与海洋生境不同的是，淡水生境的环境条件变化很大。
The environmental conditions of freshwater habitats, unlike those of ocean habitats, are highly variable.
如今的绿藻大多生活在淡水水域中，这一点说明它们的早期进化史可能起源于淡水生境。
Today green algae live mainly in freshwater, suggesting that their early evolutionary history may have occurred in freshwater habitats.
他认为观察到的这些昆虫捕食爬行动物的现象引发了对之前所持对淡水生境中捕食动态观点的疑问。
He suggests that these observations of bugs predating reptiles call into question previously held opinions about predator-prey dynamics in freshwater habitats.
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