6533b7d9fe1ef96bd126b8f9
RESEARCH PRODUCT
Distribution and ecology of the Globigerinoides ruber — Globigerinoides elongatus morphotypes in the Azores region during the late Pleistocene-Holocene
Antonio CarusoAnnachiara BartoliniFranck BassinotMarie-madeleine Blanc-valleronAlessandro Bonfardecisubject
[ SDU.OCEAN ] Sciences of the Universe [physics]/Ocean AtmospherePlanktonic foraminifera010506 paleontology010504 meteorology & atmospheric sciencesPleistoceneCyclostomaOceanography01 natural sciencesPaleontologyPaleoceanographyOcean gyre[ SDU.ENVI ] Sciences of the Universe [physics]/Continental interfaces environment14. Life underwaterGlacial periodPaleoclimatology[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environmentRelative species abundanceEcology Evolution Behavior and SystematicsHoloceneGlobigerinoidesComputingMilieux_MISCELLANEOUS0105 earth and related environmental sciencesEarth-Surface Processes[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmospheregeographygeography.geographical_feature_categorybiologyEcologyAzores front/current systemPaleontology15. Life on landbiology.organism_classificationStable isotopeEcology Evolution Behavior and SystematicOceanographyEarth-Surface ProcesseInterglacialSubtropical gyreGeologydescription
Abstract Globigerinoides ruber is the dominant taxon in the North Atlantic Subtropical Gyre, nowadays limited to the north by the Azores Current. It is highly sensitive to recent and late Pleistocene Azores Front Current System variability. In this study, we analyse the distribution of five individual morphotypes of the G. ruber – G. elongatus plexus (G. ruber s.s., G. ruber cyclostoma type, G. elongatus, G. elongatus cf.1, G. elongatus pyramidical type) and G. ruber kummerform gr. in a core (ATA13-OF-KT1) collected southwest of the Azores islands and located in a strategical position near the present-day boundary of the Subtropical Gyre/Azores Front Current System (STG/AFCS). Micropaleontological and stable isotope analyses can provide new insights on the ecological preferences of the G. ruber chromotypes and some selected morphotypes (especially the less studied G. ruber cyclostoma type). Their distribution pattern shows cyclic oscillations linked to climatic variability at orbital and millennial scales. G. elongatus clearly dominated the G. ruber - G. elongatus assemblage during the interglacials, while G. ruber cyclostoma type reached their maxima abundances during glacial periods. Furthermore, changes in the relative abundance of warm (G. elongatus) and cool water (G. ruber cyclostoma type) morphotypes represent a powerful tool to track the position occupied by the Subtropical Gyre/Azores Current (STG/AC) boundary during the last 74.7 kyr.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-02-01 |