Response of nannoplankton to early Eocene ocean destratification

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doi: 10.1016/j.palaeo.2011.06.018
Author(s): Schneider, Leah J.; Bralower, Timothy J.; Kump, Lee R.
Author Affiliation(s): Primary:
Pennsylvania State University at University Park, University Park, PA, United States
Volume Title: Palaeogeography, Palaeoclimatology, Palaeoecology
Source: Palaeogeography, Palaeoclimatology, Palaeoecology, 310(3-4), p.152-162. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0031-0182 CODEN: PPPYAB
Note: In English. 76 refs.; illus., incl. sketch map
Summary: Nannoplankton play a significant role in the global carbon cycle; changes in the composition of the assemblage can influence primary productivity, carbon burial, and ultimately climate. Here counts of nannofossils in Eocene samples document one of the largest nannoplankton assemblage turnovers of the Cenozoic Era. This event is marked by the global expansion of Reticulofenestra at the termination of the early Eocene climatic optimum (EECO), and continues through the progressive cooling to the earliest Oligocene glaciation. To understand the mechanisms driving this assemblage shift we use multivariate statistical techniques and carbon and oxygen isotope records from localities worldwide. We find that the turnover in the global nannofossil assemblage is tied to thermal destratification of the ocean and a coincident decrease in the efficiency of the oceanic biologic pump at the height of the EECO. We propose that increased vertical mixing and increased nutrient supply to surface waters during the EECO caused a shift in the trophic structure towards enhanced productivity, influencing the global nannoplankton population. Abstract Copyright (2011) Elsevier, B.V.
Year of Publication: 2011
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Arctic environment; Assemblages; Atlantic Ocean; Biologic evolution; Biostratigraphy; C-13/C-12; Carbon; Carbon cycle; Cenozoic; DSDP Site 549; Deep Sea Drilling Project; Early Eocene Climatic Optimum; Eocene; Exmouth Plateau; Geochemical cycle; IPOD; Indian Ocean; Isotope ratios; Isotopes; Kerguelen Plateau; Leg 113; Leg 122; Leg 183; Leg 198; Leg 208; Leg 80; Lower Eocene; Maud Rise; Microfossils; Multivariate analysis; Nannofossils; Nannoplankton; North Atlantic; North Pacific; Northwest Pacific; O-18/O-16; ODP Site 1135; ODP Site 1137; ODP Site 1210; ODP Site 1263; ODP Site 689; ODP Site 690; ODP Site 762; Ocean Drilling Program; Oxygen; Pacific Ocean; Paleo-oceanography; Paleoecology; Paleogene; Plankton; Plantae; Reticulofenestra; Shatsky Rise; South Atlantic; Southern Ocean; Stable isotopes; Statistical analysis; Temperate environment; Tertiary; Trophic analysis; Tropical environment; Walvis Ridge; Weddell Sea; West Pacific
Coordinates: N321300 N321300 E1581600 E1581600
S195315 S195314 E1121515 E1121514
S565000 S565000 E0680536 E0680536
S643101 S643100 E0030600 E0030559
Record ID: 2017006491
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands