Bat ecology in crevices of elevated railways of the Kyushu-Shinkansen train in Yatsushiro City, Japan, with special reference to usage of artificial roosts and foraging habits in the Oriental free-tailed bat <i>Tadarida insignis</i>

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  • 九州新幹線高架橋で発見されたコウモリ類の生態，特にオヒキコウモリ<i>Tadarida insignis</i>の人工ねぐらの利用と食性について
  • 九州新幹線高架橋で発見されたコウモリ類の生態,特にオヒキコウモリTadarida insignisの人工ねぐらの利用と食性について
  • キュウシュウ シンカンセン コウカキョウ デ ハッケン サレタ コウモリルイ ノ セイタイ,トクニ オヒキコウモリ Tadarida insignis ノ ジンコウネグ ラ ノ リヨウ ト ショクセイ ニ ツイテ

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Abstract

<p>We observed the three bat species Tadarida insignis, Pipistrellus abramus, and Vespertilio sinensis at joint surfaces of a railway viaduct of the Kyushu-Shinkansen train in Yatsushiro City. In addition, one echolocation call was recorded, which is characterized by 36 kHz (peak frequency) on average, and differs from that of other species that occur in the Kyushu District. Dense clusters of hibernation colonies of T. insignis were observed for the first time. A V. sinensis colony was also observed first in Kumamoto Prefecture. T. insignis and P. abramus formed maternity colonies in July. The slits of the hibernating site were narrow, with a width of about 3 cm. The population size of T. insignis peaked once in May and once in October, whereas that of P. abramus peaked only in September. Emergence time of the first bat was about 22 minutes after sunset in P. abramus, and 36 minutes after sunset in T. insignis. T. insignis fed mainly on Lepidoptera, Hemiptera, Diptera, Neuroptera, Coleoptera, and Odanata, and the respective proportion fluctuated seasonally; agricultural pests were also included in the diet. Surveying structures such as viaducts is thus useful to assess occurrence and biology of different bat species.</p>

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