An evaluation of the use of automatic infrared sensor cameras for ecological research of terrestrial small mammals

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  • 地表棲小型哺乳類生態調査への自動撮影センサーカメラ使用法の検討
  • チヒョウセイコガタホニュウルイ セイタイ チョウサ エ ノ ジドウ サツエイ センサーカメラ シヨウホウ ノ ケントウ

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Abstract

We evaluated the use of automatic infrared sensor cameras for ecological research on terrestrial small mammals with correct species identification. First, we constructed the best system by: (1) photographing vertically using a tripod and a mesh mat (10-mm squares) as a scale, (2) using a bait basket set on the mesh mat to induce them to come and stay for a long time (over 24 hours at least), and (3) photographing in 1-min intervals to preserve camera batteries for sustained periods of time. Second, we set up this system on forest floors and obtained pictures of four mammals. Of them, Urotrichus talpoides and Rattus norvegicus were easily identified based on external characteristics. However, identification of Apodemus speciosus and A. argenteus were difficult because of their external similarity. Their heads were clearly photographed and eye diameter and the maximum and minimum widths between both eyes were measured. The width difference between the innermost and the outermost edges of both eyes, and eye diameter, were useful in identifying both species. Third, the daily activity of A. speciosus was researched monthly at a locality. We ascertained that A. speciosus was nocturnal throughout the year.

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