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Invertebrates dominate these upper reaches.
無脊椎動物統治著上游河段
The hellgrammite, its body flattened to reduce drag,
這是魚蛉，其扁平的身體能減少水的沖擊力
has bushy gills to extract oxygen from the current.
并依靠濃密的鰓從水中過濾氧氣
Black fly larvae anchor themselves with a ring of hooks.
蚋的幼蟲靠鉤環固定自己
But if these become unstuck, they're still held by a silken safety line.
即使不小心松脫了，它們還有一根堅韌的“安全索”
There are advantages to life in the fast stream.
這些動物擁有在急流中生存的先天優勢
Bamboo shrimps can just sit and sift out passing particles with their fan-like forearms.
擬匙指蝦只需趴在河底，用它們的扇形前臂從流水中過濾出食物顆粒
Usually these mountain streams only provide enough food for small animals to survive,
通常，山澗提供的食物只能維持小型動物生存
but with the spring melt here in japan, monsters stir in their dens.
可是在日本，每當春雪消融之際，一種怪物便在巢窟中蘇醒。
