Life Cycle of Paramecium bursaria Syngen 1 in a Natural Pond
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概要
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Studies were made on the natural population density of paramecium bursaria syngen 1, on the life cycle stages to which the individuals belonged, and on the length of the immature and adolescent periods. Green paramecia were collected from a natural pond once every 20 days for two years : 3176 individuals on 37 collection dates. Individuals in nature did not maintain a steady density, but a regular annual change in the population density was not found. Mating tests were conducted on 2955 of 3176 individuals. Of the total, 23(1%) were adolescent, 21(1%) were mature, while the others showed no mating reaction. 73 of 315 individuals from two other collections died within two weeks after undergoing 0 to 9 cell divisions. 178 of the other 242 stocks showed fission rates under 1.00. Only 2 stocks showed a rate of over 1.51. Further, 121 of 242 stocks died without expressing mating ability within 4 months after collection. The other stocks lowered their fission rates gradually and often produced abnormal or colorless individuals within stocks instead of expressing mating reactivity. Immature clones from a cross between two stocks originating from the same pond showed fission rates of 1.51 to 2.25. The clones grew to maturity after 38 to 59 cell divisions from clone initiation following an immature period of 36 to 58 cell divisions and an adolescent period of 0 to 17 cell divisions, during which no individuals with abnormal morphology appeared. These results indicate that the natural population in this pond consisted primarily of senile individuals.
- 社団法人日本動物学会の論文
- 1994-08-15
著者
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KOSAKA Toshikazu
Department of Biological Science, Faculty of Science, Hiroshima University
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Kosaka Toshikazu
Graduate School of Biological Science, Hiroshima University
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Kosaka T
Graduate School Of Biological Science Hiroshima University
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Kosaka Toshikazu
Department Of Biological Science Graduate School Of Science Hiroshima University
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