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Effect of Light Wavelength on the Sexual and Asexual Reproduction of the Monogonont Rotifer Brachionus manjavacas

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Title: Effect of Light Wavelength on the Sexual and Asexual Reproduction of the Monogonont Rotifer Brachionus manjavacas
Other Titles: ワムシの生殖に与える光波長の影響
Authors: Kim, Hee-Jin / Suga, Koushirou / Hagiwara, Atsushi
Authors (alternative): 金, 禧珍 / 菅, 向志郎 / 萩原, 篤志
Issue Date: Sep-2013
Publisher: 日本水産増殖学会 / Japanese Society for Aquaculture Research
Citation: 水産増殖, 61(3), pp.261-268; 2013
Abstract: The monogonont rotifer Brachionus manjavacas (Australian strain) showed a steadily increasing population growth and larger number of resting egg production under continuous white light compared to under total darkness when they were batch cultured. By comparing different wavelength of light, such as white (control), 470 (blue), 525 (green) and 660 (red) nm, rotifers showed no significant differences in specific population growth rate, but sexual reproduction showed different patterns associated with light wavelengths. Although there were no significant differences with regard to mixis induction, the resting egg formation actively occurred at 525 nm. We further observed the movement of female rotifers to find the influential factor of different sexual reproduction. There was no significant difference in the mean swimming speed of 10 female rotifers, but the proportion of settling individuals varied with light wavelength. Under 525 nm light, no individuals continuously settled for one minute, while under other light wavelengths the percent of settling females for a minute ranged between 6.1±5.4 and 23.8±6.5%. The higher ratio of swimming females at 525 nm should enhance the male/female encounters, which resulted in higher resting egg formation. / シオミズツボワムシ複合種 Brachionus manjavacas (いわゆる L 型オーストラリア株、以下ワムシと略)を Tetraselmis 給餌によってバッチ培養したところ、暗黒下での培養よりも白色光の連続照射下で活発な個体群増殖と耐久卵形成を示した。次に、青 (470 nm)、緑 (525 nm)、赤 (660 nm)および白色光 (対照) の連続光照射下(約 1.4 W/m2)で培養し、個体群増殖率(r)、両性生殖誘導率、受精率、耐久卵数を求めた。異なる波長光の照射によってワムシの個体群増殖率と両性生殖誘導率に変化はなかったが、耐久卵形成は光波長 525 nm のとき最も活発に起こった。雌ワムシの遊泳速度は照射光波長にかかわらず一定だったが、付着行動を示す雌ワムシは光波長 660 nm のとき最も多くなった。一方、光波長 525 nm では付着個体が出現せず、全個体が遊泳した。光波長 525 nm のとき、雌ワムシの活発な遊泳行動によって、雄ワムシとの接触頻度が増大し、受精と耐久卵形成が促進された可能性がある。
Keywords: Brachionus manjavacas / Light wavelength / Reproduction / Behavior
URI: http://hdl.handle.net/10069/34261
ISSN: 03714217
Rights: © 2013 Japanese Society for Aquaculture Research
Type: Journal Article
Text Version: author
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/34261

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