Record views

5