Flat latitudinal gradient in Paleocene mammal richness suggests decoupling of climate and biodiversity

被引：41

作者：

Rose, Peter J. ^{[1
]}

Fox, David L. ^{[1
]}

Marcot, Jonathan ^{[2
]}

Badgley, Catherine ^{[3
]}

机构：

[1] Univ Minnesota, Dept Earth Sci, Minneapolis, MN 55455 USA

[2] Univ Illinois, Sch Integrat Biol, Urbana, IL 61801 USA

[3] Univ Michigan, Museum Paleontol, Dept Ecol & Evolut Biol, Ann Arbor, MI 48109 USA

来源：

GEOLOGY | 2011年 / 39卷 / 02期

关键词：

NORTH-AMERICAN MAMMALS; OXYGEN-ISOTOPE; SPECIES DENSITY; DIVERSITY; TEMPERATURES; DELTA-O-18; SPECIATION; PATTERNS; BIGHORN; SCALE;

D O I：

10.1130/G31099.1

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

Mammal faunas from western North America exhibit no significant change in species richness with latitude during the Torrejonian (ca. 63-60 Ma) and Tiffanian (ca. 60-58 Ma) North American Land Mammal Ages, in contrast to a strong richness gradient in modern mammalian faunas of the same region today. The latitudinal gradient in oxygen isotope composition of mammalian bioapatite from the Paleocene faunas is similar to that of modern meteoric and surface waters, suggesting that the temperature gradient in the Paleocene was similar to the modern one. The flat richness gradient in the middle Paleocene indicates either different responses to climatic gradients of faunas dominated by extinct clades of placental mammals or distinct ecological processes during the Paleocene diversification of mammals following the end-Cretaceous mass extinction.

引用

页码：163 / 166

页数：4

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