研究のタイプ: 医学/生物学の研究 (experimental study)

[獲物探索中のコウモリに対する電磁放射の悪影響:コウモリの風力タービンへの接近を妨げる可能性のある手段] med./bio.

The aversive effect of electromagnetic radiation on foraging bats: a possible means of discouraging bats from approaching wind turbines.

掲載誌: PLoS One 2009; 4 (7): e6246

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研究目的(著者による)

To test the hypothesis if an electromagnetic signal from a small portable radar can exert an aversive response in foraging bats and aerial insects.

詳細情報

The study was performed to test whether radiofrequency electromagnetic fields could be used as a method of preventing bats from death caused by collisions with wind turbines. From June to September 2007 bat activity was compared at 20 foraging sites in northeast Scotland during experimental trials (radar switched on) and control trials (no radar signal). The order of trials were alternated between nights.
From July to September 2008 aerial insects at 16 of these sites were also sampled.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1:
  • unspecified
Modulation type: pulsed
ばく露時間: continuous for 20 hr (bat activity) or 16 hr (insect count)
ばく露2:
  • unspecified
Modulation type: pulsed
ばく露時間: continuous for 20 hr (bat activity) or 16 hr (insect count)
ばく露3:
  • unspecified
Modulation type: pulsed
ばく露時間: continuous for 18 hr (bat activity) or 16 hr (insect count)

ばく露1

主たる特性
周波数
  • unspecified
タイプ
  • electromagnetic field
ばく露時間 continuous for 20 hr (bat activity) or 16 hr (insect count)
Modulation
Modulation type pulsed
Pulse width 0.08 µs
Duty cycle 1.68 %
Repetition frequency 2,100 Hz
ばく露装置
ばく露の発生源/構造
  • radar with a 1.2 m slotted waveguide array antenna
ばく露装置の詳細 antenna placed on a platform 2 m above ground level
パラメータ
測定量 種別 Method Mass 備考
電力 6 kW peak - - -
電界強度 5.58 V/m peak 測定値 - at a distance of 10 m
電界強度 5.11 V/m peak 測定値 - at a distance of 20 m
電界強度 3.79 V/m peak 測定値 - at a distance of 30 m

ばく露2

主たる特性
周波数
  • unspecified
タイプ
  • electromagnetic field
ばく露時間 continuous for 20 hr (bat activity) or 16 hr (insect count)
Modulation
Modulation type pulsed
Pulse width 0.08 µs
Duty cycle 1.68 %
Repetition frequency 2,100 Hz
ばく露装置
ばく露の発生源/構造
  • E1と同じ装置
ばく露装置の詳細 antenna placed on a platform 2 m above ground level and fixed so that the signal beam was directed towards the area of the highest bat activity
パラメータ
測定量 種別 Method Mass 備考
電力 6 kW peak - - -
電界強度 26.24 V/m peak 測定値 - at a distance of 10 m
電界強度 22.99 V/m peak 測定値 - at a distance of 20 m
電界強度 20.25 V/m peak 測定値 - at a distance of 30 m

ばく露3

主たる特性
周波数
  • unspecified
タイプ
  • electromagnetic field
ばく露時間 continuous for 18 hr (bat activity) or 16 hr (insect count)
Modulation
Modulation type pulsed
Pulse width 0.3 µs
Duty cycle 3.6 %
Repetition frequency 1,200 Hz
ばく露装置
ばく露の発生源/構造
  • radar with a 1.2 m slotted waveguide array antenna
ばく露装置の詳細 antenna placed on a platform 2 m above ground level
パラメータ
測定量 種別 Method Mass 備考
電力 6 kW peak - - -
電界強度 25.52 V/m peak 測定値 - at a distance of 10 m
電界強度 18.68 V/m peak 測定値 - at a distance of 20 m
電界強度 17.67 V/m peak 測定値 - at a distance of 30 m

ばく露を受けた生物:

方法 影響評価項目/測定パラメータ/方法

研究対象とした生物試料:
研究対象とした臓器系:
  • 感覚器
調査の時期:
  • ばく露中

研究の主なアウトカム(著者による)

Bat activity and foraging effort were significantly reduced during experimental trials when the radar antenna was fixed to produce an unidirectional signal therefore maximising exposure of foraging bats to the radar beam. However, although bat activity was significantly reduced during experimental trials, the radar had no significant effect on the abundance of insects captured by the traps.
However, although bat activity was significantly reduced substantial numbers of bats continued to forage within the radar beam. It is possible that only a particular combination of wavelength, pulse repetition rate and power output may provoke a reaction.

研究の種別:

研究助成

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