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Mammal extinctions, body size, and paleotemperature

Proceedings of the National Academy of Sciences of the United States of America

By:
, , and
DOI: 10.1073/pnas.91.22.10403

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Abstract

There is a general inverse relationship between the natural logarithm of tooth area (a body size indicator) of some fossil mammals and paleotemperature during approximately 2.9 million years of the early Eocene in the Bighorn Basin of northwest Wyoming. When mean temperatures became warmer, tooth areas tended to become smaller. During colder times, larger species predominated; these generally became larger or remained the same size. Paleotemperature trends also markedly affected patterns of local (and, perhaps, regional) extinction and immigration. New species appeared as immigrants during or near the hottest (smaller forms) and coldest (larger forms) intervals. Paleotemperature trend reversals commonly resulted in the ultimate extinction of both small forms (during cooling intervals) and larger forms (during warming intervals). These immigrations and extinctions mark faunal turnovers that were also modulated by sharp increases in sediment accumulation rate.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Mammal extinctions, body size, and paleotemperature
Series title:
Proceedings of the National Academy of Sciences of the United States of America
DOI:
10.1073/pnas.91.22.10403
Volume
91
Issue:
22
Year Published:
1994
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Proceedings of the National Academy of Sciences of the United States of America
First page:
10403
Last page:
10406
Number of Pages:
4