While the effects of fire vary in different ecosystems, some general principles apply.

Treks range from one to 12 nights and travel through all the different ecosystems of the Park.

Furthermore, information on the country's different ecosystems is generated.

There are, in fact, three different ecosystems: oak, pine and river groves.

That question, which may have different answers for different ecosystems, is still to be investigated.

Islands can have very different ecosystems than their mainland counterparts.

Two different ecosystems wrestle with one another and adapt to survive.

For that reason very different ecosystems can be found inside the park.

Geologic studies indicate that this salt lake was once part of a very different ecosystem.

Down toward the bottom of the canyon there must be a completely different ecosystem from what we see up on the surface.