この研究は、2種のゴミムシダマシ（コメノゴミムシダマシおよびチャイロコメノゴミムシダマシ）の蛹に静磁界（50 mT）ばく露を与え、その後成虫になるのに要する発育期間と成虫の運動能を調べた。静磁界ばく露は、円筒形永久磁石を鉛直に置き、そのN極またはS極の直上で均一に50mTが発生しているエリアにシャーレを置き、その中に蛹を入れておこなった。対照群は磁石から5m離れた位置にシャーレを置いた。蛹は成虫に羽化するまでばく露を継続し、その発育を毎日観察した。その結果、2種とも、蛹から羽化までの期間にN極群、S極群、対照群に差は無かった；コメノゴミムシダマシの成虫の運動能に、3群で有意差はなかった；チャイロコメノゴミムシダマシの運動能の変化はN極群、S極群で反対であった、などの所見を報告している。
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To examine the influence of a static magnetic field on the development from the pupae to the adult and motor behaviour in two mealworm beetle species.
As a consequence of intensive industrialization, artificial magnetic fields are common in the living environment. This study should contribute to a better understanding of the sepecies-specific responses in variable environmental conditions.
The pupae (0-24 hours old) were randomly divided into three groups: 1.) control group (Tenebrio obscurus (n=8), Tenebrio molitor (n=12)), 5 m distance from the magnet; 2.) exposure close to the north pole of the magnet (N-group) (T. obscurus (n=6), T. molitor (n=11)) and 3.) exposure close to the south pole of the magnet (S-group) (T. obscurus (n=8), T. molitor (n=11)). The pupa-adult development was recorded daily.
After eclosion, every single insect was put into a dish containing food and then returned to the north or south magnetic pole for another 24 hours. Afterwards, the beetles were placed into a petri dish where its behavior was recorded for 15 minutes.
| ばく露 | パラメータ |
|---|---|
ばく露1:
ばく露時間:
during development from pupa to eclosion and 24 h after eclosion
|
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Pupae were divided into the following three groups: i) control (kept at a distance of 5 m from the magnet) ii) nearer to the magnetic south pole iii) nearer to the magnetic north pole
| 周波数 |
|
|---|---|
| タイプ |
|
| ばく露時間 | during development from pupa to eclosion and 24 h after eclosion |
| ばく露の発生源／構造 |
|
|---|---|
| Distance between exposed object and exposure source | 2 mm |
| ばく露装置の詳細 | 37 mm high cylindrical magnet with a diameter of 45 mm positioned above the cell plate dish; pupae placed into the cell plate dish with the head towards the magnetic pole (head 2 mm from the magnetic pole) |
| 測定量 | 値 | 種別 | Method | Mass | 備考 |
|---|---|---|---|---|---|
| 磁束密度 | 50 mT | - | 測定値 | - | ± 5 mT |
No significant differences in the pupae-adult development were found among the groups.
Regarding the locomotor activity, no significant changes in the behavior of T. obscurus were observed between the S-group, the N-group and the control group. However, significant changes in the locomotor activity of T. molitor occurred when compared to the control: In the N-group, the covered distance and the average speed increased while the immobility time decreased. In the S-group, the covered distance was decreased.
The authors conclude that a static magnetic field (50 mT) could be considered as a possible stress factor that does not have any influence on pupa-adult development dynamic, but could induce changes in the locomotor activity of T. molitor .
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