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  • 2020-2022  (1)
  • 1995-1999  (24)
  • 1
    Online-Ressource
    Online-Ressource
    Cary :Oxford University Press, Incorporated,
    Schlagwort(e): Birds -- Conservation -- America. ; Birds -- Migration -- America. ; Birds -- Ecology -- America. ; Birds -- Habitat -- America. ; Electronic books.
    Beschreibung / Inhaltsverzeichnis: The apparent decline in numbers among many species of migratory songbirds is a timely subject in conservation biology, particularly for ornithologists, ecologists, and wildlife managers. This book is an attempt to discuss the problem in full scope. It presents an ambitious, comprehensive assessment of the current status of neotropical migratory birds in the U.S., and the methods and strategies used to conserve migrant populations. Each chapter is an essay reviewing and assessing the trend from a different viewpoint, all written by leaders in the fields of ornithology, conservation, and population biology.
    Materialart: Online-Ressource
    Seiten: 1 online resource (506 pages)
    Ausgabe: 1st ed.
    ISBN: 9780195359176
    DDC: 598.252/5/097
    Sprache: Englisch
    Anmerkung: Intro -- Contents -- Introduction: Importance of Knowledge and its Application in Neotropical Migratory Birds -- PART I: POPULATION TRENDS -- 1 Population Trends from the North American Breeding Bird Survey -- 2 The Strength of Inferences about Causes of Trends in Populations -- PART II: TEMPORAL PERSPECTIVES ON POPULATION LIMITATION AND HABITAT USE -- 3 When and How are Populations Limited? The Roles of Insect Outbreaks, Fire, and Other Natural Perturbations -- 4 Summer versus Winter Limitation of Populations: What are the Issues and What is the Evidence? -- 5 Habitat Requirements During Migration: Important Link in Conservation -- 6 Habitat Use and Conservation in the Neotropics -- PART III: FOREST MANAGEMENT -- 7 Impacts of Silviculture: Overview and Management Recommendations -- 8 Effects of Silvicultural Treatments in the Rocky Mountains -- 9 Silviculture in Central and Southeastern Oak Pine Forests -- PART IV: GENERAL HUMAN EFFECTS -- 10 Effects of Agricultural Practices and Farmland Structures -- 11 An Assessment of Potential Hazards of Pesticides and Environmental Contaminants -- 12 Livestock Grazing Effects in Western North America -- PART V: SCALE PERSPECTIVES -- 13 Habitat Fragmentation in the Temperate Zone -- 14 A Landscape Ecology Perspective for Research, Conservation, and Management -- 15 Ecology and Behavior of Cowbirds and their Impact on Host Populations -- 16 Single-Species versus Multiple-Species Approaches for Management -- 17 Summary: Model Organisms for Advancing Understanding of Ecology and Land Management -- Index -- A -- B -- C -- D -- E -- F -- G -- H -- I -- K -- L -- M -- N -- O -- P -- R -- S -- T -- W.
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    Online-Ressource
    Online-Ressource
    Charlottesville, Va : University of Virginia Library
    Schlagwort(e): Edison, Thomas A. ; Edison, Thomas A. 1847-1931 Edison, Thomas A. 1847-1931 ; Edison, Thomas A ; Edison, Thomas A. ; Inventors Biography ; United States ; Inventors Biography ; United States ; United States ; Inventors Biography ; Electronic books ; Inventors Biography. ; Electronic books. ; Electronic books Biography
    Materialart: Online-Ressource
    ISBN: 0585233187 , 9780585233185
    Serie: EBSCOhost eBook Collection
    Sprache: Englisch
    Anmerkung: *Vol. 2* , The text for this NetLibrary eBook was obtained from the University of Virginia Library Electronic Text Center , Access may be limited to NetLibrary affiliated libraries , Mode of access: World Wide Web.
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Marine mammal science 15 (1999), S. 0 
    ISSN: 1748-7692
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: We recorded the blows of gray whales during their southbound migration past central California in January 1994, 1995, and 1996, using thermal imaging sensors. For our sampling purposes, we defined day (0730–1630) and night (1630–0730) to coincide with the on/off effort periods of the visual counts being conducted concurrently. We pooled data across the three years of sampling and tested for diel variation in surfacing interval, pod size, offshore distance, migration rate, and swimming speed by comparing paired day/night means for samples collected within the respective 24-h period. We performed these tests using data from the entire migration period and then repeated the tests for samples collected prior to and after the approximate median migration date (15 January). Over the entire migration period we observed larger diurnal pod sizes (x̄day= 1.75 ± 0.280, x̄night= 1.63 ± 0.232) and greater diurnal offshore distances (x̄day= 2.30 ± 0.328 km, x̄night= 2.03 ± 0.356 km) but found no diel variation in surfacing interval. For the entire migration period, the nocturnal migration rate (average number of whales passing per hour) was higher than the diurnal rate. During the first half of the migration we detected no diel variation in pod size or surfacing interval, but diurnal offshore distances were larger than at night (x̄day= 2.28 ± 0.273 km, x̄night= 1.96 ± 0.318 km). Diurnal and nocturnal migration rates prior to 15 January were not different. During the second half of the migration, there was no diel variation in surfacing interval, pod size, or distance offshore, but the nocturnal migration rate was higher (28%, SE = 11.6%) than the diurnal rate. We found no diel variation in swimming speed in any comparison. We propose that later migrants socialize more during the day, which effectively slows their diurnal rate of migration relative to nocturnal rates.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 8845-8854 
    ISSN: 1520-5835
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 5
    ISSN: 1520-510X
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Restoration ecology 3 (1995), S. 0 
    ISSN: 1526-100X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: When the Kissimmee River was channelized in the 1960s and 1970s and placed under stage-fluctuation management, the dynamic interactions between the river and the flood-plain were essentially removed. Correspondingly, aquatic invertebrate life in the river and floodplain ecosystem shifted from a riverine to a more lacustrine fauna. A relinkage of the Kissimmee River with the floodplain following restoration will result in numerous changes to such ecologically important factors as streamflow, substrate composition, food quality and quantity, and water quality, all of which will influence invertebrate communities. These factors and their function in the ecosystem as the fauna shifts from predominantly lacustrine back to riverine are presented in a conceptual model. As an integral component of all aquatic ecosystems and a key link between primary producers and higher trophic levels, aquatic invertebrates are a valuable group with which to evaluate the recovery of the Kissimmee River. Utilization of a geographic information system mapping approach linking expected increased habitat heterogeneity and invertebrate richness with restoration efforts is suggested as an economical means of monitoring recovery of the Kissimmee River ecosystem.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Springer
    Skeletal radiology 26 (1997), S. 319-322 
    ISSN: 1432-2161
    Schlagwort(e): Key words Mycetoma ; Magnetic resonance imaging ; Calf ; Granulomatous infection ; Actinomycetes ; Sulfur granules
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Actinomycetous infections typically involve either the head and neck or the extremities following a traumatic implantation. Classic clinical associations are draining sinus tracts. This case report describes the pathologic and MR findings of a relatively acute mycetomatous process involving the soft tissues. Pathologic findings in this case included an occasional granule composed of gram positive, thin branching elements. These and other findings were consistent with actinomycetes bacterium infection. The discussion centers around the use of MR, both with and without gadolinium, in evaluating this type of granulomatous infection. Infiltration of the adjacent subcutaneous tissues was easier to appreciate on both the T1-weighted images without gadolinium and the T1-weighted images with gadolinium when compared to the T2-weighted images. Signal characteristics as described in this case report may suggest a granulomatous process.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    [s.l.] : Nature Publishing Group
    Nature medicine 3 (1997), S. 272-273 
    ISSN: 1546-170X
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Medizin
    Notizen: [Auszug] ISAAC NEWTON'S THIRD Law of Motion is as germane to inflammation as it is to the interactions between two physical bodies. For every agonist, there is an equal and opposite antagonist that tends to restore the balance of the forces unleashed in the acute inflammatory response. In this issue ...
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 9
    ISSN: 1546-170X
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Medizin
    Notizen: [Auszug] Airway hyperresponsiveness (AHR) is a hallmark of asthma1 and a heritable polygenic trait in the mouse2. In the mouse, candidate gene products of hematopoietic origin implicated in asthma mapped to the regions of the previously defined quantitative trait loci2. Since hematopoietic cells3–5 ...
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 10
    ISSN: 1546-1718
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Medizin
    Notizen: [Auszug] Airway hyperresponsiveness is a key characteristic of human asthma and a marker for asthma–like conditions in animals. F1 mice derived from A/J and C57BL/6J display a phenotype which resembles the asthma–like phenotype of the A/J mice. Since airway responsiveness failed to segregate as ...
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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