Nannoplankton origination events and environmental changes in the late Paleocene and early Eocene

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doi: 10.1016/j.marmicro.2012.03.003
Author(s): Kalb, Andrea L.; Bralower, Timothy J.
Author Affiliation(s): Primary:
Pennsylvania State University, Department of Geosciences, University Park, PA, United States
Volume Title: Marine Micropaleontology
Source: Marine Micropaleontology, Vol.92-93, p.1-15. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0377-8398 CODEN: MAMIDH
Note: In English. 85 refs.; illus., incl. 1 table
Summary: The origination of six nannoplankton species in the late Paleocene to middle Eocene involves significant change in the entire nannofossil assemblage. The change began at the first occurrence and accelerates at the increase in abundance of the new species. The changes in the environment generally reflect the preferred ecology of the originating species. The species that originated in the late Paleocene to early Eocene (outside of the Paleocene-Eocene thermal maximum (PETM)) are generally thought to be oligotrophic taxa adapted to warm water conditions. During this long interval, temperatures were generally increasing and nutrient availability was decreasing; conditions that would have been advantageous for the originating taxa. Conversely, the species that originated in the middle Eocene are generally thought to be mesotrophs adapted to colder water conditions. These taxa were selected for during a time of generally increasing nutrient availability and decreasing temperature. Orbital stratigraphy indicates that the first occurrences of three Paleocene taxa are time transgressive by up to 400kyr. The only event that appears to be synchronous is the abundance increase of Zygrhablithus bijugatus during the PETM. This species is thought to be mesotrophic and replaces the genus Fasciculithus at a time when nutrient availability was likely increasing rapidly. Abstract Copyright (2012) Elsevier, B.V.
Year of Publication: 2012
Research Program: ODP Ocean Drilling Program
Key Words: 09 Paleontology, Paleobotany; Algae; Atlantic Ocean; Biologic evolution; Cenozoic; Chiasmolithus; Correspondence analysis; Discoaster multiradiatus; Discoasteridae; Eocene; Heliolithus kleinpellii; Leg 113; Leg 198; Leg 208; Lower Eocene; Maud Rise; Microfossils; Nannofossils; Nannoplankton; North Pacific; Northwest Pacific; ODP Site 1209; ODP Site 1210; ODP Site 1262; ODP Site 1263; ODP Site 690; Ocean Drilling Program; Pacific Ocean; Paleocene; Paleoclimatology; Paleoecology; Paleogene; Plankton; Plantae; Shatsky Rise; South Atlantic; Southern Ocean; Speciation; Sphenolithus; Sphenolithus radians; Statistical analysis; Tertiary; Upper Paleocene; Walvis Ridge; Weddell Sea; West Pacific; Zygrhablithus bijugatus
Coordinates: N321300 N324000 E1583100 E1581600
S283200 S271100 E0024700 E0013400
S650938 S650937 E0011218 E0011218
Record ID: 2018018876
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands