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  • Articles  (3)
  • Anabaena circinalis  (1)
  • Introduced species  (1)
  • JEL Classification: L81, R41, R52  (1)
  • Springer  (3)
  • Macmillian Magazines Ltd.
  • 2000-2004  (3)
  • 1935-1939
  • 1
    Electronic Resource
    Electronic Resource
    Spatial and behavioral interactions between a native and introduced salamander species (2000)
    Springer
    Behavioral ecology and sociobiology 48 (2000), S. 61-68 
    Details
    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
    URL: http://dx.doi.org/10.1007/s002650000207
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  • 2
    Electronic Resource
    Electronic Resource
    Environmental influences on akinete germination of Anabaena circinalis and implications for management of cyanobacterial blooms (2000)
    Springer
    Hydrobiologia 427 (2000), S. 65-73 
    Details
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003988426561
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  • 3
    Electronic Resource
    Electronic Resource
    Towards a dynamic aggregate shopping model and its application to retail trading hour and market area analysis (2000)
    Springer
    Papers in regional science 79 (2000), S. 413-434 
    Details
    ISSN: 1435-5957
    Keywords: JEL Classification: L81, R41, R52 ; Key words: Retail modelling, retail change, trading hours, consumer behaviour, market area analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Economics
    Notes: Abstract. The supermarket equation is a differential equation peculiar to spatial science. The complex form of this equation is presented here and is used to study aggregate consumer shopping patterns. The focus is the relationship between trips to, and shopping within, planned shopping centres relative to retail trading hour boundaries. In this context, five malls in Sydney are studied in the period prior to the introduction of deregulated shopping hours in 1992. The space-time convergence of aggregate consumer behaviour at these retail nodes show that the gravity coefficient can be treated in a temporal context. Estimates of mean trading hours can be made from the general solution and these are compared to alternative estimates from Fourier analysis. Time corrections to the gravity coefficient allow for a dynamic market area analysis, where the primary trade area can be determined relative to the trading hours of the shopping centre. A Sydney example shows how this methodology can be applied with population census data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00011485
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