Distinction of individual Northern fur seal pups.Callorhinus ursinus, through their call

概要

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The calls of six northern fur seal pups, Callorhinus ursinus, transported from Robben Island to Mito Sea Paradise were analized. The calls of northern fur seal pups consist of a short one of a few-tenths of a second and a shriek type of 1-2 seconds or longer. They have frequency components which range from a few-tens Hertz to eight kilo-Hertz. Each call consists of a clear main peak frequency and a sub-main peak frequency. The call of each pup has a characteristic structure which hardly changes according to the physiological condition. It is considered that a mother seal distinguishes the call of the pup and uses it as the first clue to find her pup.ロベン島で捕獲され,三津シーパラダイスに搬入されたオットセイ仔獣6頭の発生音を解析した.オットセイ仔獣の発生音は1秒の数分の1の短いものと,1～2秒,時には数秒持続する大きなワメキ音で,数十Hzから8kHz以上にも達する周波数成分より成る.各発生音は顕著な主極大周波数と副極大周波数より成る.各仔獣の発生音は各々特徴的な構造を有し,発音時の生理的状態によって大きく変わることはない.母獣はこれらの発生音を識別して,自己の仔獣を発見する最初の手掛りとしていると考えられる.
長崎大学水産学部の論文
1983-02-00