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(역동적인 음악)

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키스톤은 원래

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돌로 된 아치 위에 있는 
쐐기 모양 판을 뜻한다

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너가 키스톤을 제거한다면, 너는 모든 것들이 무너지는 위험을 겪을 수 있다

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그리고 몇몇의 생태계도 하나의 키스톤 종에 의해 동일한 방식으로 작동한다

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생물학에서 키스톤 종들은

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그들의 크기나 수에 비추어볼때

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그들의 서식지에 불균형적으로 큰 영향을 준다

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그들의 평상시 활동들은 직접적이든 간접적이든

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다른 모든 종들에게 영향을 준다

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그리고 그들의 개체수 변화는 영양 종속을 유발할수 있다

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자주 놀라운 방식으로

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와이오밍주에 있는 옐로스톤 국립공원의 회색늑대를 봐라

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주로 사냥 때문에, 1930년대 초쯤에 그들의 개체수는 0으로 떨어졌다

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하지만 1995년에, 늑대들은 공원에 다시 들어왔고,

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늑대의 영향은 그 이후로 계속 관찰되었다

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그 영향을 들어내는 것은 매우 중요하다

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늑대의 부재와 reintroduction은

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옐로스톤을 대규모로 자주 놀라운 방식으로 바꿨다

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강물이 흐르는 방식까지

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하나는, 늑대가 엘크를 잡아먹고,엘크가 그것을 안다는 것이다

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그래서 늑대가 엘크의 영역에 있을때 그들의 행동은 바뀐다

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엘크는 보통 풀을 먹으면서 유목생활을 한다

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하지만 근처에 늑대가 존재하지 않자,
엘크들은 방심하게 되었다

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한 곳에 정착해서
많은 먹이를 먹는 것을 택했다

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