(Table DR1) Abundance of benthonic foraminifera in sediments from ODP Hole 113-690 ...

• Main Author: Thomas, Ellen
• Format: Dataset
• Language: English
• Published: PANGAEA 2003
• Subjects: Sample code/label; DEPTH, sediment/rock; AGE; Foraminifera, benthic; Number of species; Fishers alpha index of diversity; Abyssamina poagi; Abyssamina quadrata; Alabamina creta; Anomalinoides cf. acutus; Anomalinoides rubiginosus; Anomalinoides spissiformis; Aragonia aragonensis; Aragonia sp.; Astacolus spp.; Bolivinita sp.; Bolivinoides cf. decoratus; Bolivinoides decoratus; Bolivinoides delicatulus; Bulimina kugleri; Bulimina midwayensis; Bulimina simplex; Bulimina thanetensis; Bulimina trinitatensis; Buliminella beaumonti; Cibicides variabilis; Clinapertina subplanispira; Coryphostoma sp.; Cyclammina sp.; Dorothia oxycona; Eilohedra weddellensis; Fursenkoina pauciloculata; Fursenkoina tegulata; Gaudryina pyramidata; Globobulimina sp.; Gravellina narivaensis; Gyroidinoides acutus; Gyroidinoides depressus; Gyroidinoides girardana; Gyroidinoides globosus; Gyroidinoides beisseli; Gyroidinoides planulatus; Gyroidinoides soldanii; Gyroidinoides subquadratus; Heronallenia lingulata; Lenticulina macrodisca; Lenticulina spp.; Lingulina sp.; Loxostomum sp.; Marginulina spp.; Methane hydrate; Southern Ocean
• Online Access: https://dx.doi.org/10.1594/pangaea.724678; https://doi.pangaea.de/10.1594/PANGAEA.724678

A mass extinction of deep-sea benthic foraminifera has been documented globally, coeval with the negative carbon isotope excursion (CIE) at the Paleocene-Eocene boundary, which was probably caused by dissociation of methane hydrate. A detailed record of benthic foraminiferal faunal change over ~30 k.y. across the carbon isotopic excursion at the Ocean Drilling Program Site 690 (Southern Ocean) shows that shortly before the CIE absolute benthic foraminiferal abundance at that site started to increase. 'Doomed species' began to decrease in abundance at the CIE by a few thousand years. After the extinction faunas were dominated by small species, which resemble opportunistic taxa under high-productivity regions in the present oceans. Calcareous nannofossils (primary producers), however, show a transition to more oligotrophic nannofloras exactly where the benthic faunas show the opposite. Plankton and benthos is thus decoupled. Possibly, a larger fraction of food particles reached the seafloor after the CIE, so ... : Supplement to: Thomas, Ellen (2003): Extinction and food at the seafloor: A high-resolution benthic foraminiferal record across the initial Eocene thermal maximum, Southern Ocean site 690. GSA Special Paper: Causes and consequences of globally warm climates in the Early Paleogene, 319-332 ...