この研究は、電力線によって生じる電磁界（EMF）が、野生のシジュウカラ（Parus major）集団の繁殖特性に及ぼす影響の有無を調べるために、9つの繁殖期を通してデータを収集し、分析した。その結果、電磁界ばく露は、クラッチサイズ（一回の抱卵数）を7 %、卵の重量を3 %、有意に増加させた（クラッチ重量では10 %増加を意味する）；これは、隣接地域の参照群と比較して、EMFばく露を受けた親鳥による繁殖行動の増加を示す；このような変化に、ばく露群と参照群における生息地または親鳥の質の違いは無関係であった；一方、孵化の成功または最終的繁殖性（巣立ち及び繁殖の成功または巣立ち前のヒナの体重）において、両群の違いは検出されなかった、と報告している。
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To study the effects of electromagnetic fields generated by a power line on reproductive characteristics of a wild great tit population by analysing data gathered during nine breeding seasons.
Data was recorded on a wild great tit population breeding near Sagunto (Valencia, eastern Spain). The 110 ha study area was located within a homogeneous orange plantation. Wooden nest-boxes (125 x 117 mm bottom area) were placed each year in February in the same trees at about 50 cm above the ground (the height at which natural holes occur in this habitat). During the breeding seasons, nest-boxes were inspected at least once a week, and nests as frequently as necessary in order to accurately determine the reproductive parameters.
Nests were classified as exposed (> 0,01 µT; n=51) or non-exposed (≤ 0,01 µT; n=112)
|ばく露時間||continuous for approx. 40 days|
|ばく露装置の詳細||the power line crossed the study area at ca. 11.3 m above the ground; nests and nest-boxes were located 50 cm above the ground|
The electromagnetic field exposure significantly increased the clutch size (7%) and the egg volume (3%), implying a 10% increase in clutch volume. This indicates an increase in reproductive investment from parent birds exposed to electromagnetic fields as compared to the control group in the adjacent reference area. These results cannot be attributed to habitat or quality differences of the adults in the exposed group and control group. Nevertheless, no differences in hatching success or final productivity (fledging and reproductive success or nestling body mass) could be detected in exposed animals.
The study indicates that electromagnetic fields generated by power lines can have biological consequences in wild organisms living close to them.