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  • Articles: DFG German National Licenses  (2)
  • 1995-1999  (2)
  • Fecundity  (1)
  • Japan  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The effect of rainwater infiltration within a slope of pyroclastic deposits, recorded using automated electric prospecting (1998)
    Springer
    Bulletin of engineering geology and the environment 57 (1998), S. 51-58 
    Details
    ISSN: 1435-9537
    Keywords: Key words Slope failure ; Rainfall ; Resistivity ; Electric prospecting ; Pyroclastic deposits ; Japan
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Resumé Dans une région soumise à la mousson, l'infiltration des eaux de pluie dans un talus est l'un des facteurs déterminants de sa stabilité. Pour comprendre le processus d'infiltration, on a utilisé une méthode automatisée de prospection électrique pour mesurer les modifications de la résistivité apparente à l'intérieur d'un talus, situé dans le sud de Kyushu, au Japon. La formation concernée est constituée de débris pyroclastiques quaternaires faiblement consolidés et perméables. Les mesures de résistivité effectuées sur une durée de six mois on mis en évidence les variations dans le talus, et en particulier un décalage marqué entre la chute de pluie et la modification de résistivité. Près de la surface, la réponsc est rapide et importante. A des profondeurs plus grandes, elle est plus lente et plus faible, mais les effets peuvent être cumulatifs.
    Notes: Abstract  Rainfall and its infiltration into a slope is one of the most important factors affecting slope stability in a monsoon region. To understand the infiltration process, changes in the apparent resistivity within a slope in southern Kyushu, Japan, have been measured using automated electric prospecting. The slope studied is underlain by Quaternary weak and permeable pyroclastic flow deposits. Resistivity data obtained over a six month period indicate that the conditions within the slope vary and a distinct time lag is recognised between the rainfall event and the change in resistivity. At near surface depths the response is rapid and large. At lower depths it is slower and smaller, but the effects may be cumulative.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100640050020
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Density-dependent growth and reproduction of the apple snail, Pomacea canaliculata: a density manipulation experiment in a paddy field (1999)
    Springer
    Population ecology 41 (1999), S. 253-262 
    Details
    ISSN: 1437-5613
    Keywords: Key words Body size ; Density effect ; Fecundity ; Population dynamics ; Rice pest ; Survival rate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract To examine density dependence in the survival, growth, and reproduction of Pomacea canaliculata, we conducted an experiment in which snail densities were manipulated in a paddy field. We released paint-marked snails of 15–20 mm shell height into 12 enclosures (pens) of 16 m2 at one of five densities – 8, 16, 32, 64, or 128 snails per pen. The survival rate of released snails was 95% and was independent of snail density. The snail density had a significant effect on the growth and egg production of individual snails. This density dependence may have been caused by reduced food availability. The females at high density deposited fewer and smaller egg masses than those at low density, and consequently produced fewer eggs. The females at densities 8 and 16 deposited more than 3000 eggs per female, while the females at density 128 oviposited only 414 eggs. The total egg production per pen was, however, higher at higher snail density. The survival rates of juvenile snails were 21%–37% and were independent of adult density. The juvenile density was positively correlated with the total egg production per pen and hence was higher at higher adult density. However, the density of juveniles larger than 5 mm in shell height, i.e., juveniles that can survive an overwintering period, was not significantly different among density treatments. These results suggest that snail density after the overwintering period is independent of the density in the previous year. Thus, density dependence in growth and reproduction might regulate the population of P. canaliculata in paddies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s101440050029
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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