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Overfishing Whales and the Environment
過度捕鯨與環(huán)境
Until recently, when scientists studied changes in open-ocean ecosystems,
直到最近，當(dāng)科學(xué)家們?cè)谘芯块_放海洋生態(tài)系統(tǒng)的變化時(shí)，
they looked at changes in the bottom of the food chain that gradually make their way to the top, like food shortages and shifts in the ocean environment.
他們觀察了位于食物鏈最底層且不斷上升的生物的變化，例如食物短缺、海洋環(huán)境變化。
A recent study, however, suggests that more attention needs to be given to top-down influences as well.
然而，最近一項(xiàng)調(diào)查顯示，人們還應(yīng)該更加關(guān)注（食物鏈）自上而下的影響。
For example, over the past few decades, there's been a major collapse of the populations of harbor seals, fur seals, sea lions, and sea otters living on the coasts of western Alaska.
例如，在過去的幾十年里，生活在阿拉斯加西海岸的斑海豹、海狗、海獅和海獺數(shù)量銳減。
Now a new study suggests that all this destruction can be traced back to humans overfishing sperm and baleen whales between 1946 and 1979.
現(xiàn)在，一項(xiàng)新的調(diào)查顯示，所有的這些毀壞皆可歸咎于人類在1946年到1979年間過度捕撈抹香鯨和須鯨。
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