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  • Temperature  (19)
  • American Association for the Advancement of Science (AAAS)  (19)
  • American Meteorological Society
  • 2015-2019
  • 2010-2014  (19)
  • 1955-1959
  • 2010  (19)
Collection
Keywords
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Years
  • 2015-2019
  • 2010-2014  (19)
  • 1955-1959
Year
  • 1
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    The origins of C4 grasslands: integrating evolutionary and ecosystem science (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-05-01
    Description: The evolution of grasses using C4 photosynthesis and their sudden rise to ecological dominance 3 to 8 million years ago is among the most dramatic examples of biome assembly in the geological record. A growing body of work suggests that the patterns and drivers of C4 grassland expansion were considerably more complex than originally assumed. Previous research has benefited substantially from dialog between geologists and ecologists, but current research must now integrate fully with phylogenetics. A synthesis of grass evolutionary biology with grassland ecosystem science will further our knowledge of the evolution of traits that promote dominance in grassland systems and will provide a new context in which to evaluate the relative importance of C4 photosynthesis in transforming ecosystems across large regions of Earth.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Edwards, Erika J -- Osborne, Colin P -- Stromberg, Caroline A E -- Smith, Stephen A -- C4 Grasses Consortium -- Bond, William J -- Christin, Pascal-Antoine -- Cousins, Asaph B -- Duvall, Melvin R -- Fox, David L -- Freckleton, Robert P -- Ghannoum, Oula -- Hartwell, James -- Huang, Yongsong -- Janis, Christine M -- Keeley, Jon E -- Kellogg, Elizabeth A -- Knapp, Alan K -- Leakey, Andrew D B -- Nelson, David M -- Saarela, Jeffery M -- Sage, Rowan F -- Sala, Osvaldo E -- Salamin, Nicolas -- Still, Christopher J -- Tipple, Brett -- New York, N.Y. -- Science. 2010 Apr 30;328(5978):587-91. doi: 10.1126/science.1177216.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Ecology and Evolutionary Biology, Brown University, Providence, RI 02912, USA. erika_edwards@brown.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20431008" target="_blank"〉PubMed〈/a〉
    Keywords: *Biological Evolution ; Carbon Dioxide/metabolism ; Climate ; *Ecosystem ; Fossils ; Genetic Speciation ; Geography ; *Photosynthesis ; Phylogeny ; *Poaceae/classification/genetics/growth & development/metabolism ; Temperature ; Trees
    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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    The evolution of maximum body size of terrestrial mammals (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-11-27
    Description: The extinction of dinosaurs at the Cretaceous/Paleogene (K/Pg) boundary was the seminal event that opened the door for the subsequent diversification of terrestrial mammals. Our compilation of maximum body size at the ordinal level by sub-epoch shows a near-exponential increase after the K/Pg. On each continent, the maximum size of mammals leveled off after 40 million years ago and thereafter remained approximately constant. There was remarkable congruence in the rate, trajectory, and upper limit across continents, orders, and trophic guilds, despite differences in geological and climatic history, turnover of lineages, and ecological variation. Our analysis suggests that although the primary driver for the evolution of giant mammals was diversification to fill ecological niches, environmental temperature and land area may have ultimately constrained the maximum size achieved.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Smith, Felisa A -- Boyer, Alison G -- Brown, James H -- Costa, Daniel P -- Dayan, Tamar -- Ernest, S K Morgan -- Evans, Alistair R -- Fortelius, Mikael -- Gittleman, John L -- Hamilton, Marcus J -- Harding, Larisa E -- Lintulaakso, Kari -- Lyons, S Kathleen -- McCain, Christy -- Okie, Jordan G -- Saarinen, Juha J -- Sibly, Richard M -- Stephens, Patrick R -- Theodor, Jessica -- Uhen, Mark D -- New York, N.Y. -- Science. 2010 Nov 26;330(6008):1216-9. doi: 10.1126/science.1194830.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, MSC03 2020, University of New Mexico, Albuquerque, NM 87131, USA. fasmith@unm.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21109666" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Atmosphere ; *Biological Evolution ; *Body Size ; Ecosystem ; Environment ; Extinction, Biological ; Fossils ; Geography ; Mammals/*anatomy & histology/classification/growth & development ; Models, Biological ; Oxygen ; Phylogeny ; Temperature
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
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    Identification of carbonate-rich outcrops on Mars by the Spirit rover (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-06-05
    Description: Decades of speculation about a warmer, wetter Mars climate in the planet's first billion years postulate a denser CO2-rich atmosphere than at present. Such an atmosphere should have led to the formation of outcrops rich in carbonate minerals, for which evidence has been sparse. Using the Mars Exploration Rover Spirit, we have now identified outcrops rich in magnesium-iron carbonate (16 to 34 weight percent) in the Columbia Hills of Gusev crater. Its composition approximates the average composition of the carbonate globules in martian meteorite ALH 84001. The Gusev carbonate probably precipitated from carbonate-bearing solutions under hydrothermal conditions at near-neutral pH in association with volcanic activity during the Noachian era.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Morris, Richard V -- Ruff, Steven W -- Gellert, Ralf -- Ming, Douglas W -- Arvidson, Raymond E -- Clark, Benton C -- Golden, D C -- Siebach, Kirsten -- Klingelhofer, Gostar -- Schroder, Christian -- Fleischer, Iris -- Yen, Albert S -- Squyres, Steven W -- New York, N.Y. -- Science. 2010 Jul 23;329(5990):421-4. doi: 10.1126/science.1189667. Epub 2010 Jun 3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉NASA Johnson Space Center, Houston, TX 77058, USA. richard.v.morris@nasa.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20522738" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere ; Carbon Dioxide ; *Carbonates/chemistry ; Climate ; Extraterrestrial Environment ; Ferrous Compounds ; Magnesium ; *Mars ; Meteoroids ; Spacecraft ; Temperature ; *Water
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
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    Stable isotope measurements of martian atmospheric CO2 at the Phoenix landing site (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-09-11
    Description: Carbon dioxide is a primary component of the martian atmosphere and reacts readily with water and silicate rocks. Thus, the stable isotopic composition of CO2 can reveal much about the history of volatiles on the planet. The Mars Phoenix spacecraft measurements of carbon isotopes [referenced to the Vienna Pee Dee belemnite (VPDB)] [delta13C(VPDB) = -2.5 +/- 4.3 per mil (per thousand)] and oxygen isotopes [referenced to the Vienna standard mean ocean water (VSMOW)] (delta18O(VSMOW) = 31.0 +/- 5.7 per thousand), reported here, indicate that CO2 is heavily influenced by modern volcanic degassing and equilibration with liquid water. When combined with data from the martian meteorites, a general model can be constructed that constrains the history of water, volcanism, atmospheric evolution, and weathering on Mars. This suggests that low-temperature water-rock interaction has been dominant throughout martian history, carbonate formation is active and ongoing, and recent volcanic degassing has played a substantial role in the composition of the modern atmosphere.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Niles, Paul B -- Boynton, William V -- Hoffman, John H -- Ming, Douglas W -- Hamara, Dave -- New York, N.Y. -- Science. 2010 Sep 10;329(5997):1334-7. doi: 10.1126/science.1192863.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Astromaterials Research and Exploration Science, NASA Johnson Space Center, Houston, TX 77058, USA. paul.b.niles@nasa.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20829484" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere ; Carbon Dioxide/*analysis ; Carbon Isotopes/analysis ; Carbonates ; Evolution, Planetary ; Extraterrestrial Environment ; *Mars ; Meteoroids ; Oxygen Isotopes/analysis ; Spacecraft ; Temperature ; Time ; Volcanic Eruptions ; Water
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    Terrestrial gross carbon dioxide uptake: global distribution and covariation with climate (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-07-07
    Description: Terrestrial gross primary production (GPP) is the largest global CO(2) flux driving several ecosystem functions. We provide an observation-based estimate of this flux at 123 +/- 8 petagrams of carbon per year (Pg C year(-1)) using eddy covariance flux data and various diagnostic models. Tropical forests and savannahs account for 60%. GPP over 40% of the vegetated land is associated with precipitation. State-of-the-art process-oriented biosphere models used for climate predictions exhibit a large between-model variation of GPP's latitudinal patterns and show higher spatial correlations between GPP and precipitation, suggesting the existence of missing processes or feedback mechanisms which attenuate the vegetation response to climate. Our estimates of spatially distributed GPP and its covariation with climate can help improve coupled climate-carbon cycle process models.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Beer, Christian -- Reichstein, Markus -- Tomelleri, Enrico -- Ciais, Philippe -- Jung, Martin -- Carvalhais, Nuno -- Rodenbeck, Christian -- Arain, M Altaf -- Baldocchi, Dennis -- Bonan, Gordon B -- Bondeau, Alberte -- Cescatti, Alessandro -- Lasslop, Gitta -- Lindroth, Anders -- Lomas, Mark -- Luyssaert, Sebastiaan -- Margolis, Hank -- Oleson, Keith W -- Roupsard, Olivier -- Veenendaal, Elmar -- Viovy, Nicolas -- Williams, Christopher -- Woodward, F Ian -- Papale, Dario -- New York, N.Y. -- Science. 2010 Aug 13;329(5993):834-8. doi: 10.1126/science.1184984. Epub 2010 Jul 5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Biogeochemical Model-Data Integration Group, Max Planck Institute for Biogeochemistry, 07745 Jena, Germany. christian.beer@bgc-jena.mpg.de〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20603496" target="_blank"〉PubMed〈/a〉
    Keywords: Artificial Intelligence ; Atmosphere ; Carbon Dioxide/*metabolism ; *Climate ; Climatic Processes ; *Ecosystem ; Geography ; Models, Biological ; Models, Statistical ; Neural Networks (Computer) ; Oxygen Consumption ; *Photosynthesis ; Plant Leaves/*metabolism ; Plants/*metabolism ; Temperature ; Trees/metabolism ; Uncertainty ; Water
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
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    Erosion of lizard diversity by climate change and altered thermal niches (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-05-15
    Description: It is predicted that climate change will cause species extinctions and distributional shifts in coming decades, but data to validate these predictions are relatively scarce. Here, we compare recent and historical surveys for 48 Mexican lizard species at 200 sites. Since 1975, 12% of local populations have gone extinct. We verified physiological models of extinction risk with observed local extinctions and extended projections worldwide. Since 1975, we estimate that 4% of local populations have gone extinct worldwide, but by 2080 local extinctions are projected to reach 39% worldwide, and species extinctions may reach 20%. Global extinction projections were validated with local extinctions observed from 1975 to 2009 for regional biotas on four other continents, suggesting that lizards have already crossed a threshold for extinctions caused by climate change.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sinervo, Barry -- Mendez-de-la-Cruz, Fausto -- Miles, Donald B -- Heulin, Benoit -- Bastiaans, Elizabeth -- Villagran-Santa Cruz, Maricela -- Lara-Resendiz, Rafael -- Martinez-Mendez, Norberto -- Calderon-Espinosa, Martha Lucia -- Meza-Lazaro, Rubi Nelsi -- Gadsden, Hector -- Avila, Luciano Javier -- Morando, Mariana -- De la Riva, Ignacio J -- Victoriano Sepulveda, Pedro -- Rocha, Carlos Frederico Duarte -- Ibarguengoytia, Nora -- Aguilar Puntriano, Cesar -- Massot, Manuel -- Lepetz, Virginie -- Oksanen, Tuula A -- Chapple, David G -- Bauer, Aaron M -- Branch, William R -- Clobert, Jean -- Sites, Jack W Jr -- New York, N.Y. -- Science. 2010 May 14;328(5980):894-9. doi: 10.1126/science.1184695.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, CA 95064, USA. lizardrps@gmail.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20466932" target="_blank"〉PubMed〈/a〉
    Keywords: Acclimatization ; Animals ; *Biodiversity ; Biological Evolution ; Body Temperature ; *Climate Change ; *Ecosystem ; *Extinction, Biological ; Female ; Forecasting ; Geography ; Global Warming ; *Lizards/genetics/physiology ; Male ; Mexico ; Models, Biological ; Phylogeny ; Population Dynamics ; Reproduction ; Seasons ; Selection, Genetic ; Temperature
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
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    Comment on the paleoenvironment of Ardipithecus ramidus (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-05-29
    Description: White and colleagues (Research Articles, 2 October 2009, pp. 65-67 and www.sciencemag.org/ardipithecus) characterized the paleoenvironment of Ardipithecus ramidus at Aramis, Ethiopia, which they described as containing habitats ranging from woodland to forest patches. In contrast, we find the environmental context of Ar. ramidus at Aramis to be represented by what is commonly referred to as tree- or bush-savanna, with 25% or less woody canopy cover.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cerling, Thure E -- Levin, Naomi E -- Quade, Jay -- Wynn, Jonathan G -- Fox, David L -- Kingston, John D -- Klein, Richard G -- Brown, Francis H -- New York, N.Y. -- Science. 2010 May 28;328(5982):1105; author reply 1105. doi: 10.1126/science.1185274.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geology and Geophysics, University of Utah, Salt Lake City, UT 84112, USA. thure.cerling@utah.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20508112" target="_blank"〉PubMed〈/a〉
    Keywords: Africa ; Animals ; Biomass ; Carbon Isotopes ; Carbonates ; *Ecosystem ; *Environment ; Ethiopia ; Fossils ; Geography ; *Hominidae ; Mammals ; Oxygen Isotopes ; Plants ; Poaceae ; Temperature ; Trees
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    Contribution of semi-arid forests to the climate system (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-01-23
    Description: Forests both take up CO2 and enhance absorption of solar radiation, with contrasting effects on global temperature. Based on a 9-year study in the forests' dry timberline, we show that substantial carbon sequestration (cooling effect) is maintained in the large dry transition zone (precipitation from 200 to 600 millimeters) by shifts in peak photosynthetic activities from summer to early spring, and this is counteracted by longwave radiation (L) suppression (warming effect), doubling the forestation shortwave (S) albedo effect. Several decades of carbon accumulation are required to balance the twofold S + L effect. Desertification over the past several decades, however, contributed negative forcing at Earth's surface equivalent to approximately 20% of the global anthropogenic CO2 effect over the same period, moderating warming trends.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rotenberg, Eyal -- Yakir, Dan -- New York, N.Y. -- Science. 2010 Jan 22;327(5964):451-4. doi: 10.1126/science.1179998.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Environmental Sciences and Energy Research, Weizmann Institute of Science, Rehovot 76100, Israel.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20093470" target="_blank"〉PubMed〈/a〉
    Keywords: Carbon/*metabolism ; Carbon Dioxide/metabolism ; *Climatic Processes ; Conservation of Natural Resources ; *Ecosystem ; Geography ; Israel ; Photosynthesis ; Seasons ; Temperature ; *Trees/growth & development/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
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    Climate. Drylands in the Earth system (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-01-23
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schimel, David S -- New York, N.Y. -- Science. 2010 Jan 22;327(5964):418-9. doi: 10.1126/science.1184946.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉National Ecological Observatory, Inc., 5340 Airport Boulevard, Boulder, CO 80301, USA. dschimel@naeoninc.org〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20093461" target="_blank"〉PubMed〈/a〉
    Keywords: Carbon/*metabolism ; Climate Change ; *Climatic Processes ; Conservation of Natural Resources ; *Ecosystem ; Geography ; Israel ; Photosynthesis ; Seasons ; Temperature ; *Trees/growth & development/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    Plant science. Phenology under global warming (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-03-20
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Korner, Christian -- Basler, David -- New York, N.Y. -- Science. 2010 Mar 19;327(5972):1461-2. doi: 10.1126/science.1186473.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Botany, University of Basel, 4056 Basel, Switzerland. ch.koerner@unibas.ch〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20299580" target="_blank"〉PubMed〈/a〉
    Keywords: Flowers/growth & development ; *Global Warming ; Photoperiod ; Plant Leaves/growth & development ; *Plant Physiological Processes ; Seasons ; Temperature ; Trees/growth & development/*physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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