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  • Articles  (3)
  • Anabaena circinalis  (1)
  • Fusion energy development  (1)
  • Introduced species  (1)
  • Springer  (3)
  • Macmillian Magazines Ltd.
  • 2000-2004  (3)
  • 1935-1939
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Behavioral ecology and sociobiology 48 (2000), S. 61-68 
    ISSN: 1432-0762
    Keywords: Key words  Plethodon spp. ; Introduced species ; Territoriality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Behavioral interactions with native species may influence the invasiveness of introduced species. The salamanders Plethodon glutinosus and P. jordani in the eastern United States share many life history traits and demonstrate complex interspecific interactions that range geographically from competitive exclusion to sympatry. P. jordani was introduced to Mountain Lake Biological Station, Virginia, USA, between the years 1935 and 1945. We tested whether competition for space may influence the invasion of P. jordani into native P. glutinosus habitat by utilizing data from natural distributions, a field experiment, and controlled laboratory experiments. No environmental variables differed where P. glutinosus and P. jordani were collected in the field at the site of P. jordani introduction. In the field experiment, P. glutinosus was more fully exposed during foraging bouts in cages shared with heterospecifics as opposed to ones shared with conspecific salamanders. Condition (mass relative to body length) of salamanders at the end of the 3 months did not differ between conspecific and heterospecific treatments. In the laboratory, P. glutinosus most often attained the single burrow in the arena, but residency status had no effect. Species cohabited the burrow 50% of the time. Pair-wise encounters in the laboratory indicated that both species spend less than 20% of the time in aggressive behaviors as juveniles. Adults showed no behavior interpreted by us as aggression during pair-wise encounters.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-5117
    Keywords: cyanobacteria ; Anabaena circinalis ; akinetes ; germination ; wetland management ; Murray River
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Certain cyanobacteria, including the noxious bloom-forming species Anabaena circinalis Rabenhorst, produce thick-walled reproductive structures (akinetes) which may serve as a resting stage and ensure survival during adverse growth conditions. The effect of certain environmental variables (temperature, salinity and desiccation) on akinete germination of A. circinalis was investigated under laboratory conditions, to determine the conditions under which germination was inhibited. The overall aims were to provide a broader understanding of the life history and ecology of this species and to assess suppression of akinete germination as a potential management strategy for control of cyanobacterial blooms in the lower Murray River, Australia. The results indicated a marked threshold of temperature and salinity tolerance for germination of A. circinalis, but the latter was not within a range that could be successfully manipulated in a natural ecosystem. However, it was found that desiccation of akinetes for moderately short periods can significantly impair their capacity to germinate. It is, therefore, speculated that allowing periodic drying of shallow wetlands adjacent to the Murray River and in other areas may reduce the size of the inoculum for population growth by reducing viability of akinetes in surface sediments.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of fusion energy 19 (2000), S. 1-34 
    ISSN: 1572-9591
    Keywords: Fusion energy development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract This report has been prepared in response to a request from the U.S. Department of Energy's (DOE) Office of Fusion Energy Sciences to consider possible alternatives on reduced cost options for “next-step” devices. A central focus of next-step devices is the study of “burning” plasmas, which explore the impact of substantial fusion energy production via the deuterium-tritium reaction. An important part of the U.S. Fusion Energy Sciences Program is its participation in the International Thermonuclear Experimental Reactor (ITER) program. Taking into account the international situation and U.S. domestic issues, the ITER process is exploring reduced-cost options to the present ITER device. A Special Working Group, reporting to the ITER Council, has been formed to explore these issues on behalf of the ITER Parties, i.e., the European Union, Russian Federation, Japan, and the United States. This report and its related activities will aid the United States in the international process. This report is the result of a broad-based U.S. community effort to discuss, debate, and work together on the crucial issues involved in considering next-step options. The main content of this report is based on three potential pathways identified at a broadly attended community Forum for Next-Step Fusion Experiments (University of Wisconsin, Madison, April 1998) organized principally by the University Fusion Association and by the work of the ITER Steering Committee—US (ISCUS) on reduced cost ITER options. The Madison Workshop was followed by a smaller Workshop on Next-Step Options (University of California, San Diego, June 1998) to focus on preparing this report. A broadly-announced Website was established to facilitate access to documents related to this process.
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