Students can also conduct environmental research here and deepen their appreciation for California's biological richness.

Although they cover less than 5% of the world's land surface, their biological richness makes them high priorities for ecosystem conservation.

The discovery of its current biological richness was a surprise.

Sometimes, researchers report, invasive species can add to the biological richness of a given habitat.

Instead of setting aside everything that looks interesting, this system helps us find the areas of the highest biological richness.

The park forms the southern portion of the subantarctic forest and is known for its biological richness.

It has been cut up into so many fragments that much of its native biological richness has been lost.

This, the ecologists believe, is what gave the prairie its biological richness and diversity.

Mark Matsil, the chief of the city Parks Department's natural resources group, explained that the region's biological richness is a result of many things coming together.

The biological richness of Yasuní has astonished scientists.