Once leached into the rivers they can affect the river ecology through eutrophication, causing damage to plants and animals.

What really needs to be done to protect river ecology here and elsewhere, Mr. Faber said, is to end building in flood plains.

The river ecology is under threat from human activity.

The proximity of city's industry has a heavy influence on the river ecology.

Frank J. Crescenzo, the deputy area manager for the Energy Department at the lab, said the federal plan would protect public health and river ecology.

Wild Boar are to woodland ecology what Beavers are to river ecology.

Efforts to restore its river ecology and riparian habitats are growing.

But the hippo was essential to Africa's river ecology.

The restoration project aimed to raise the water level within the river, restore the river ecology to its previous state and improve its habitats.

Mr. Sprung paused, then continued: "They are going to make river ecology more important than the housing of people.