Lake Erie has a complex ecosystem with many species in constant interaction.

How can we manage such complex ecosystems in a way that integrates ecological, social, and economic goals?

Wild, complex ecosystems are still the norm rather than the exception in its untamed depths.

It's a pretty complex ecosystem, though, and most imaginable niches seem to be filled.

As well as being complex ecosystems in themselves they also play a role in the biodiversity of the region.

A complete and complex ecosystem has established itself when two months ago there was none.

The landscape looks quite barren, but is actually a complex ecosystem with many forms of life.

Wetlands in Mexico are dynamic, complex and productive ecosystems.

It seems that each planet has a complex ecosystem with at least one intelligent life form.

"I hope they walk away able to see how complex ecosystems are."