고래의 귀지에서 밝혀진 사실들

고래의 귀지는 약 6개월마다 한층씩 쌓여 나무의 나이테처럼 귀지로 고래의 나이를 추정할 수 있다.

고래의 귀지에는 호르몬 정보가 쌓여 귀지를 분석하니
수컷은 10살 정도에 성적 성숙도가 제일 활발하고
암컷은 임신 횟수를 알 수 있었다고 한다.


또한 귀지에는 스트레스를 받으면 나오는 코르티솔 호르몬도 있는데
고래 20여 마리를 추적 관찰한 결과
포경이 가장 심했던 1960년대 코르티솔 분비량이 가장 높았고
포경이 중단된 1970년대에 급감했다.

그리고 짝짓기에 실패한 고래들 또한 코르티솔 농도가 높았다고 한다.
2 Comments

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