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Hantkeninid depth adaptation: an evolving life strategy in a changing ocean

Coxall, Helen Kathrine, Pearson, Paul Nicholas, Shackleton, Nicholas J. and Hall, Mike A. 2000. Hantkeninid depth adaptation: an evolving life strategy in a changing ocean. Geology 28 (1) , pp. 87-90. 10.1130/0091-7613(2000)28<87:HDAAEL>2.0.CO;2

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The interplay between evolution, paleoecology, and environmental change is examined in a geochemical study of a group of Eocene planktonic foraminifera. The hantkeninids, which are well-known biostratigraphic inde × fossils, underwent spectacular long-term evolution in the middle and upper Eocene (49.0–33.7 Ma), a time when major global climate and oceanic changes were occurring. We use oxygen and carbon isotope analysis of their shell calcite to investigate how their habitat changed as they evolved. The hantkeninids originated in a deep-water oxygen-minimum environment, but migrated into fully oxygenated near-surface waters as global temperatures decreased and water-column stratification declined. This change in depth ecology coincided with pronounced morphological evolution, involving changes in chamber shape and degree of inflation, and modification of the primary aperture. These developments are considered to be adaptations to a near-surface habitat.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Environmental Sciences
Subjects: G Geography. Anthropology. Recreation > GC Oceanography
G Geography. Anthropology. Recreation > GE Environmental Sciences
Q Science > QE Geology
Uncontrolled Keywords: planktonic; foraminifera; evolution; stable isotopes; Eocene; depth-ecology
Publisher: Geological Society of America
ISSN: 0091-7613
Last Modified: 04 Jun 2017 03:00

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