期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 111, 期 39, 页码 14066-14070出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1324002111
关键词
climate modeling; paleogeography
资金
- Agence Nationale pour la Recherche (ANR) as part of PhyloSpace Project [ANR 2009 PEXT 002]
- Labex Centre d'Etudes de la Biodiversite Amazonienne [ANR-10-LABX-2501]
In 1879, Charles Darwin characterized the sudden and unexplained rise of angiosperms during the Cretaceous as an abominable mystery. The diversification of this clade marked the beginning of a rapid transition among Mesozoic ecosystems and floras formerly dominated by ferns, conifers, and cycads. Although the role of environmental factors has been suggested [Coiffard C, Gomez B (2012) Geol Acta 10(2): 181-188], Cretaceous global climate change has barely been considered as a contributor to angiosperm radiation, and focus was put on biotic factors to explain this transition. Here we use a fully coupled climate model driven by Mesozoic paleogeographic maps to quantify and discuss the impact of continental drift on angiosperm expansion and diversification. We show that the decrease of desertic belts between the Triassic and the Cretaceous and the subsequent onset of long-lasting humid conditions during the Late Cretaceous were driven by the breakup of Pangea and were contemporaneous with the first rise of angiosperm diversification. Positioning angiosperm-bearing fossil sites on our paleobioclimatic maps shows a strong match between the location of fossilrich outcrops and temperate humid zones, indicating that climate change from arid to temperate dominance may have set the stage for the ecological expansion of flowering plants.
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