Ecological response to collapse of the biological pump following the mass extinction at the Cretaceous-Paleogene boundary

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doi: 10.5194/bg-14-885-2017
Author(s): Vellekoop, Johan; Woelders, Lineke; Acikalin, Sanem; Smit, Jan; van de Schootbrugge, Bas; Yilmaz, Ismail O.; Brinkhuis, Henk; Speijer, Robert P.
Author Affiliation(s): Primary:
Utrecht University, Laboratory of Palaeobotany and Palynology, Utrecht, Netherlands
Katholieke Universiteit Leuven, Belgium
Newcastle University, United Kingdom
Vrije Universiteit Amsterdam, Netherlands
Middle East Technical University, Turkey
Volume Title: Biogeosciences
Source: Biogeosciences, 14(4), p.885-900. Publisher: Copernicus GmbH on behalf of the European Union, Katlenburg-Lindau, International. ISSN: 1726-4170
Note: In English. 83 refs.; illus., incl. strat. cols., sketch map
Summary: It is commonly accepted that the mass extinction associated with the Cretaceous-Paleogene (K-Pg) boundary (66 Ma) is related to the environmental effects of a large extraterrestrial impact. The biological and oceanographic consequences of the mass extinction are, however, still poorly understood. According to the "Living Ocean" model, the biological crisis at the K-Pg boundary resulted in a long-term reduction of export productivity in the early Paleocene. Here, we combine organic-walled dinoflagellate cyst (dinocyst) and benthic foraminiferal analyses to provide new insights into changes in the coupling of pelagic and benthic ecosystems. To this end, we perform dinocyst and benthic foraminiferal analyses on the recently discovered Tethyan K-Pg boundary section at Okcular, Turkey, and compare the results with other K-Pg boundary sites in the Tethys. The post-impact dominance of epibenthic morphotypes and an increase of inferred heterotrophic dinocysts in the early Paleocene at Okcular are consistent with published records from other western Tethyan sites. Together, these records indicate that during the early Paleocene more nutrients remained available for the Tethyan planktonic community, whereas benthic communities were deprived of food. Hence, in the post-impact phase the reduction of export productivity likely resulted in enhanced recycling of nutrients in the upper part of the water column, all along the western Tethyan margins.
Year of Publication: 2017
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Asia; Atlantic Ocean; Benthic taxa; Blake Nose; Blake Plateau; Cenozoic; Communities; Cretaceous; Dinoflagellata; Ecosystems; Foraminifera; Global; Isotopes; K-Pg boundary; Leg 171B; Lower Paleocene; Marine environment; Mass extinctions; Mesozoic; Microfossils; Middle East; Miospores; North Atlantic; Nutrients; ODP Site 1049; Ocean Drilling Program; Okcular Turkey; Paleocene; Paleoecology; Paleogene; Palynomorphs; Pollen; Productivity; Species diversity; Stable isotopes; Statistical analysis; Stratigraphic boundary; Tertiary; Tethys; Turkey; Upper Cretaceous
Coordinates: N300832 N300832 W0760644 W0760644
Record ID: 2018100008
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Copernicus Gesellschaft, Katlenburg-Lindau, Germany