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  • *Ecosystem  (2)
  • American Association for the Advancement of Science (AAAS)  (2)
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  • American Association for the Advancement of Science (AAAS)  (2)
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  • 1
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    Cenozoic plant diversity in the neotropics (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-04-01
    Description: Several mechanisms have been proposed to explain the high levels of plant diversity in the Neotropics today, but little is known about diversification patterns of Neotropical floras through geological time. Here, we present the longest time series compiled for palynological plant diversity of the Neotropics (15 stratigraphic sections, 1530 samples, 1411 morphospecies, and 287,736 occurrences) from the Paleocene to the early Miocene (65 to 20 million years ago) in central Colombia and western Venezuela. The record shows a low-diversity Paleocene flora, a significantly more diverse early to middle Eocene flora exceeding Holocene levels, and a decline in diversity at the end of the Eocene and early Oligocene. A good correlation between diversity fluctuations and changes in global temperature was found, suggesting that tropical climate change may be directly driving the observed diversity pattern. Alternatively, the good correspondence may result from the control that climate exerts on the area available for tropical plants to grow.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jaramillo, Carlos -- Rueda, Milton J -- Mora, German -- New York, N.Y. -- Science. 2006 Mar 31;311(5769):1893-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Tropical Paleoecology and Archeology, Smithsonian Tropical Research Institute, Unit 0948, Army Post Office AA 34002-0948, USA. jaramilloc@si.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16574860" target="_blank"〉PubMed〈/a〉
    Keywords: *Biodiversity ; Colombia ; *Ecosystem ; Geologic Sediments ; History, Ancient ; Plant Development ; *Plants ; *Pollen ; *Spores ; Temperature ; Time ; *Tropical Climate
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Effects of rapid global warming at the Paleocene-Eocene boundary on neotropical vegetation (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-11-13
    Description: Temperatures in tropical regions are estimated to have increased by 3 degrees to 5 degrees C, compared with Late Paleocene values, during the Paleocene-Eocene Thermal Maximum (PETM, 56.3 million years ago) event. We investigated the tropical forest response to this rapid warming by evaluating the palynological record of three stratigraphic sections in eastern Colombia and western Venezuela. We observed a rapid and distinct increase in plant diversity and origination rates, with a set of new taxa, mostly angiosperms, added to the existing stock of low-diversity Paleocene flora. There is no evidence for enhanced aridity in the northern Neotropics. The tropical rainforest was able to persist under elevated temperatures and high levels of atmospheric carbon dioxide, in contrast to speculations that tropical ecosystems were severely compromised by heat stress.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jaramillo, Carlos -- Ochoa, Diana -- Contreras, Lineth -- Pagani, Mark -- Carvajal-Ortiz, Humberto -- Pratt, Lisa M -- Krishnan, Srinath -- Cardona, Agustin -- Romero, Millerlandy -- Quiroz, Luis -- Rodriguez, Guillermo -- Rueda, Milton J -- de la Parra, Felipe -- Moron, Sara -- Green, Walton -- Bayona, German -- Montes, Camilo -- Quintero, Oscar -- Ramirez, Rafael -- Mora, German -- Schouten, Stefan -- Bermudez, Hermann -- Navarrete, Rosa -- Parra, Francisco -- Alvaran, Mauricio -- Osorno, Jose -- Crowley, James L -- Valencia, Victor -- Vervoort, Jeff -- New York, N.Y. -- Science. 2010 Nov 12;330(6006):957-61. doi: 10.1126/science.1193833.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Smithsonian Tropical Research Institute, Box 0843-03092, Balboa, Ancon, Republic of Panama. jaramilloc@si.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21071667" target="_blank"〉PubMed〈/a〉
    Keywords: Angiosperms ; Atmosphere ; Biodiversity ; Carbon Dioxide ; Colombia ; *Ecosystem ; Extinction, Biological ; *Global Warming ; *Plants ; Pollen ; Spores ; Temperature ; Time ; *Trees ; *Tropical Climate ; Venezuela
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
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