Creating the reservoir also destroyed communities like St. Thomas and devastated the Colorado River ecosystem.

建造这个水库也摧毁了圣汤玛斯等社区，也让科罗拉多河的生态系统受到破坏。

Salmon and the river ecosystem have become threatened by a host of problems originating far up river.

三文鱼和河流生态系统已经受到来自河流上游的一系列问题的威胁。

But it isn't just animals like the sturgeon that are in trouble, the entire Yangtze River ecosystem is being poisoned.

但是陷入困境的不仅仅是像长江鲟这样的动物，整个长江流域的生态系统都遭到毒害。

Thomas and devastated the Colorado River ecosystem.

托马斯并摧毁了科罗拉多河生态系统。

Then, officials can make changes based on how the river ecosystem is changing.

然后，官员们可以根据河流生态系统的变化情况做出改变。

Joelle has been fishing on the Nile for decades, but industrial waste dumped into the water is having a devastating effect on the river's ecosystem.

乔尔几十年来一直在尼罗河上捕鱼，但倾倒在水中的工业废物对尼罗河的生态系统造成了毁灭性影响。

John Hamill, a volunteer with the organization Trout Unlimited, says the experiments will help explain the current situation of all the different river resources. Then, officials can make changes based on how the river ecosystem is changing.

约翰·哈米尔是" 鳟鱼无限" 组织的一名志愿者，他说借助过去的经验，可以解释所有河流资源的现状。然后，官员可以根据河流生态系统的改变做出相应的调整。