The Evolution of Maximum Body Size of Terrestrial Mammals

Author:

Smith Felisa A.1,Boyer Alison G.2,Brown James H.1,Costa Daniel P.3,Dayan Tamar4,Ernest S. K. Morgan5,Evans Alistair R.6,Fortelius Mikael7,Gittleman John L.8,Hamilton Marcus J.1,Harding Larisa E.9,Lintulaakso Kari7,Lyons S. Kathleen10,McCain Christy11,Okie Jordan G.1,Saarinen Juha J.7,Sibly Richard M.12,Stephens Patrick R.8,Theodor Jessica13,Uhen Mark D.13

Affiliation:

1. Department of Biology, MSC03 2020, University of New Mexico, Albuquerque, NM 87131, USA.

2. Department of Ecology and Evolutionary Biology, Yale University, Box 208106, New Haven, CT 06520, USA.

3. Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, Santa Cruz, CA 95064, USA.

4. Department of Zoology, Tel-Aviv University, Tel Aviv 69978, Israel.

5. Department of Biology and Ecology Center, Utah State University, Logan, UT 84322, USA.

6. School of Biological Sciences, Monash University, VIC 3800, Australia.

7. Department of Geosciences and Geography, Institute of Biotechnology, Post Office Box 64, FIN-00014 University of Helsinki, Finland.

8. Odum School of Ecology, 140 East Green Street, University of Georgia, Athens, GA 30602, USA.

9. Landscape Ecology, Tvistevägen 48, Department of Ecology and Environmental Science, Umea University, Umea, Sweden SE-90187.

10. Smithsonian Institution, Post Office Box 37012, MRC 121, Washington, DC 20013–7012, USA.

11. Department of Ecology and Evolutionary Biology, CU Natural History Museum, Campus Box 265, University of Colorado at Boulder, Boulder, CO 80309–0265, USA.

12. School of Biological Sciences, Harborne Building, University of Reading, Reading, UK.

13. Department of Biological Sciences, 2500 University Drive North West, University of Calgary, Calgary, Alberta T2N 1N4, Canada.

Abstract

How Mammals Grew in Size Mammals diversified greatly after the end-Cretaceous extinction, which eliminated the dominant land animals (dinosaurs). Smith et al. (p. 1216 ) examined how the maximum size of mammals increased during their radiation in each continent. Overall, mammal size increased rapidly, then leveled off after about 25 million years. This pattern holds true on most of the continents—even though data are sparse for South America—and implies that mammals grew to fill available niches before other environmental and biological limits took hold.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference31 articles.

1. Transformation and diversification in early mammal evolution;Luo Z.-X.;Nature,2007

2. A. W. Crompton in Comparative Physiology: Primitive Mammals K. Schmidt-Nielsen L. Bolis C. R. Taylor Eds. (Cambridge Univ. Press Cambridge 1980) pp. 1–12.

3. Large Mesozoic mammals fed on young dinosaurs;Hu Y.;Nature,2005

4. A Swimming Mammaliaform from the Middle Jurassic and Ecomorphological Diversification of Early Mammals

5. The fossil record of North American mammals: Evidence for a Paleocene evolutionary radiation;Alroy J.;Syst. Biol.,1999

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