Impact of the middle Miocene climate transition on elongate, cylindrical Foraminifera in the subtropical Pacific

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doi: 10.1016/j.marmicro.2010.09.008
Author(s): Johnson, Katherine; Hayward, Bruce W.; Holbourn, Ann
Author Affiliation(s): Primary:
Geomarine Research, Auckland, New Zealand
Christian Albrechts University, Germany
Volume Title: Marine Micropaleontology
Source: Marine Micropaleontology, 78(1-2), p.50-64. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0377-8398 CODEN: MAMIDH
Note: In English. Supplemental information/data is available in the online version of this article. 70 refs.; illus., incl. 3 tables, sketch map
Summary: Fifty-eight species of elongate, cylindrical benthic foraminifera (here referred to as the Extinction Group) belonging to genera that became extinct during the mid-Pleistocene Climate Transition (MPT), were documented (∼50kyr resolution) through the early middle Miocene (15-13Ma) in two sites on opposite sides of the subtropical Pacific Ocean (ODP Sites 1146, South China Sea; ODP Site 1237, southeast Pacific). The study was undertaken to investigate the response of the Extinction Group (Ext. Gp) to the major cooling during the middle Miocene Climate Transition (MCT) to look for clues that might explain the causes of the extinction during the glacials of the mid-Pleistocene Climate Transition. Ext. Gp faunal differences between the two sites (attributed to regional and bathymetric differences in food supply to the seafloor) are greater than those that occurred through the 2 myr time span at either site. The middle Miocene Climate Transition was not an interval of enhanced species turnover or a decline in Ext. Gp abundance, in contrast to the major extinctions that occurred during the mid-Pleistocene Climate Transition. Distinct changes in the composition of the Ext. Gp faunas did occur through this time (more pronounced in Site 1237). At both sites the pre-middle Miocene Climate Transition faunas were transformed into their post-middle Miocene Climate Transition composition during the period of major cooling (14.0-13.7Ma). During this transition interval the faunal composition swung back and forth between the two end member faunas. These faunal changes are attributed to changes in productivity (decrease in South China Sea, increase in southeast Pacific), brought about by major changes in global climate and continental aridity. Abstract Copyright (2011) Elsevier, B.V.
Year of Publication: 2011
Research Program: ODP Ocean Drilling Program
Key Words: 10 Paleontology, Invertebrate; Benthic taxa; Biodiversity; Cenozoic; Climate change; Deep-sea environment; East Pacific; Extinction; Faunal studies; Foraminifera; Invertebrata; Leg 184; Leg 202; Marine environment; Microfossils; Middle Miocene; Middle Pleistocene; Miocene; Nazca Ridge; Neogene; Nodosariacea; Nodosariidae; North Pacific; Northwest Pacific; ODP Site 1146; ODP Site 1237; Ocean Drilling Program; Pacific Ocean; Paleoclimatology; Paleoecology; Paleoenvironment; Pleistocene; Pleurostomellidae; Protista; Quaternary; Rotaliina; South China Sea; South Pacific; Southeast Pacific; Statistical analysis; Stilostomellidae; Tertiary; West Pacific
Coordinates: N192724 N192724 E1161622 E1161622
S160000 S160000 W0762300 W0762300
Record ID: 2011089352
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands