High plant diversity in Eocene South America:: Evidence from Patagonia

被引：229
作者：
Wilf, P [1 ]
Cúneo, NR
Johnson, KR
Hicks, JF
Wing, SL
Obradovich, JD
机构：
[1] Penn State Univ, Dept Geosci, University Pk, PA 16802 USA
[2] Univ Michigan, Museum Paleontol, Ann Arbor, MI 48109 USA
[3] Univ Penn, Dept Earth & Environm Sci, Philadelphia, PA 19104 USA
[4] Museo Paleontol Egidio Feruglio, RA-9100 Trelew, Chubut, Argentina
[5] Denver Museum Nat & Sci, Dept Earth Sci, Denver, CO 80205 USA
[6] Smithsonian Inst, Dept Paleobiol, Washington, DC 20560 USA
[7] US Geol Survey, Lakewood, CO 80225 USA
来源：
SCIENCE | 2003年 / 300卷 / 5616期
关键词：
D O I：
10.1126/science.1080475
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Tropical South America has the highest plant diversity of any region today, but this richness is usually characterized as a geologically recent development (Neogene or Pleistocene). From caldera-lake beds exposed at Laguna del Hunco in Patagonia, Argentina, paleolatitude similar to47degreesS, we report 102 leaf species. Radioisotopic and paleomagnetic analyses indicate that the. ora was deposited 52 million years ago, the time of the early Eocene climatic optimum, when tropical plant taxa and warm, equable climates reached middle latitudes of both hemispheres. Adjusted for sample size, observed richness exceeds that of any other Eocene leaf. ora, supporting an ancient history of high plant diversity in warm areas of South America.
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页码：122 / 125
页数：4
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