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  • 1
    Publication Date: 2016-03-04
    Description: Molecular dating has become central to placing a temporal dimension on the tree of life. Methods for estimating divergence times have been developed for over 50 years, beginning with the proposal of molecular clock in 1962. We categorize the chronological development of these methods into four generations based on the timing of their origin. In the first generation approaches (1960s–1980s), a strict molecular clock was assumed to date divergences. In the second generation approaches (1990s), the equality of evolutionary rates between species was first tested and then a strict molecular clock applied to estimate divergence times. The third generation approaches (since ~2000) account for differences in evolutionary rates across the tree by using a statistical model, obviating the need to assume a clock or to test the equality of evolutionary rates among species. Bayesian methods in the third generation require a specific or uniform prior on the speciation-process and enable the inclusion of uncertainty in clock calibrations. The fourth generation approaches (since 2012) allow rates to vary from branch to branch, but do not need prior selection of a statistical model to describe the rate variation or the specification of speciation model. With high accuracy, comparable to Bayesian approaches, and speeds that are orders of magnitude faster, fourth generation methods are able to produce reliable timetrees of thousands of species using genome scale data. We found that early time estimates from second generation studies are similar to those of third and fourth generation studies, indicating that methodological advances have not fundamentally altered the timetree of life, but rather have facilitated time estimation by enabling the inclusion of more species. Nonetheless, we feel an urgent need for testing the accuracy and precision of third and fourth generation methods, including their robustness to misspecification of priors in the analysis of large phylogenies and data sets.
    Print ISSN: 0737-4038
    Electronic ISSN: 1537-1719
    Topics: Biology
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  • 2
    Publication Date: 2012-08-24
    Description: Introduction The world’s biodiversity is in crisis (e.g. Terborgh, 1999; Ceballos et al ., 2010; Cardinale et al ., 2012). Of biodiversity’s various levels, species hold a special place in the imagination of conservationists and the public alike: people equate to them more readily than to elements such as genes and ecosystems. The IUCN Red List of Threatened Species categorises species’ extinction risk (Vié et al ., 2009). Recent comprehensive Red List assessments show high threat levels for amphibians (30% of 6,347 species considered globally threatened), birds (12% of 9,990), mammals (21% of 5,488), cycads (52% of 289), conifers (28% of 620) and freshwater crabs (17% of 1,281 species; but a further 49% of them were listed as Data Deficient) (Cumberlidge et al ., 2009; Hilton-Taylor et al ., 2009). Recent losses far exceed typical ‘background’ extinction rates, those before people dominated the earth (e.g. Baillie et al ., 2004; McCullum, 2007; Ceballos et al ., 2010). Moreover, the Red Li...
    Print ISSN: 1993-3800
    Electronic ISSN: 1993-3819
    Topics: Energy, Environment Protection, Nuclear Power Engineering
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  • 3
    Publication Date: 2018-10-06
    Description: Author(s): C. Awe, P. S. Barbeau, J. I. Collar, S. Hedges, and L. Li We study the response of EJ-301 liquid scintillator to monochromatic 244.6 ± 8.4  keV neutrons, targeting the 10–100 keV proton recoil energy interval. Limited experimental information exists for proton light yield in this range, for this or any other organic scintillator. Our results confirm the adequ... [Phys. Rev. C 98, 045802] Published Fri Oct 05, 2018
    Keywords: Nuclear Astrophysics
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
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  • 4
    Publication Date: 2008-10-11
    Description: Knowledge of mammalian diversity is still surprisingly disparate, both regionally and taxonomically. Here, we present a comprehensive assessment of the conservation status and distribution of the world's mammals. Data, compiled by 1700+ experts, cover all 5487 species, including marine mammals. Global macroecological patterns are very different for land and marine species but suggest common mechanisms driving diversity and endemism across systems. Compared with land species, threat levels are higher among marine mammals, driven by different processes (accidental mortality and pollution, rather than habitat loss), and are spatially distinct (peaking in northern oceans, rather than in Southeast Asia). Marine mammals are also disproportionately poorly known. These data are made freely available to support further scientific developments and conservation action.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schipper, Jan -- Chanson, Janice S -- Chiozza, Federica -- Cox, Neil A -- Hoffmann, Michael -- Katariya, Vineet -- Lamoreux, John -- Rodrigues, Ana S L -- Stuart, Simon N -- Temple, Helen J -- Baillie, Jonathan -- Boitani, Luigi -- Lacher, Thomas E Jr -- Mittermeier, Russell A -- Smith, Andrew T -- Absolon, Daniel -- Aguiar, John M -- Amori, Giovanni -- Bakkour, Noura -- Baldi, Ricardo -- Berridge, Richard J -- Bielby, Jon -- Black, Patricia Ann -- Blanc, J Julian -- Brooks, Thomas M -- Burton, James A -- Butynski, Thomas M -- Catullo, Gianluca -- Chapman, Roselle -- Cokeliss, Zoe -- Collen, Ben -- Conroy, Jim -- Cooke, Justin G -- da Fonseca, Gustavo A B -- Derocher, Andrew E -- Dublin, Holly T -- Duckworth, J W -- Emmons, Louise -- Emslie, Richard H -- Festa-Bianchet, Marco -- Foster, Matt -- Foster, Sabrina -- Garshelis, David L -- Gates, Cormack -- Gimenez-Dixon, Mariano -- Gonzalez, Susana -- Gonzalez-Maya, Jose Fernando -- Good, Tatjana C -- Hammerson, Geoffrey -- Hammond, Philip S -- Happold, David -- Happold, Meredith -- Hare, John -- Harris, Richard B -- Hawkins, Clare E -- Haywood, Mandy -- Heaney, Lawrence R -- Hedges, Simon -- Helgen, Kristofer M -- Hilton-Taylor, Craig -- Hussain, Syed Ainul -- Ishii, Nobuo -- Jefferson, Thomas A -- Jenkins, Richard K B -- Johnston, Charlotte H -- Keith, Mark -- Kingdon, Jonathan -- Knox, David H -- Kovacs, Kit M -- Langhammer, Penny -- Leus, Kristin -- Lewison, Rebecca -- Lichtenstein, Gabriela -- Lowry, Lloyd F -- Macavoy, Zoe -- Mace, Georgina M -- Mallon, David P -- Masi, Monica -- McKnight, Meghan W -- Medellin, Rodrigo A -- Medici, Patricia -- Mills, Gus -- Moehlman, Patricia D -- Molur, Sanjay -- Mora, Arturo -- Nowell, Kristin -- Oates, John F -- Olech, Wanda -- Oliver, William R L -- Oprea, Monik -- Patterson, Bruce D -- Perrin, William F -- Polidoro, Beth A -- Pollock, Caroline -- Powel, Abigail -- Protas, Yelizaveta -- Racey, Paul -- Ragle, Jim -- Ramani, Pavithra -- Rathbun, Galen -- Reeves, Randall R -- Reilly, Stephen B -- Reynolds, John E 3rd -- Rondinini, Carlo -- Rosell-Ambal, Ruth Grace -- Rulli, Monica -- Rylands, Anthony B -- Savini, Simona -- Schank, Cody J -- Sechrest, Wes -- Self-Sullivan, Caryn -- Shoemaker, Alan -- Sillero-Zubiri, Claudio -- De Silva, Naamal -- Smith, David E -- Srinivasulu, Chelmala -- Stephenson, Peter J -- van Strien, Nico -- Talukdar, Bibhab Kumar -- Taylor, Barbara L -- Timmins, Rob -- Tirira, Diego G -- Tognelli, Marcelo F -- Tsytsulina, Katerina -- Veiga, Liza M -- Vie, Jean-Christophe -- Williamson, Elizabeth A -- Wyatt, Sarah A -- Xie, Yan -- Young, Bruce E -- New York, N.Y. -- Science. 2008 Oct 10;322(5899):225-30. doi: 10.1126/science.1165115.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉International Union for Conservation of Nature (IUCN) Species Programme, IUCN, 28 Rue Mauverney, 1196 Gland, Switzerland. jan.schipper@iucn.org〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18845749" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biodiversity ; Body Size ; Conservation of Natural Resources ; Databases, Factual ; Ecosystem ; *Extinction, Biological ; *Mammals/anatomy & histology/classification/physiology ; Marine Biology ; Phylogeny ; Population Dynamics ; Seawater
    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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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2014-07-26
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Woodroffe, Rosie -- Hedges, Simon -- Durant, Sarah -- New York, N.Y. -- Science. 2014 Jul 25;345(6195):389-90. doi: 10.1126/science.345.6195.389-b. Epub 2014 Jul 24.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Zoology, Zoological Society of London, London, NW1 4RY, UK. rosie.woodroffe@ioz.ac.uk. ; Wildlife Conservation Society, Bronx, NY 10460, USA. ; Institute of Zoology, Zoological Society of London, London, NW1 4RY, UK. Wildlife Conservation Society, Bronx, NY 10460, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25061195" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Animals, Wild ; *Biodiversity ; *Conservation of Natural Resources ; *Ecosystem ; Humans
    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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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2014-04-05
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Woodroffe, Rosie -- Hedges, Simon -- Durant, Sarah M -- New York, N.Y. -- Science. 2014 Apr 4;344(6179):46-8. doi: 10.1126/science.1246251.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Zoology, Regent's Park, London NW1 4RY, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24700847" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Animals, Wild ; *Biodiversity ; *Conservation of Natural Resources ; *Ecosystem ; Humans
    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: 2013-05-01
    Description: Introduction The world’s biodiversity is in crisis (e.g. Terborgh, 1999; Ceballos et al ., 2010; Cardinale et al ., 2012). Of biodiversity’s various levels, species hold a special place in the imagination of conservationists and the public alike: people equate to them more readily than to elements such as genes and ecosystems. The IUCN Red List of Threatened Species categorises species’ extinction risk (Vié et al ., 2009). Recent comprehensive Red List assessments show high threat levels for amphibians (30% of 6,347 species considered globally threatened), birds (12% of 9,990), mammals (21% of 5,488), cycads (52% of 289), conifers (28% of 620) and freshwater crabs (17% of 1,281 species; but a further 49% of them were listed as Data Deficient) (Cumberlidge et al ., 2009; Hilton-Taylor et al ., 2009). Recent losses far exceed typical ‘background’ extinction rates, those before people dominated the earth (e.g. Baillie et al ., 2004; McCullum, 2007; Ceballos et al ., 2010). Moreover, the Red Li...
    Print ISSN: 1993-3800
    Electronic ISSN: 1993-3819
    Topics: Energy, Environment Protection, Nuclear Power Engineering
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  • 8
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Ecology, Evolution, and Systematics 27 (1996), S. 163-196 
    ISSN: 0066-4162
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Notes: Abstract The vertebrate fauna of the West Indies (1262 species) exhibits high levels of endemism and has a taxonomic composition characteristic of more isolated oceanic islands. Many groups that are widespread on the mainland are absent in the islands, and some of those present are characterized by large adaptive radiations. The growing fossil record of West Indian vertebrates, including mid-Tertiary amber fossils (considered here to be 20-30 million years old), indicates that this pattern of reduced higher-taxon diversity has persisted for a long period of time. Phylogenetic relationships of nonvolant groups display a strong South American influence, whereas volant groups (birds and bats) and freshwater fish show closer ties with Central and North America. Molecular estimates of divergence times between island taxa and their mainland counterparts indicate a Cenozoic origin (within the last 65 million years) for nearly all groups examined. Together, data from different sources point to an origin by overwater dispersal for a large majority of the vertebrate fauna. The prevailing current direction, from southeast to northwest, and the wide scattering of estimated times of origin suggest that much of the nonvolant fauna arrived by flotsam carried from the mouths of major rivers in northeastern South America. Spatial relationships, especially considering low sea levels during the Pleistocene, appear to better explain the routes of colonization taken by the volant fauna and freshwater fish. Caribbean geologic history does not preclude an origin by late Mesozoic vicariance for several possibly ancient groups, although an early Cenozoic arrival by dispersal also cannot be discounted. An integrative approach to historical biogeography is shown to be more insightful than the current trend in the field, cladistic biogeography, which places prime emphasis only on phylogenetic relationships.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Nuclear Instruments and Methods in Physics Research Section A: 275 (1989), S. 484-493 
    ISSN: 0168-9002
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Nuclear Instruments and Methods in Physics Research Section A: 288 (1990), S. 236-239 
    ISSN: 0168-9002
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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