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  • 2020-2024  (14)
  • 1995-1999  (145)
  • 1955-1959  (8)
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  • 1
    Online Resource
    Online Resource
    Cham :Springer International Publishing :
    Keywords: Ecology . ; Conservation biology. ; Zoology. ; Biodiversity. ; Ecology. ; Conservation Biology. ; Zoology. ; Biodiversity.
    Description / Table of Contents: Introduction -- Part I. Ethology and Behavioral Ecology of Sea Otters -- Taxonomy and Evolution of Sea Otters -- Sea Otter Behavior: Morphologic, Physiologic, and Sensory Adaptations -- Sea Otter Foraging Behavior -- Social Structure of Marine Otters: Inter and Intraspecific Variation -- Reproductive Behavior of Male Sea Otters -- Reproductive Behavior of Female Sea Otters and Their Pups -- Sea Otter Behavior and Its Influence on Littoral Community Structure -- Sea Otter Predator Avoidance Behavior -- Sea Otters and the Maritime Fur Trade -- Part II. Ethology and Behavioral Ecology of Polar Bears -- Polar Bear Taxonomy and Evolution -- Polar Bear Behavior: Morphologic and Physiologic Adaptations -- Polar Bear Foraging Behavior -- Polar Bear Reproductive and Denning Behavior -- Polar Bear Maternal Care, Neonatal Development, and Social Behavior -- Polar Bear Behavior in Response to Climate Change -- Human-Polar Bear Interactions.
    Abstract: Sea otters and polar bears are carnivorous marine mammals that still resemble their terrestrial ancestors. Compared with Cetacea (whales and dolphins), Sirenia (dugongs and manatees), and Pinnipedia (seals, sea lions, and walrus), they are less adapted for an aquatic life and the most recently evolved among marine mammals. Sea otters are amphibious but seldom come ashore, and polar bears primarily occur on sea ice or along the shore. When at sea, both species spend most of their time swimming at the surface or making short, shallow dives when foraging or pursuing prey. Indeed, polar bears rarely pursue seals in water. Nevertheless, polar bears are powerful swimmers and will stalk seals from the water. As with many other large carnivores, they are solitary hunters. Although sea otters are gregarious and form aggregations at sea called rafts, they are primarily asocial. Except during mating, the principal interaction among sea otters occurs between a female and offspring during the six-month dependency period. In large carnivores (e.g., wolves and lions) that feed on ungulates, sociality and cooperation are favored because of the need to capture large prey and defend carcasses. Polar bears, which are the largest terrestrial carnivore, are solitary hunters of seals and are neither gregarious nor social. Males and females briefly associate during courtship and mating. During this time, males aggressively compete for females. At other times, males generally avoid each other except for aggregations of males that form while summering on land, and females with cubs avoid males, which are known for infanticide. As with sea otters, the interaction of polar bears outside of mating occurs between a female and her offspring during the 2-3 year dependency period. This interaction is critically important when altricial cubs are born in the winter den. This book provides new insight into the ethology and behavioral ecology of sea otters and polar bears. Each chapter reviews the discoveries of previous studies and integrates recent research using new techniques and technology. The authors also address historic and current anthropogenic challenges for their survival as climate change alters entire marine ecosystems.
    Type of Medium: Online Resource
    Pages: XIV, 363 p. 110 illus., 89 illus. in color. , online resource.
    Edition: 1st ed. 2021.
    ISBN: 9783030667962
    Series Statement: Ethology and Behavioral Ecology of Marine Mammals,
    DDC: 577
    Language: English
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  • 2
    Keywords: Fungi. ; Mycology. ; Microbiology. ; Plants Evolution. ; Plant biotechnology. ; Plant diseases. ; Plants Development. ; Fungi. ; Plant Evolution. ; Plant Biotechnology. ; Plant Pathology. ; Plant Development. ; Microbiology.
    Description / Table of Contents: 1. Overview -- 2. Ectomycorrhizal fungi invasions in Southern South America -- 3. Pseudomonotes tropenbosii, an endemic Dipterocarp tree from a Neotropical terra firme forest in Colombian Amazonia that hosts ectomycorrhizal fungi -- 4. Arbuscular Mycorrhizal Fungi in the Colombian Amazon: A Historical Review -- 5. AMF diversity in coffee and cacao agroforestry systems: importance for crop productivity and forest conservation -- 6. Potential of arbuscular mycorrhizas for the remediation of soils impacted with pollutants -- 7. Diversity of Arbuscular Mycorrhizal Fungi in the Ecuadorian Amazon region. -- 8. Orchid Mycorrhizas in South America: Tropical and Subtropical Ecosystems -- 9. Symbiotic propagation of South American orchids -- 10. Arbuscular mycorrhizal fungi in agroecosystems of East-Central Argentina: two agricultural practices effects on taxonomic groups -- 11. Metal soil contamination, metallophytes and arbuscular mycorrhizal fungi from South America -- 12. Native and exotic woodland from Patagonian Andes: Anthropic impacts and Mycorrhizas -- 13. Current Knowledge on Mycorrhizal Symbiosis and Endophytes in northwest Patagonia, Argentina -- 14. Mycorrhizas in Nothofagus from South America: what do we know from nursery and field experiences? -- 15. Arbuscular mycorrhizal fungi in the Espinal Ecoregion, gaps and opportunities -- 16. Edible ectomycorrhizal mushrooms in South America -- 17. Arbuscular mycorrhizal symbiosis in temperate grassland forage species of Argentina -- 18. Current trends and challenges in viticulture using arbuscular mycorrhizal fungi -- 19. Communities of Glomeromycota in the Argentine Arid Diagonal: an approach from their ecological role in grassland management and use -- 20. The current scenario of the distribution, functionality and ecosystemic role of the arbuscular mycorrhizal symbiosis in Chile -- 21. Mycorrhizas and Restoration in South America -- 22. Gaps in South American mycorrhizal biodiversity and ecosystem function research.
    Abstract: In order to feed the world, global agriculture will have to double food production by 2050. As a result, the use of soils with fertilizers and pesticides in agronomic ecosystems will increase, taking into account the sustainability of these systems and also the provision of food security. Thus, soil ecosystems, their health, and their quality are directly involved in sustainable agronomical practices, and it is important to recognize the important role of soil microbial communities such as mycorrhizal fungi, their biodiversity, interactions, and functioning. Soil ecosystems are under the threat of biodiversity loss due to an increase of cultivated areas and agronomic exploitation intensity. Also, changes in land use alter the structure and function of ecosystems where biodiversity is vital in the ecosystem. Soils are a major aid in food production in all terrestrial ecosystems; however, this means they are also involved in gas emission and global warming. Thus, in agronomic ecosystems, several mitigation practices have been proposed to promote the increase of carbon soil stock, and the reduction of warming gas emission from soils. In South America, most of the rural population depends economically on agriculture and usually works in family units. New, organic, safe, and sustainable agro-forestry practices must be applied to support local communities and countries to achieve hunger eradication, rural poverty reduction, and sustainable development. This book compiles new information for mycorrhizal occurrence in natural and anthropic environments in South America. It includes new reports of mycorrhizal fungi diversity along different mycorrhizal types and their effect on plant communities, plant invasions, the use of mycorrhizal fungi for ecological and sustainable studies, management programs of natural and agroecosystems, and forestry and food-secure production. This book fills the gaps in biodiversity knowledge, management and safe food production of mycorrhizas. It should be a valuable help to researchers, professors and students, to aid in use of mycorrhizal fungi while also focusing on their biodiversity, sustainable safe food production, and conservation perspectives.
    Type of Medium: Online Resource
    Pages: VIII, 465 p. 65 illus., 58 illus. in color. , online resource.
    Edition: 1st ed. 2022.
    ISBN: 9783031129940
    Series Statement: Fungal Biology,
    DDC: 579.5
    Language: English
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  • 3
  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 77 (1955), S. 4557-4559 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 81 (1959), S. 5420-5423 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 77 (1955), S. 89-92 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 3401-3407 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Explicit analytic expressions for the lobe structures of the critical current versus magnetic field are provided for small arbitrarily shaped four-sided Josephson junctions. The orientation of the external parallel magnetic field, in the plane of the junction, is also arbitrary. Several configurations worth noting are considered in detail for rhomboid, triangle, parallelogram, and trapezium junctions, once the dependence from the normalized magnetic field has been introduced. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Environmental science & technology 29 (1995), S. 2584-2589 
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 5024-5029 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on a new experimental approach to the size estimation of the hot spot induced by ionizing particles in a Josephson tunnel junction. Here, in contrast to the case of a superconducting strip, it is possible to investigate the hot spot dynamics in absence of effects due to the heating induced by the bias current. The reported experiment is based on the motion of Abrikosov vortices, trapped in the thin films constituting the junction electrodes, under 5.6 MeV α-particle irradiation. The fast time evolution of a hot spot, combined with the presence of Abrikosov vortices, produces a change of the static magnetic field in the junction area and thus a change of the critical current value, Ic. Measurements of Ic during the α-particle irradiation and in presence of trapped Abrikosov vortices allow to determine the rate of appearance of those Ic changes. The behavior of the average appearance rate as function of the Abrikosov vortices density provides a direct determination of the maximum hot spot area. The experiment is performed on a high quality Nb/Al–AlOx/Nb junction of circular geometry and with "small" dimensions with respect to the Josephson penetration depth. A value of 4.7±1.2 μm2 is found for the maximum hot spot area. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK and Boston, USA : Blackwell Publishers Ltd
    Labour 13 (1999), S. 0 
    ISSN: 1467-9914
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: In this paper we assess whether regional disparities in the euro area stimulate labour mobility, using migration behaviour in US states as a benchmark. Large regional disparities within European countries and size differences between them and US states led us to select regions as the appropriate unit of analysis for Europe. While the level of net immigration flows with respect to population is similar in the USA and the euro area, our study shows that its sensitivity to regional disparities differs considerably. Indeed, migration is much more significantly influenced by income disparities in the USA than it is in the Euro-11, both in the short and the long term. Furthermore, the responsiveness of net migration inflows to shocks to the relative unemployment rate is negative in the regions of the USA, but nil in those of the Euro-11. Finally, risk factors (identified in the theoretical model as the variance of income) are significant determinants of migration decisions in Europe but not in the USA.
    Type of Medium: Electronic Resource
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