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<p>We evaluated the relationship between the activity location of Japanese house bats (<i>Pipistrellus abramus</i>) and environmental factors, including traffic and artificial light, in an urban landscape. From August to October 2020, we recorded the flight activity of Japanese house bats using bat detectors at 120 randomly selected sites in Tsuruoka City, northeastern Japan. We conducted a generalized additive model (GAM) to analyze the relationship between the bat activity and environmental factors (distance from the water body, NDVI, sound pressure, and illuminance intensity). The GAM results showed that the bats are most active close to the water body. The response curve for NDVI showed that bat activity increased as the NDVI value increased. Sound pressure levels exceeding approximately 50 dB tended to reduce the bats’ activity. As for illuminance intensity, there was a peak of activity at 15–20&#xa0;lux, and when the illuminance intensity exceeded about 20&#xa0;lux, the activity of bats tended to decrease with increasing illuminance intensity. These results suggest that Japanese house bats selected the location near the water body with a greater amount of vegetation as the activity site and adapted to the urban environment by avoiding or utilizing human disturbance. This indicates that the Japanese house bats do not use the entire urban landscape evenly, and they have selectivity for various local-environmental factors within the landscape.</p>

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Environmental factors including traffic and artificial light affecting the flight activity of Japanese house bats (Pipistrellus abramus) in an urban landscape, northeastern Japan

  • 期刊论文

  • 发表日期：

    2026年6月22日

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  • Kota Ono,
  • Masayuki U. Saito

摘要

We evaluated the relationship between the activity location of Japanese house bats (Pipistrellus abramus) and environmental factors, including traffic and artificial light, in an urban landscape. From August to October 2020, we recorded the flight activity of Japanese house bats using bat detectors at 120 randomly selected sites in Tsuruoka City, northeastern Japan. We conducted a generalized additive model (GAM) to analyze the relationship between the bat activity and environmental factors (distance from the water body, NDVI, sound pressure, and illuminance intensity). The GAM results showed that the bats are most active close to the water body. The response curve for NDVI showed that bat activity increased as the NDVI value increased. Sound pressure levels exceeding approximately 50 dB tended to reduce the bats’ activity. As for illuminance intensity, there was a peak of activity at 15–20 lux, and when the illuminance intensity exceeded about 20 lux, the activity of bats tended to decrease with increasing illuminance intensity. These results suggest that Japanese house bats selected the location near the water body with a greater amount of vegetation as the activity site and adapted to the urban environment by avoiding or utilizing human disturbance. This indicates that the Japanese house bats do not use the entire urban landscape evenly, and they have selectivity for various local-environmental factors within the landscape.