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  • 2010-2014  (68)
  • 2005-2009  (55)
  • 1995-1999  (46)
  • 1940-1944  (3)
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  • 1
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    (Table 1) Krill (Euphausia superba) biomass estimates at South Georgia Island from 2001-2005 (2010)
    PANGAEA
    In:  Supplement to: Reid, Keith; Watkins, Jon L; Murphy, Eugene J; Trathan, Phil N; Fielding, Sophie; Enderlein, Peter (2010): Krill population dynamics at South Georgia: implications for ecosystem-based fisheries management. Marine Ecology Progress Series, 399, 243-252, https://doi.org/10.3354/meps08356
    Details
    Publication Date: 2023-12-13
    Description: The South Georgia region supports a large biomass of krill that is subject to high interannual variability. The apparent lack of a locally self-maintaining krill population at South Georgia means that understanding the mechanism underlying these observed population characteristics is essential to successful ecosystem-based management of krill fishery in the region. Krill acoustic-density data from surveys conducted in the early, middle and late period of the summers of 2001 to 2005, together with krill population size structure over the same period from predator diet data, were used with a krill population dynamics model to evaluate potential mechanisms behind the observed changes in krill biomass. Krill abundance was highest during the middle of the summer in 3 years and in the late period in 2 years; in the latter there was evidence that krill recruitment was delayed by several months. A model scenario that included empirically derived estimates of both the magnitude and timing of recruitment in each year showed the greatest correlation with the acoustic series. The results are consistent with a krill population with allochthonous recruitment entering a retained adult population; i.e. oceanic transport of adult krill does not appear to be the major factor determining the dynamics of the adult population. The results highlight the importance of the timing of recruitment, especially where this could introduce a mismatch between the peak of krill abundance and the peak demand from predators, which may exacerbate the effects of changes in krill populations arising from commercial harvesting and/or climate change.
    Keywords: Coefficient; DATE/TIME; ECHO; Echosounder; Euphausia superba, biomass; International Polar Year (2007-2008); IPY; South_Georgia_NW; South Georgia Island; Time coverage
    Type: Dataset
    Format: text/tab-separated-values, 48 data points
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    DATA PANGAEA
  • 2
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    Seawater carbonate chemistry and proportion of different dissolution levels in live juvenile Limacina helicina antarctica from the natural environment and ship-board incubations (2012)
    PANGAEA
    In:  Supplement to: Bednaršek, Nina; Tarling, Geraint A; Bakker, Dorothee C E; Fielding, Sophie; Jones, Elizabeth M; Venables, H J; Ward, Peter; Kuzirian, Alan; Lézé, Bertrand; Feely, Richard A; Murphy, Eugene J (2012): Extensive dissolution of live pteropods in the Southern Ocean. Nature Geoscience, 5(12), 881-885, https://doi.org/10.1038/ngeo1635
    Details
    Publication Date: 2024-05-22
    Description: The carbonate chemistry of the surface ocean is rapidly changing with ocean acidification, a result of human activities. In the upper layers of the Southern Ocean, aragonite-a metastable form of calcium carbonate with rapid dissolution kinetics-may become undersaturated by 2050. Aragonite undersaturation is likely to affect aragonite-shelled organisms, which can dominate surface water communities in polar regions. Here we present analyses of specimens of the pteropod Limacina helicina antarctica that were extracted live from the Southern Ocean early in 2008. We sampled from the top 200 m of the water column, where aragonite saturation levels were around 1, as upwelled deep water is mixed with surface water containing anthropogenic CO2. Comparing the shell structure with samples from aragonite-supersaturated regions elsewhere under a scanning electron microscope, we found severe levels of shell dissolution in the undersaturated region alone. According to laboratory incubations of intact samples with a range of aragonite saturation levels, eight days of incubation in aragonite saturation levels of 0.94-1.12 produces equivalent levels of dissolution. As deep-water upwelling and CO2 absorption by surface waters is likely to increase as a result of human activities, we conclude that upper ocean regions where aragonite-shelled organisms are affected by dissolution are likely to expand.
    Keywords: Alkalinity, total; Animalia; Antarctic; Aragonite saturation state; Bicarbonate ion; Bottles or small containers/Aquaria (〈20 L); Calcification/Dissolution; Calcite saturation state; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Coulometric titration; Dissolution level; EXP; Experiment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Incubation duration; Laboratory experiment; Limacina helicina; Mollusca; OA-ICC; Ocean Acidification International Coordination Centre; Open ocean; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; Percentage; Percentage, standard deviation; pH; Phosphate; Polar; Potentiometric titration; Salinity; Scotia_OA; Silicate; Single species; Species; Station label; Temperature, water; Time point, descriptive; Zooplankton
    Type: Dataset
    Format: text/tab-separated-values, 904 data points
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    DATA PANGAEA
  • 3
    Electronic Resource
    Electronic Resource
    Race, Protest, and Public Space: Contextualizing Lefebvre in the U.S. City (1999)
    Boston, USA and Oxford, UK : Blackwell Publishers Inc.
    Antipode 31 (1999), S. 0 
    Details
    ISSN: 1467-8330
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography
    Notes: Since the early 1990s, Henri Lefebvre's theory of the social production of space has become widely used by Anglophone academics to understand contemporary urban processes in the Western world. This article argues that care must be taken in transporting Lefbevre's theoretical framework from one context to another. When applied in places like U.S. cities, it must be contextualized in relation to significant sociospatial processes, especially race. It is also argued that when the racialized geographies of U.S. cities are taken into account, Lefebvre's work—with its focus on the role representation plays in the production of space—aids our understanding of contemporary urban processes. The article develops this argument through an engagement with the racialized public spaces in and around downtown Lexington, Kentucky. The killing of an African-American teenager by a White police officer and the ensuing violence and commentary, especially two editorial cartoons, provide the opportunity to contextualize Lefebvre's theory. Furthermore, the case allows us to understand the role racialized representations of space play into the construction of urban geographies. The paper concludes by emphasizing the role of the body in Lefebvre's understanding of space and suggests that his twin notions of “the right to the city” and “the right to difference” hold out hope for the grassroots development of antiracist urban public spaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1467-8330.00098
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    WHAT CHIMERAS CAN TELL US ABOUT PLANT DEVELOPMENT (1996)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Plant Physiology and Plant Molecular Biology 47 (1996), S. 351-376 
    Details
    ISSN: 1040-2519
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Notes: Abstract The generation and analysis of plant chimeras and other genetic mosaics have been used to deduce patterns of cell division and cell fate during plant development and to demonstrate the existence of clonally distinct cell lineages in the shoot meristems of higher plants. Cells derived from these lineages do not have fixed developmental fates but rely on positional information to determine their patterns of division and differentiation. Chimeras with cells that differ genetically for specific developmental processes have been experimentally generated by a variety of methods. This review focuses on studies of intercellular interactions during plant development as well as of the coordination of cells during meristem function and organogenesis. Recent experiments combining mosaic analysis with molecular analysis of developmental mutants have begun to shed light on the nature of the signals involved in these processes and the mechanisms by which they are transmitted and received among cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.arplant.47.1.351
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  • 5
    Electronic Resource
    Electronic Resource
    Revisiting Lévy flight search patterns of wandering albatrosses, bumblebees and deer (2007)
    [s.l.] : Nature Publishing Group
    Nature 449 (2007), S. 1044-1048 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The study of animal foraging behaviour is of practical ecological importance, and exemplifies the wider scientific problem of optimizing search strategies. Lévy flights are random walks, the step lengths of which come from probability distributions with heavy power-law tails, such that ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature06199
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  • 6
    Electronic Resource
    Electronic Resource
    INTERFACING GIS WITH WATER RESOURCE MODELS: A STATE-OF-THE-ART REVIEW (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: Two distinctive, independently developed technologies, geographic information systems (GIS) and predictive water resource models, are being interfaced with varying degrees of sophistication in efforts to simultaneously examine spatial and temporal phenomena. Neither technology was initially developed to interact with the other, and as a result, multiple approaches to interface GIS with water resource models exist. Additionally, continued model enhancements and the development of graphical user interfaces (GUIs) have encouraged the development of application “suites” for evaluation and visualization of engineering problems. Currently, disparities in spatial scales, data accessibility, modeling software preferences, and computer resources availability prevent application of a universal interfacing approach. This paper provides a state-of-the-art critical review of current trends in interfacing GIS with predictive water resource models. Emphasis is placed on discussing limitations to efficient interfacing and potential future directions, including recommendations for overcoming many current challenges.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03813.x
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  • 7
    Electronic Resource
    Electronic Resource
    Scale and Translation Invariant Methods for Enhanced Time-Frequency Pattern Recognition (1998)
    Springer
    Multidimensional systems and signal processing 9 (1998), S. 465-473 
    Details
    ISSN: 1573-0824
    Keywords: time-frequency ; scale ; speech ; pattern recognition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Time-frequency (t-f) analysis has clearly reached a certain maturity. One can now often provide striking visual representations of the joint time-frequency energy representation of signals. However, it has been difficult to take advantage of this rich source of information concerning the signal, especially for multidimensional signals. Properly constructed time-frequency distributions enjoy many desirable properties. Attempts to incorporate t-f analysis results into pattern recognition schemes have not been notably successful to date. Aided by Cohen's scale transform one may construct representations from the t-f results which are highly useful in pattern classification. Such methods can produce two dimensional representations which are invariant to time-shift, frequency-shift and scale changes. In addition, two dimensional objects such as images can be represented in a like manner in a four dimensional form. Even so, remaining extraneous variations often defeat the pattern classification approach. This paper presents a method based on noise subspace concepts. The noise subspace enhancement allows one to separate the desired invariant forms from extraneous variations, yielding much improved classification results. Examples from sound classification are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008447517147
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  • 8
    Electronic Resource
    Electronic Resource
    Isotopes, Wool, and Rangeland Monitoring: Let the Sheep Do the Sampling (1998)
    Springer
    Environmental management 22 (1998), S. 145-152 
    Details
    ISSN: 1432-1009
    Keywords: KEY WORDS: Carbon isotope ratios; Vegetation change; Rangelands; Monitoring; Wool
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: 3 and C4 plant species consumed by animals. Sheep sample vegetation continuously throughout a year, and as their wool grows it integrates and stores information about their diet. In subtropical and tropical rangelands the majority of grass species are C4. Since sheep prefer to graze, and their wool is an isotopic record of their diet, we now have the potential to develop a high resolution index to the availability of grass from a sheep's perspective. Isotopic analyses of wool suggest a new direction for monitoring grazing and for the reconstruction of past vegetation changes, which will make a significant contribution to traditional rangeland ecology and management. It is recommended that isotopic and other analyses of wool be further developed for use in rangeland monitoring programs to provide valuable feedback for land managers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002679900091
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  • 9
    Electronic Resource
    Electronic Resource
    Methane emission measurements in urban areas in Eastern Germany (1996)
    Springer
    Journal of atmospheric chemistry 24 (1996), S. 121-140 
    Details
    ISSN: 1573-0662
    Keywords: tropospheric methane ; CH4 emissions ; natural gas ; tracers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract We have investigated methane emissions from urban sources in the former East Germany using innovative measurement techniques including a mobile real-time methane instrument and tracer release experiments. Anthropogenic and biogenic sources were studied with the emphasis on methane emissions from gas system sources, including urban distribution facilities and a production plant. Methane fluxes from pressure regulating stations ranged from 0.006 to 24. l/min. Emissions from diffuse sources in urban areas were also measured with concentration maps and whole city flux experiments. The area fluxes of the two towns studied were 0.37 and 1.9 μg/m2/s. The emissions from individual gas system stations and total town emissions of this study are comparable to results of similar sites examined in the United States.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00162407
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  • 10
    Electronic Resource
    Electronic Resource
    The US army in operations other than War: A time to revive military geography (1995)
    Springer
    GeoJournal 37 (1995), S. 201-208 
    Details
    ISSN: 1572-9893
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography
    Notes: Abstract This paper revisits and interrelates the scope of military geography and the changing role of the military, two themes previously addressed in the 1993 and 1994 special editions ofGeoJournal. I begin by tracing the evolution of military geography in the US from World War I through the end of the Gulf War to reveal the demise of the subfield within American academic geography. Within the context of the post-Cold War era, I describe the military's reorientation and emphasize the need and opportunity to broaden the scope of military geography accordingly. The military's current operating environment is best characterized by “operations other than war”, undertaken on an unprecedented scale. Military geographers and regional, systematic, and technical experts throughout the discipline now have an unparalleled opportunity to contribute to the success of peacekeeping, humanitarian, and disaster assistance missions with which the military is currently preoccupied. Initiatives by academic geographers would not only enhance mission accomplishment from the military and federal government's perspective, but might also help to revive military geography as a legitimate subfield by demonstrating that military geographic endeavors can be both “socially responsible” and “politically correct”, particularly within “operations other than war.”
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00816791
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