Keystone species
01
キーストーン種, 基盤種
a plant or animal that plays a very important role in keeping the balance of its environment, and if it disappears, many other living things can be affected
例
Sea otters are a keystone species because they help control sea urchin numbers.
ラッコはキーストーン種です、なぜなら彼らはウニの数を制御するのに役立つからです。
