この研究は、ショウジョウバエの単一雌(IF)系統5種類の適応度成分および運動活動度に対する超低周波磁界(ELF)の影響を調べた。5つのIF系統は、ミトコンドリアDNA変異性に基づいて遺伝的構造が決定されたものである。各系統の卵—第1齢幼虫および1日齢ハエにELF(50Hz、0.5mT)の48時間ばく露を与え、ばく露後のオープンフィルド試験で、雌雄別に、適応度成分および運動活動度を測定した。その結果、卵—第1齢幼虫へのばく露の場合、発生時間が短縮したが、生存率および性比への影響は見られなかった;1日齢の雌雄のハエへのばく露の場合、いくつかのIF系統では、雄よりも雌において、運動活動量が有意に低下し、その影響が長時間継続した、と報告している。
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The effects of exposure to a 50 Hz magnetic field on development and motor activity Drosophila subobscura at various developmental stages should be investigated.
Five strains of the fruit fly Drosophila subobscura (named B16/1, B24/4, B39/1, B57/2 and B69/5) were prepared with each strain derived from a single pair of flies (isofemale strains) and defined via mitochondrial DNA variability. The flies were exposed either in egg-first instar larval stage (group 1, number not mentioned) or as 1-day-old adult animals (group 2, n=30). For each exposure group, a control group without any treatment and a sham exposure group (n=30 each for adult animals, no number stated for larvae) were examined in the same developmental stages.
ばく露 | パラメータ |
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ばく露1: 50 Hz |
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周波数 | 50 Hz |
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タイプ |
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ばく露の発生源/構造 |
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Sham exposure | A sham exposure was conducted. |
測定量 | 値 | 種別 | Method | Mass | 備考 |
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磁束密度 | 0.5 mT | - | 測定値 | - | - |
No significant differences were found between the sham exposure and untreated control groups, so they were pooled and used as one control group, respectively.
Exposure of egg-first instar larvae (group 1) to the magnetic field resulted in a significantly shortened developmental time in all strains compared to the control group but did not affect viability or sex ratio.
Exposure of 1-day-old male and female adults (group 2) to the magnetic field significantly decreased the motor activity compared to the control group in the strains B16/1 and B24/4 and this effect lasted longer in females than males.
The authors conclude that exposure to a 50 Hz magnetic field might have different effects on development and motor activity of Drosophila subobscura at various developmental stages depending on their genetic background.
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