シオミズツボワムシの両性生殖と飼育水塩素量の関係〔英文〕

概要

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Bisexual reproduction of the rotifer Brachionus plicatilis was investigated at three different chlorinity levels. Special attention was given to the origin of the strains examined.Strains were isolated by hatching fertilized eggs produced at chlorinities of 4 and 16‰. All rotifers were cultured individually throughout the experiment in 4, 8 and 16‰. The appearance rate of mictic females was used as an indicator of bisexual reproduction activities. Culture media of 4 and 8‰ were changed every 12 or 18 h, while 16‰ cultures were changed every 24 and 30 h.The bisexual reproduction rate in the strains originating from 4‰ varied markedly depending on the chlorinity of the culture. At chlorinities of 4, 8 and 16‰, the bisexual reproduction rates were 33, 18 and 6%, respectively. Conversely, in strains originated at 16‰, no correlation was found between the bisexual reproduction rate and the culture chlorinity.Differences in the pattern of response between L- and S-type B. plicatilis were inferred as the result of adaptation to environmental factors such as temperature or chlorinity.
日本水産學會の論文