The bill uses science and planning together to help protect rich and threatened ecosystems.

Their great adaptability may threaten endemic species and ecosystems into which they have been introduced.

Any flow reductions that result from implementation of non-discharging alternatives must not threaten U.S. or shared ecosystems".

Because these species were not native to the U.S., they could have threatened native ecosystems.

This has led to ground subsidence as dry caves collapse, threatening property as well as ecosystems.

Such a collapse would occur due to pollution and overfishing, threatening oceanic ecosystems, according to some researchers.

However, waste dumping threatens marine ecosystems by poisoning marine life and eutrophication.

This taste for fins, marine biologists say, is ridding the world's oceans of one of its most ancient creatures, threatening ecosystems already buffeted by overfishing.

The need for change of the existing legal framework results from the increasing scope of this phenomenon which threatens ecosystems and fisheries in the Community.

People need to be aware of the broader issue of fishing methods that threaten many species of fish as well as entire marine ecosystems.