6533b82afe1ef96bd128b698
RESEARCH PRODUCT
L’élongation des loges chez les foraminifères planctoniques du Crétacé inférieur: une adaptation à la sous-oxygénation des eaux?
Françoise Magniez-janninsubject
Oxygen deficientbiologyLow oxygenGeochemistrychemistry.chemical_elementOcean Engineeringbiology.organism_classificationAnoxic watersOxygenCretaceousForaminiferaPaleontologychemistryEcology Evolution Behavior and SystematicsGeologydescription
Abstract Planktic foraminifera with radially elongated chambers appeared on four occasions in the early Cretaceous of the Vocontian Basin (SE France). These appearances coincided with or followed the deposition of organic rich levels which are evidence of hypoxic to anoxic conditions at the sea-floor. In addition, oxygen deficient surface waters are inferred from the occasional presence of Hedbergellas with deformed (insufficiently calcified) walls. It is suggested that the elongation of the chambers of these foraminifera was an adaptive response to the low oxygen content of surface waters, the increased surface area of the test allowing better gas exchange with sea water and the intake of sufficient quantities of oxygen for their metabolic needs.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1998-02-01 | Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science |