シオミズツボワムシにおける受精卵形成時の水温とふ化ストレインの両性生殖パタ-ンの関係〔英文〕

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Temperature given at the time of fertilized (resting) egg formation in the rotifer Brachionus plicatilis was discussed, from a point of view that it may cause great difference in bisexual reproductivity among the deriving strains. Fertilized eggs were produced at five temperatures (17, 20, 25, 27 and 30°C) in sea water. Neonates from the eggs were employed as stem mothers of respective experimental strains. Every strain consisted of isogenic individuals through keeping parthenogenesis, which was ensured by the individual culture in 0.1ml sea-water medium. Media were renewed at regular intervals of 12, 24 or 36 hours at 30, 25 or 20°C respectively in order to prevent the accumulation of metabolites which is an exciting cause of bisexual reproduction.The temperature given in the process of fertilized egg formation determines the bisexual reproduction pattern of deriving strains. Among the strains derived from the fertilized eggs which were produced at high temperature over 25°C, the appearance rate of mictic females has no relation to temperature. Among those, however, derived from the eggs originating in low temperature below 25°C, it varies inversely with temperature below 25°C, but not affected above 25°C.
社団法人日本水産学会の論文