TY - JOUR
T1 - Benthic foraminiferal turnover across the Dan-C2 event in the eastern South Atlantic Ocean (ODP Site 1262)
AU - Arreguín-Rodríguez, Gabriela J.
AU - Barnet, James S.K.
AU - Leng, Melanie J.
AU - Littler, Kate
AU - Kroon, Dick
AU - Schmidt, Daniela
AU - Thomas, Ellen
AU - Alegret, Laia
N1 - G.J.A.R. and L.A. acknowledge funding from projects CGL2017-84693-R and PID2019-105537RB-I00 (Spanish Ministry of Science and Innovation and FEDER funds), and from Consolidated Group E05 (Government of Aragon/Fondo Europeo de Desarrollo Regional). E.T. recognises partial funding by NSF_OCE 1536611. G.J.A.R thanks the Consejo Nacional de Ciencia y Tecnología (Conacyt, México) for her predoctoral fellowship. J.S.K.B. and K.L. acknowledge funding from the Natural Environment Research Council (NERC) Isotope Geosciences Facility at the British Geological Survey (IP-1581–1115) and D.N.S. support from the Royal Society via Wolfson Merit award. This research used samples provided by the Ocean Drilling Program (ODP), sponsored by the U.S. National Science Foundation (NSF) and participating countries under management of Joint Oceanographic Institutions (JOI), Inc.
PY - 2021/6/15
Y1 - 2021/6/15
N2 - The Paleogene was punctuated by perturbations of the global carbon cycle,
many associated with transient global warming events (hyperthermals).
The Dan-C2 event (~160 kyr after Cretaceous/Paleogene boundary; K/Pg)
was the oldest of these eccentricity-linked carbon cycle disturbances
(ELCD). In contrast to other hyperthermals, the Dan-C2 event was not
characterised by bottom water warming, and surface water warming
probably was not global. Benthic foraminiferal assemblages across Dan-C2
at SE Atlantic Ocean Drilling Program
(ODP) Site 1262 are diverse and strongly dominated by calcareous
species. Epifaunal and infaunal morphogroups are equally abundant,
suggesting meso-oligotrophic seafloor conditions. Assemblages decreased
in diversity gradually before Dan-C2, and Nuttallides truempyi decreased in relative abundance while Stensioeina beccariiformis and the agglutinant Spiroplectammina spectabilis increased, suggesting enhanced food supply to the seafloor. Benthic foraminifera were not highly affected by the Dan-C2 event. An increase in relative abundance of the opportunistic species Bulimina kugleri and Seabrookia cretacea
after Dan-C2 points to a change in the type of organic matter arriving
at the seafloor. These changes may have been caused by ongoing
environmental and/or evolutionary instability following K/Pg mass extinction of oceanic plankton. Variability in composition of pelagic ecosystems,
thus the type and/or amount of food arriving at the seafloor, may have
been caused by the gradual recovery of pelagic ecosystems after that
extinction, possibly affected by warming and pH changes due to Deccan
volcanism.
AB - The Paleogene was punctuated by perturbations of the global carbon cycle,
many associated with transient global warming events (hyperthermals).
The Dan-C2 event (~160 kyr after Cretaceous/Paleogene boundary; K/Pg)
was the oldest of these eccentricity-linked carbon cycle disturbances
(ELCD). In contrast to other hyperthermals, the Dan-C2 event was not
characterised by bottom water warming, and surface water warming
probably was not global. Benthic foraminiferal assemblages across Dan-C2
at SE Atlantic Ocean Drilling Program
(ODP) Site 1262 are diverse and strongly dominated by calcareous
species. Epifaunal and infaunal morphogroups are equally abundant,
suggesting meso-oligotrophic seafloor conditions. Assemblages decreased
in diversity gradually before Dan-C2, and Nuttallides truempyi decreased in relative abundance while Stensioeina beccariiformis and the agglutinant Spiroplectammina spectabilis increased, suggesting enhanced food supply to the seafloor. Benthic foraminifera were not highly affected by the Dan-C2 event. An increase in relative abundance of the opportunistic species Bulimina kugleri and Seabrookia cretacea
after Dan-C2 points to a change in the type of organic matter arriving
at the seafloor. These changes may have been caused by ongoing
environmental and/or evolutionary instability following K/Pg mass extinction of oceanic plankton. Variability in composition of pelagic ecosystems,
thus the type and/or amount of food arriving at the seafloor, may have
been caused by the gradual recovery of pelagic ecosystems after that
extinction, possibly affected by warming and pH changes due to Deccan
volcanism.
KW - Warming
KW - Benthic foraminifera
KW - K/Pg extinction
KW - Plankton evolution
KW - Paleocene
KW - Paleogene
U2 - 10.1016/j.palaeo.2021.110410
DO - 10.1016/j.palaeo.2021.110410
M3 - Article
SN - 0031-0182
VL - 572
JO - Palaeogeography, Palaeoclimatology, Palaeoecology
JF - Palaeogeography, Palaeoclimatology, Palaeoecology
M1 - 110410
ER -