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Kazuyuki Fujita 《Researches on Population Ecology》1984,26(2):379-388
Summary I propose a new method for anlysing predatorprey interactive systems in discontinuous environments. The basic index used here
is a generalized version ofLloyd's (1967) “interspecies mean crowding”, which is defined as the number of individuals of one species existing in a given patch
per that of the other species in either the same or different patches at either the same or different times. Four indices
are derived from different combinations of the numbers of the prey and the predator in habitat patches. Then, the correlation
coefficients between the numbers of individuals in patches in both different locations and times are derived by modifying
the above new indices. Using this technique, dynamical changes of the joint distributions of the numbers of predators and
prey which reflect variation in local conditions, can readily be described. As an example, this method was applied to an analysis
of the outcomes of a multi-patch version of theLotka-Volterra model of predator-prey interactions. 相似文献
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本文探讨了1990年以来东京大城市圈空间扩展与变迁以及全球化对东京的影响。全球化对城市空间的重构有很大影响,经济全球化背景下,资本流动、劳动力转移、产业结构变化等因素是影响城市空间重构的主要要素。因此,需要从全球化的视角审视城市发展。 相似文献
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Education reform and education politics in Japan 总被引:1,自引:0,他引:1
Hidenori Fujita 《The American Sociologist》2000,31(3):42-57
Since the 1980s, a new tide of education reform movements has emerged in many countries, including the United States and Japan,
along with the rise of a consumer orientation and national concern over the quality of schooling. This has made parental choice
into a major policy issue, along with accountability and independent control. Four forms of symbiosis are identified: embracive,
segregated, civic and market-oriented. This article discusses the nature of current reforms, and argues that they place Japanese
education at a threefold critical crossroads or in a state of crisis. 相似文献
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Previous research has found a link between economic development and post-materialist and libertarian values. This research examines social change in values in Japan from the mid-1970s to the beginning of the 21st century. Using Japanese survey data, we investigate the nature and pace of social change during the economic crisis of the early 1990s, as well as in the periods before and after the burst of the bubble economy. We find that social change stalled during the economic crisis and resumed again in the late 1990s, but at a much lower level than in the late 1980s. We argue that economic period effects are largely responsible for the slowdown in social change in values in Japan at the end of the 20th century. 相似文献
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Male and female encoding-decoding of spontaneous and enacted nonverbal affective behavior was evaluated using the Buck (1977) slide-viewing paradigm. The eliciting stimuli were carefully selected and evaluated to insure a comparable emotional impact on both sexes, and all subjects received the same decoding task. Consistent with previous research, females were superior decoders overall. Also as predicted, females were superior encoders, principally when reacting spontaneously to the slides. Given no evidence of differential affective arousal, this sex difference for spontaneous encoding is interpreted to reflect differences in male-female display rules. Contrary to several previous findings spontaneous and enacted encoding measures were not strongly related, especially for males, where display rules may modify their spontaneous and enacted expressive behavior in comparison to females. There was no consistent positive or negative relationship between dimensional or category measures of encoding-decoding for either sex. Future investigations should separately evaluate encoding-decoding phenomena for each sex, employing more precise methods to evaluate the specific nonverbal behaviors actually important to the encoding-decoding communication process. 相似文献
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Kazuyuki Fujita Koji Hirano Michiharu Kawanishi Naota Ohsaki Makoto Ohtaishi Eizi Yano Makoto Yasuda 《Researches on Population Ecology》1978,19(2):209-221
Summary Adult population of a dragonflyNannophya pygmaea
Ramber inhabited in a damp ground was investigated with mark-and-recapture method in 1975. The following results about the seasonal
changes of the population size and distribution in the habitat were obtained.
Adults emerged from late May to mid August. The number of the adults was most abundant in early June, but that of matured
males in early July. From the recapture data, the estimate of daily survival rate was 0.82, and the length of immature stage
in males was estimated as 5 days or so. Total number of post-teneral adults emerged in the habitat was estimated as about
9,000. The mean crowding-mean density regression method was applied for the analysis of the distribution pattern of the adults.
Matured males showed a spaced-out distribution, while females and immatured males distributed themselves rather aggregatively.
Such a distribution pattern of the matured male would be attributed to their territorial behaviour. The territorial behaviour
was considered to force the matured males to extend the distribution area in July when they were most abundant.
From the above-mentioned results and some observations, the meaning of the territoriality in this species was discussed. 相似文献
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Kazuyuki Fujita 《Researches on Population Ecology》1983,25(2):387-399
Summary An acarine predator-prey system in a circular stepping-stone environment was described with a simulation model to elucidate
the factors responsible for persistence of the system. The main assumptions in this model are: (1) The prey are inevitably
eliminated in patches in which predators exist. (2) The density of prey declines and becomes extinct by plant defoliation
due to feeding by prey. In this regard this model is different from the models which mimickedHuffaker's (1958) experiments and assumed stable plant-prey relations.
Analyses showed that the critical factor in persistence of the predator-prey system was the plant-prey relations, at any combination
of other parameters involved in the model. The predator-prey system did not persist long under the unstable relationship of
prey and plant. Otherwise the system persisted longer especially when I used a larger number of patches, a larger amount of
plant in each patch, and long-distance-migrations of the prey. In particular, frequent emigration of the prey regardless of
plant conditions was most effective. 相似文献