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  • 1
    Publication Date: 2010-11-06
    Description: The long-term warmth of the Eocene (~56 to 34 million years ago) is commonly associated with elevated partial pressure of atmospheric carbon dioxide (pCO(2)). However, a direct relationship between the two has not been established for short-term climate perturbations. We reconstructed changes in both pCO(2) and temperature over an episode of transient global warming called the Middle Eocene Climatic Optimum (MECO; ~40 million years ago). Organic molecular paleothermometry indicates a warming of southwest Pacific sea surface temperatures (SSTs) by 3 degrees to 6 degrees C. Reconstructions of pCO(2) indicate a concomitant increase by a factor of 2 to 3. The marked consistency between SST and pCO(2) trends during the MECO suggests that elevated pCO(2) played a major role in global warming during the MECO.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bijl, Peter K -- Houben, Alexander J P -- Schouten, Stefan -- Bohaty, Steven M -- Sluijs, Appy -- Reichart, Gert-Jan -- Sinninghe Damste, Jaap S -- Brinkhuis, Henk -- New York, N.Y. -- Science. 2010 Nov 5;330(6005):819-21. doi: 10.1126/science.1193654.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Biomarine Sciences, Institute of Environmental Biology, Faculty of Science, Laboratory of Palaeobotany and Palynology, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, Netherlands. p.k.bijl@uu.nl〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21051636" target="_blank"〉PubMed〈/a〉
    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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  • 2
    Publication Date: 2011-08-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hulme, Mike -- Mahony, Martin -- Beck, Silke -- Gorg, Christoph -- Hansjurgens, Bernd -- Hauck, Jennifer -- Nesshover, Carsten -- Paulsch, Axel -- Vandewalle, Marie -- Wittmer, Heidi -- Boschen, Stefan -- Bridgewater, Peter -- Diaw, Mariteuw Chimere -- Fabre, Pierre -- Figueroa, Aurelia -- Heong, Kong Luen -- Korn, Horst -- Leemans, Rik -- Lovbrand, Eva -- Hamid, Mohd Norowi -- Monfreda, Chad -- Pielke, Roger Jr -- Settele, Josef -- Winter, Marten -- Vadrot, Alice B M -- van den Hove, Sybille -- van der Sluijs, Jeroen P -- New York, N.Y. -- Science. 2011 Aug 5;333(6043):697-8. doi: 10.1126/science.333.6043.697.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21817033" target="_blank"〉PubMed〈/a〉
    Keywords: *Biodiversity ; *Ecosystem ; *Policy ; Policy Making
    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
    Publication Date: 2012-03-03
    Description: Ocean acidification may have severe consequences for marine ecosystems; however, assessing its future impact is difficult because laboratory experiments and field observations are limited by their reduced ecologic complexity and sample period, respectively. In contrast, the geological record contains long-term evidence for a variety of global environmental perturbations, including ocean acidification plus their associated biotic responses. We review events exhibiting evidence for elevated atmospheric CO(2), global warming, and ocean acidification over the past ~300 million years of Earth's history, some with contemporaneous extinction or evolutionary turnover among marine calcifiers. Although similarities exist, no past event perfectly parallels future projections in terms of disrupting the balance of ocean carbonate chemistry-a consequence of the unprecedented rapidity of CO(2) release currently taking place.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Honisch, Barbel -- Ridgwell, Andy -- Schmidt, Daniela N -- Thomas, Ellen -- Gibbs, Samantha J -- Sluijs, Appy -- Zeebe, Richard -- Kump, Lee -- Martindale, Rowan C -- Greene, Sarah E -- Kiessling, Wolfgang -- Ries, Justin -- Zachos, James C -- Royer, Dana L -- Barker, Stephen -- Marchitto, Thomas M Jr -- Moyer, Ryan -- Pelejero, Carles -- Ziveri, Patrizia -- Foster, Gavin L -- Williams, Branwen -- New York, N.Y. -- Science. 2012 Mar 2;335(6072):1058-63. doi: 10.1126/science.1208277.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, USA. hoenisch@ldeo.columbia.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22383840" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptation, Biological ; Animals ; *Aquatic Organisms ; Atmosphere ; Carbon Dioxide ; Carbonates/analysis ; *Ecosystem ; Extinction, Biological ; Forecasting ; Fossils ; *Geological Phenomena ; Hydrogen-Ion Concentration ; Oceans and Seas ; Seawater/*chemistry
    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
    Publication Date: 2014-11-02
    Description: Emerging infectious diseases are reducing biodiversity on a global scale. Recently, the emergence of the chytrid fungus Batrachochytrium salamandrivorans resulted in rapid declines in populations of European fire salamanders. Here, we screened more than 5000 amphibians from across four continents and combined experimental assessment of pathogenicity with phylogenetic methods to estimate the threat that this infection poses to amphibian diversity. Results show that B. salamandrivorans is restricted to, but highly pathogenic for, salamanders and newts (Urodela). The pathogen likely originated and remained in coexistence with a clade of salamander hosts for millions of years in Asia. As a result of globalization and lack of biosecurity, it has recently been introduced into naive European amphibian populations, where it is currently causing biodiversity loss.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Martel, A -- Blooi, M -- Adriaensen, C -- Van Rooij, P -- Beukema, W -- Fisher, M C -- Farrer, R A -- Schmidt, B R -- Tobler, U -- Goka, K -- Lips, K R -- Muletz, C -- Zamudio, K R -- Bosch, J -- Lotters, S -- Wombwell, E -- Garner, T W J -- Cunningham, A A -- Spitzen-van der Sluijs, A -- Salvidio, S -- Ducatelle, R -- Nishikawa, K -- Nguyen, T T -- Kolby, J E -- Van Bocxlaer, I -- Bossuyt, F -- Pasmans, F -- Wellcome Trust/United Kingdom -- New York, N.Y. -- Science. 2014 Oct 31;346(6209):630-1. doi: 10.1126/science.1258268.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, B-9820 Merelbeke, Belgium. an.martel@ugent.be. ; Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, B-9820 Merelbeke, Belgium. Centre for Research and Conservation, Royal Zoological Society of Antwerp, Koningin Astridplein 26, Antwerp, Belgium. ; Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, B-9820 Merelbeke, Belgium. ; CIBIO/InBIO, Centro de Investigacao em Biodiversidade e Recursos Geneticos da Universidade do Porto, Instituto de Ciencias Agrarias de Vairao, Rua Padre Armando Quintas, Vairao, Portugal. ; Department of Infectious Disease Epidemiology, Imperial College London, Norfolk Place, London W2 1PG, UK. ; Genome Sequencing and Analysis Program, The Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA. ; Koordinationsstelle fur amphibien- und reptilienschutz in der Schweiz (KARCH), Passage Maximilien-de-Meuron 6, 2000 Neuchatel, Switzerland. Institut fur Evolutionsbiologie und Umweltwissenschaften, Universitat Zurich. Winterthurerstrasse 190, 8057 Zurich, Switzerland. ; Invasive Alien Species Research Team, National Institute for Environment Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan. ; Department of Biology, University of Maryland, College Park, MD 20742, USA. ; Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY 14853, USA. ; Museo Nacional de Ciencias Naturales, Consejo Superior de Investigaciones cientificas (CSIC), Jose Gutierrez Abascal 2, 28006 Madrid, Spain. ; Biogeography Department, Trier University, 54286 Trier, Germany. ; Durrell Institute of Conservation and Ecology, University of Kent, Kent CT2 7NR, UK. Institute of Zoology, Zoological Society of London, London NW1 4RY, UK. ; Institute of Zoology, Zoological Society of London, London NW1 4RY, UK. ; Reptile, Amphibian and Fish Conservation the Netherlands (RAVON), Post Office Box 1413, 6501 BK Nijmegen, Netherlands. ; Department of Earth Science, Environmental and Life (Di.S.T.A.V.), University of Genova, Corso Europa 26, I-16132 Genova, Italy. ; Graduate School of Human and Environmental Studies, Kyoto University, Yoshida Nihonmatsu-cho, Sakyo-ku, Kyoto 606-8501, Japan. ; Vietnam National Museum of Nature, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam. ; James Cook University, One Health Research Group, School of Public Health, Tropical Medicine and Rehabilitation Sciences, Townsville, Queensland, Australia. ; Amphibian Evolution Lab, Biology Department, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25359973" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biodiversity ; *Chytridiomycota ; Communicable Diseases, Emerging/microbiology/*veterinary ; *Endangered Species ; Mycoses/microbiology/*veterinary ; Phylogeny ; Urodela/classification/*microbiology
    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
    Publication Date: 1998-01-31
    Description: The cerebral cortex of Alzheimer's and Down syndrome patients is characterized by the presence of protein deposits in neurofibrillary tangles, neuritic plaques, and neuropil threads. These structures were shown to contain forms of beta amyloid precursor protein and ubiquitin-B that are aberrant (+1 proteins) in the carboxyl terminus. The +1 proteins were not found in young control patients, whereas the presence of ubiquitin-B+1 in elderly control patients may indicate early stages of neurodegeneration. The two species of +1 proteins displayed cellular colocalization, suggesting a common origin, operating at the transcriptional level or by posttranscriptional editing of RNA. This type of transcript mutation is likely an important factor in the widely occurring nonfamilial early- and late-onset forms of Alzheimer's disease.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉van Leeuwen, F W -- de Kleijn, D P -- van den Hurk, H H -- Neubauer, A -- Sonnemans, M A -- Sluijs, J A -- Koycu, S -- Ramdjielal, R D -- Salehi, A -- Martens, G J -- Grosveld, F G -- Peter, J -- Burbach, H -- Hol, E M -- New York, N.Y. -- Science. 1998 Jan 9;279(5348):242-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Graduate School for Neurosciences Amsterdam, Netherlands Institute for Brain Research, 1105 AZ Amsterdam, The Netherlands. f.van.leeuwen@nih.knaw.nl〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9422699" target="_blank"〉PubMed〈/a〉
    Keywords: Aged ; Aging/genetics ; Alzheimer Disease/*genetics/metabolism/pathology ; Amino Acid Sequence ; Amyloid beta-Protein Precursor/analysis/chemistry/*genetics ; Base Sequence ; *Brain Chemistry ; Cerebral Cortex/chemistry/pathology ; Cloning, Molecular ; Down Syndrome/*genetics/metabolism/pathology ; Female ; *Frameshift Mutation ; Hippocampus/chemistry/pathology ; Humans ; Male ; Molecular Sequence Data ; Neurites/chemistry ; Neurofibrillary Tangles/chemistry ; Neuropil/chemistry ; Polymerase Chain Reaction ; RNA Editing ; Repetitive Sequences, Nucleic Acid ; Sequence Deletion ; Transcription, Genetic ; Ubiquitins/analysis/chemistry/*genetics/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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  • 6
    Publication Date: 2005-06-11
    Description: The Paleocene-Eocene thermal maximum (PETM) has been attributed to the rapid release of approximately 2000 x 10(9) metric tons of carbon in the form of methane. In theory, oxidation and ocean absorption of this carbon should have lowered deep-sea pH, thereby triggering a rapid (〈10,000-year) shoaling of the calcite compensation depth (CCD), followed by gradual recovery. Here we present geochemical data from five new South Atlantic deep-sea sections that constrain the timing and extent of massive sea-floor carbonate dissolution coincident with the PETM. The sections, from between 2.7 and 4.8 kilometers water depth, are marked by a prominent clay layer, the character of which indicates that the CCD shoaled rapidly (〈10,000 years) by more than 2 kilometers and recovered gradually (〉100,000 years). These findings indicate that a large mass of carbon (〉〉2000 x 10(9) metric tons of carbon) dissolved in the ocean at the Paleocene-Eocene boundary and that permanent sequestration of this carbon occurred through silicate weathering feedback.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zachos, James C -- Rohl, Ursula -- Schellenberg, Stephen A -- Sluijs, Appy -- Hodell, David A -- Kelly, Daniel C -- Thomas, Ellen -- Nicolo, Micah -- Raffi, Isabella -- Lourens, Lucas J -- McCarren, Heather -- Kroon, Dick -- New York, N.Y. -- Science. 2005 Jun 10;308(5728):1611-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Earth Sciences Department, Earth and Marine Sciences Building, University of California, Santa Cruz, Santa Cruz, CA 95064, USA. jzachos@emerald.uscs.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15947184" target="_blank"〉PubMed〈/a〉
    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
    Publication Date: 2013-04-20
    Description: The circum-Antarctic Southern Ocean is an important region for global marine food webs and carbon cycling because of sea-ice formation and its unique plankton ecosystem. However, the mechanisms underlying the installation of this distinct ecosystem and the geological timing of its development remain unknown. Here, we show, on the basis of fossil marine dinoflagellate cyst records, that a major restructuring of the Southern Ocean plankton ecosystem occurred abruptly and concomitant with the first major Antarctic glaciation in the earliest Oligocene (~33.6 million years ago). This turnover marks a regime shift in zooplankton-phytoplankton interactions and community structure, which indicates the appearance of eutrophic and seasonally productive environments on the Antarctic margin. We conclude that earliest Oligocene cooling, ice-sheet expansion, and subsequent sea-ice formation were important drivers of biotic evolution in the Southern Ocean.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Houben, Alexander J P -- Bijl, Peter K -- Pross, Jorg -- Bohaty, Steven M -- Passchier, Sandra -- Stickley, Catherine E -- Rohl, Ursula -- Sugisaki, Saiko -- Tauxe, Lisa -- van de Flierdt, Tina -- Olney, Matthew -- Sangiorgi, Francesca -- Sluijs, Appy -- Escutia, Carlota -- Brinkhuis, Henk -- Expedition 318 Scientists -- Dotti, Carlota Escutia -- Klaus, Adam -- Fehr, Annick -- Williams, Trevor -- Bendle, James A P -- Carr, Stephanie A -- Dunbar, Robert B -- Flores, Jose-Abel -- Gonzalez, Jhon J -- Hayden, Travis G -- Iwai, Masao -- Jimenez-Espejo, Francisco J -- Katsuki, Kota -- Kong, Gee Soo -- McKay, Robert M -- Nakai, Mutsumi -- Pekar, Stephen F -- Riesselman, Christina -- Sakai, Toyosaburo -- Salzmann, Ulrich -- Shrivastava, Prakash K -- Tuo, Shouting -- Welsh, Kevin -- Yamane, Masako -- New York, N.Y. -- Science. 2013 Apr 19;340(6130):341-4. doi: 10.1126/science.1223646.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth Sciences, Laboratory of Palaeobotany and Palynology, Faculty of Geosciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, Netherlands. Alexander.Houben@TNO.nl〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23599491" target="_blank"〉PubMed〈/a〉
    Keywords: *Adaptation, Physiological ; Animals ; Antarctic Regions ; Cold Temperature ; Dinoflagellida/*physiology ; *Ecosystem ; Fossils ; *Ice Cover ; *Oceans and Seas ; Phytoplankton/*physiology ; Zooplankton/*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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  • 8
    Publication Date: 2017-03-04
    Description: Global ocean temperatures rapidly warmed by ~5°C during the Paleocene-Eocene Thermal Maximum (PETM; ~56 million years ago). Extratropical sea surface temperatures (SSTs) met or exceeded modern subtropical values. With these warm extratropical temperatures, climate models predict tropical SSTs 〉35°C—near upper physiological temperature limits for many organisms. However, few data are available to test these projected extreme tropical temperatures or their potential lethality. We identify the PETM in a shallow marine sedimentary section deposited in Nigeria. On the basis of planktonic foraminiferal Mg/Ca and oxygen isotope ratios and the molecular proxy TEX86H , latest Paleocene equatorial SSTs were ~33°C, and TEX86H indicates that SSTs rose to 〉36°C during the PETM. This confirms model predictions on the magnitude of polar amplification and refutes the tropical thermostat theory. We attribute a massive drop in dinoflagellate abundance and diversity at peak warmth to thermal stress, showing that the base of tropical food webs is vulnerable to rapid warming.
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
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  • 9
    Publication Date: 2020-09-01
    Description: Global climate cooled from the early Eocene hothouse (∼52–50 Ma) to the latest Eocene (∼34 Ma). At the same time, the tectonic evolution of the Southern Ocean was characterized by the opening and deepening of circum-Antarctic gateways, which affected both surface- and deep-ocean circulation. The Tasmanian Gateway played a key role in regulating ocean throughflow between Australia and Antarctica. Southern Ocean surface currents through and around the Tasmanian Gateway have left recognizable tracers in the spatiotemporal distribution of plankton fossils, including organic-walled dinoflagellate cysts. This spatiotemporal distribution depends on both the physicochemical properties of the water masses and the path of surface-ocean currents. The extent to which climate and tectonics have influenced the distribution and composition of surface currents and thus fossil assemblages has, however, remained unclear. In particular, the contribution of climate change to oceanographic changes, superimposed on long-term and gradual changes induced by tectonics, is still poorly understood. To disentangle the effects of tectonism and climate in the southwest Pacific Ocean, we target a climatic deviation from the long-term Eocene cooling trend: the Middle Eocene Climatic Optimum (MECO; ∼40 Ma). This 500 kyr phase of global warming was unrelated to regional tectonism, and thus provides a test case to investigate the ocean's physicochemical response to climate change alone. We reconstruct changes in surface-water circulation and temperature in and around the Tasmanian Gateway during the MECO through new palynological and organic geochemical records from the central Tasmanian Gateway (Ocean Drilling Program Site 1170), the Otway Basin (southeastern Australia), and the Hampden Beach section (New Zealand). Our results confirm that dinocyst communities track specific surface-ocean currents, yet the variability within the communities can be driven by superimposed temperature change. Together with published results from the east of the Tasmanian Gateway, our new results suggest a shift in surface-ocean circulation during the peak of MECO warmth. Simultaneous with high sea-surface temperatures in the Tasmanian Gateway area, pollen assemblages indicate warm temperate rainforests with paratropical elements along the southeastern margin of Australia. Finally, based on new age constraints, we suggest that a regional southeast Australian transgression might have been coincident with the MECO.
    Print ISSN: 1814-9324
    Electronic ISSN: 1814-9332
    Topics: Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 10
    Publication Date: 2017-10-25
    Description: Astronomical tuning of sediment sequences requires both unambiguous cycle-pattern recognition in climate proxy records and astronomical solutions, and independent information about the phase relationship between these two. Here we present two astronomically tuned age models for the Oligocene-Miocene Transition (OMT) from Integrated Ocean Drilling Program Site U1334 (equatorial Pacific Ocean) to assess the effect tuning approaches have on astronomically calibrated ages and the geologic time scale. These age models are based on different phase-assumptions between climate proxy records and eccentricity: the first age model is based on an inverse and in-phase assumption of CaCO3 weight (wt %) to Earth's orbital eccentricity, the second age model is based on an inverse and in-phase assumption of benthic foraminifer stable carbon isotope ratios (δ13C) to eccentricity. The phase-assumptions that underpin these age models represent two end-members on the range of possible tuning options. To independently test which tuned age model and tuning assumptions are correct, we assign their ages to magnetostratigraphic reversals identified in anomaly profiles. Subsequently we compute tectonic plate-pair spreading rates based on the tuned ages. These alternative spreading rate histories indicate that the CaCO3 tuned age model is most consistent with a conservative assumption of constant spreading rates. The CaCO3 tuned age model thus provides robust ages and durations for polarity chrons C6Bn.1n–C6Cn.1r, which are not based on astronomical tuning in the latest iteration of the Geologic Time Scale. Furthermore, it provides independent evidence that the relatively large (several 10,000 years) time lags documented in the benthic foraminiferal isotope records relative to orbital eccentricity, constitute a real feature of the Oligocene-Miocene climate system and carbon cycle. The age constraints from Site U1334 thus provide independent evidence that the delayed responses of the Oligocene-Miocene climate-cryosphere system and carbon cycle resulted from increased nonlinear feedbacks to astronomical forcing.
    Print ISSN: 1814-9340
    Electronic ISSN: 1814-9359
    Topics: Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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