紀要論文 加速度計を用いたゴマフアザラシ(Phoca largha)の採餌行動の感知
Detection of Feeding Behavior of Spotted Seals Using Accelerometers
カソクドケイ ヲ モチイタ ゴマフアザラシ(Phoca largha) ノ サイエ コウドウ ノ カンチ

西本, 慧  ,  増渕, 隆仁  ,  高井, 英徳  ,  小林, 万里  ,  Satoru , Nishimoto  ,  Takahito , Masubuchi  ,  Hidenori , Takai  ,  Mari , Kobayashi  ,  東京農業大学生物産業学研究科アクアバイオ学専攻  ,  東京農業大学生物産業学研究科アクアバイオ学専攻  ,  稚内市立ノシャップ寒流水族館  ,  東京農業大学生物産業学研究科アクアバイオ学専攻、NPO法人北の海の動物センター  ,  Department of Aquatic Bioscience, Graduate school of Bioindustry, Tokyo University of Agriculture  ,  Department of Aquatic Bioscience, Graduate school of Bioindustry, Tokyo University of Agriculture  ,  Wakkanai Noshappu Aquarium  ,  Department of Aquatic Bioscience, Graduate school of Bioindustry, Tokyo University of Agriculture, NPO Marine Wildlife Center of JAPAN

62 ( 1 )  , pp.34 - 39 , 2017-06-22
NII書誌ID(NCID):AN00164184
内容記述
飼育下にて,成獣雌雄1頭ずつの下顎に2軸加速度計を装着し,イカナゴを1匹ずつ水面または水底へ給餌した。はじめに,水面給餌時における下顎の加速度波形を検出し,水面と水底給餌時の加速度波形の比較および個体による加速度波形の比較を行った。雌の水面給餌時の加速度波形から,水面では6m/s2以上で構成される高振幅の波形が0.5秒以内に再び出現する波形を採餌と定義した結果,40回中32回(80%)の検出に成功した。また,水面と水底給餌時の加速度値の平均値および各給餌回の振幅の最大値には有意な差があった。そのため,雌の水底加速度波形から当てはまりの良い加速度値を再度探索した。水底では,6.5m/s2以上で構成される高振幅の波形が0.5秒以内に再び出現する波形を採餌と定義した結果,19回中17回(89.5%)の検出に成功した。加速度値を高くすると一部,検出不能な給餌回も見られたことから,給餌位置が同じでも,餌のくわえ直しの有無や食べ方の違いによって加速度値が変化することが考えられた。
Experiments to detect feeding behavior of spotted seals were conducted at Wakkanai Noshappu Aquarium. Accelerometers were attached to a male and a female spotted seal on their lower mandibles and a sand lance was placed on the surface or bottom of the water to compare the accelerograms when they feed. Feeding behavior was defined as the accelerogram of high amplitude of 6 m/s2 wave reoccurring within the 0.5 second after the first wave form. Using this definition, the female seal feeding on the fish at the surface of the water was successfully detected 32 out of 40 times (80%). The maximum and the mean values of the accelerations were significantly higher when the seals were fed on the bottom of the water than on the surface. Therefore, different definition was given to the female seal feeding at the bottom by choosing the best fitted acceleration value from the accelerogram at this depth, and the movement with a high amplitude of 6.5 m/s2 wave reoccurred within the 0.5 second after the first one was defined as the seals eating on the bottom. Using this value, 17 out of 19 (89.5%) feeding activities were successfully detected. Even though the depth was the same, some feeding activities were undetectable when the acceleration threshold was set to high. This may be due to the changes in the acceleration value caused by different feeding methods and the movement of the seal changing the holding position of the fish in its mouth.
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