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  • Articles  (1,727)
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  • 1
    Publication Date: 1955-02-01
    Print ISSN: 0004-945X
    Topics: Biology , Medicine
    Published by Wiley
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  • 2
    Publication Date: 1957-04-01
    Print ISSN: 0014-4754
    Topics: Biology , Medicine
    Published by Springer
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  • 3
    Publication Date: 1911-08-01
    Print ISSN: 0016-7398
    Electronic ISSN: 1475-4959
    Topics: Geography
    Published by Wiley
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 13 (1957), S. 165-166 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 5
    Publication Date: 2023-06-08
    Description: The current development of spaceborne missions to retrieve snow water equivalent requires state-of-the-art modelling systems able to provide accurate estimation of snowpack properties across large areas with contrasted climate and vegetation. In the context of the Terrestrial Snow Mass Mission under development at the Canadian Space Agency, the detailed snowpack model Crocus has been implemented in the Soil Vegetation and Snow (SVS) model. For each grid cell, SVS simulates the snowpack evolution (i) over ground without standing vegetation, (ii) in shrub vegetation and (iii) below trees. For each tile, the model includes the representation of the main snow/vegetation interaction processes. In this study, the ability of SVS/Crocus to simulate snowpack properties is tested along a 4000-km latitudinal transect (47°N to 83°N) in northeastern Canada covering a transition from the boreal forest to arctic ecosystems. Crocus is run at 10-km resolution along this transect over a 13-year period (2007-2019) driven by a meteorological reanalysis recently developed at Environment and Climate Change Canada. A unique dataset of detailed snowpits at multiple sites along the transect is used to evaluate the ability of the model to simulate snowpack properties (SWE, depth-hoar fraction, density and SSA profiles). Results highlight the sensitivity of model results to key physical processes (wind-induced compaction, effect of basal vegetation). Systematic errors were found in snowpack properties and may be explained by missing physical processes in the model such as water vapour fluxes. This work constitutes the first step towards the development of a new pan-Canadian snow modelling system.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 6
    Publication Date: 2022-05-25
    Description: Author Posting. ©American Meteorological Society, 2008. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Bulletin of the American Meteorological Society 89 (2008): 1307-1324, doi:10.1175/2008BAMS2508.1.
    Description: Greenland has a major influence on the atmospheric circulation of the North Atlantic–western European region, dictating the location and strength of mesoscale weather systems around the coastal seas of Greenland and directly influencing synoptic-scale weather systems both locally and downstream over Europe. High winds associated with the local weather systems can induce large air–sea fluxes of heat, moisture, and momentum in a region that is critical to the overturning of the thermohaline circulation, and thus play a key role in controlling the coupled atmosphere–ocean climate system. The Greenland Flow Distortion Experiment (GFDex) is investigating the role of Greenland in defining the structure and predictability of both local and downstream weather systems through a program of aircraft-based observation and numerical modeling. The GFDex observational program is centered upon an aircraft-based field campaign in February and March 2007, at the dawn of the International Polar Year. Twelve missions were flown with the Facility for Airborne Atmospheric Measurements' BAe-146, based out of the Keflavik, Iceland. These included the first aircraft-based observations of a reverse tip jet event, the first aircraft-based observations of barrier winds off of southeast Greenland, two polar mesoscale cyclones, a dramatic case of lee cyclogenesis, and several targeted observation missions into areas where additional observations were predicted to improve forecasts. In this overview of GFDex the background, aims and objectives, and facilities and logistics are described. A summary of the campaign is provided, along with some of the highlights of the experiment.
    Description: The GFDex would not have been possible without the dedication and flexibility shown by all at the FAAM, DirectFlight, and Avalon. GFDex was funded by the Natural Environmental Research Council (NE/C003365/1), the Canadian Foundation for Climate and Atmospheric Sciences (GR-641), and the European Union Fleet for Airborne Research (EUFAR) and European Union Coordinated Observing System (EUCOS) schemes.
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
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  • 7
    Publication Date: 2022-05-25
    Description: Author Posting. © The Natural History Museum, 2012. This article is posted here by permission of Taylor & Francis for reuse for non-commercial purposes only. The definitive version was published in Systematics and Biodiversity 10 (2012): 1-20, doi:10.1080/14772000.2012.665095.
    Description: The time is ripe for a comprehensive mission to explore and document Earth's species. This calls for a campaign to educate and inspire the next generation of professional and citizen species explorers, investments in cyber-infrastructure and collections to meet the unique needs of the producers and consumers of taxonomic information, and the formation and coordination of a multi-institutional, international, transdisciplinary community of researchers, scholars and engineers with the shared objective of creating a comprehensive inventory of species and detailed map of the biosphere. We conclude that an ambitious goal to describe 10 million species in less than 50 years is attainable based on the strength of 250 years of progress, worldwide collections, existing experts, technological innovation and collaborative teamwork. Existing digitization projects are overcoming obstacles of the past, facilitating collaboration and mobilizing literature, data, images and specimens through cyber technologies. Charting the biosphere is enormously complex, yet necessary expertise can be found through partnerships with engineers, information scientists, sociologists, ecologists, climate scientists, conservation biologists, industrial project managers and taxon specialists, from agrostologists to zoophytologists. Benefits to society of the proposed mission would be profound, immediate and enduring, from detection of early responses of flora and fauna to climate change to opening access to evolutionary designs for solutions to countless practical problems. The impacts on the biodiversity, environmental and evolutionary sciences would be transformative, from ecosystem models calibrated in detail to comprehensive understanding of the origin and evolution of life over its 3.8 billion year history. The resultant cyber-enabled taxonomy, or cybertaxonomy, would open access to biodiversity data to developing nations, assure access to reliable data about species, and change how scientists and citizens alike access, use and think about biological diversity information.
    Description: Funds for the ‘Sustain What?’ workshop were provided by Arizona State University (Office of the President, International Institute for Species Exploration and Global Institute of Sustainability) and a grant from the US National Science Foundation (DEB-1102500 to QDW). Further support was provided by the College of Liberal Arts and Sciences, Arizona State University and NSF (DEB-0316614 to SK).
    Keywords: Biodiversity ; Bioinformatics ; Biomimicry ; Biosphere ; Conservation ; Cyberinfrastructure ; Ecology ; Evolution ; International collaboration ; Organization of science ; Origins ; Species ; Sustainability ; Systematics ; Taxonomy ; Team work
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 8
    Publication Date: 2022-06-09
    Description: Exploration of the Martian subsurface, to depths from a few metres to many kilometres, offers an unprecedented opportunity to answer one of the biggest questions contemplated by humankind: was or is there life beyond Earth? Simultaneously, Mars subsurface exploration lays the foundation for self-sufficient human settlements beyond our own planet and provides an emerging potential for synergistic collaborations with the rising commercial space sector and traditional mining companies. Our understanding of the Martian subsurface and the technologies for exploring it — with a dual focus on the search for signs of extinct and extant life, and resource characterization and acquisition — have matured enough for serious consideration as part of future robotic missions to Mars.
    Description: Published
    Description: 116–120
    Description: 6A. Geochimica per l'ambiente
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 9
    Publication Date: 2023-09-27
    Description: 〈jats:p〉Anthropogenic climate change is altering global biogeographical patterns. However, it remains difficult to quantify how bioregions are changing because pre‐industrial records of species distributions are rare. Marine microfossils, such as planktonic foraminifera, are preserved in seafloor sediments and allow the quantification of bioregions in the past. Using a recently compiled data set of pre‐industrial species composition of planktonic foraminifera in 3802 worldwide seafloor sediments, we employed multivariate and statistical model‐based approaches to study spatial turnover in order to 1) quantify planktonic foraminifera bioregions and 2) understand the environmental drivers of species turnover. Four latitudinally banded bioregions emerge from the global assemblage data. The polar and temperate bioregions are bi‐hemispheric, supporting the idea that planktonic foraminifera species are not limited by dispersal. The equatorial bioregion shows complex longitudinal patterns and overlaps in sea surface temperature (SST) range with the tropical bioregion. Compositional‐turnover models (Bayesian bootstrap generalised dissimilarity models) identify SST as the strongest driver of species turnover. The turnover rate is constant across most of the SST gradient, showing no SST threshold values with rapid shifts in species composition, but decelerates above 25°C, suggesting SST is less predictive of species composition in warmer waters. Other environmental predictors affect species turnover non‐linearly, and their importance differs across regions. In the Pacific ocean, net primary productivity below 500 mgC m〈jats:sup〉−2〈/jats:sup〉 day〈jats:sup〉−1〈/jats:sup〉 drives fast compositional change. Water depth values below 3000 m (which affect calcareous microfossil preservation) increasingly drive changes in species composition among death assemblages in the Pacific and Indian oceans. Together, our results suggest that the dynamics of planktonic foraminifera bioregions are expected to be highly responsive to climate change; however, at lower latitudes, environmental drivers other than SST may affect these dynamics.〈/jats:p〉
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
    Format: application/pdf
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  • 10
    Publication Date: 2015-02-17
    Description: Mammalian neocortex is characterized by a layered architecture and a common or “canonical” microcircuit governing information flow among layers. This microcircuit is thought to underlie the computations required for complex behavior. Despite the absence of a six-layered cortex, birds are capable of complex cognition and behavior. In addition, the avian auditory pallium is composed of adjacent information-processing regions with genetically identified neuron types and projections among regions comparable with those found in the neocortex. Here, we show that the avian auditory pallium exhibits the same information-processing principles that define the canonical cortical microcircuit, long thought to have evolved only in mammals. These results suggest that the canonical cortical microcircuit evolved in a common ancestor of mammals and birds and provide a physiological explanation for the evolution of neural processes that give rise to complex behavior in the absence of cortical lamination.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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