He wanted to investigate which trees provide the best ecological diversity.

Loaded with symbolism, the apple in all its variety symbolises the cultural, physical and ecological diversity that we must not let slip away.

These colonies are often critical to local ecological diversity and horticulture.

The bill was a failure, and did not take into consideration the ecological diversity of the land it reallocated.

It includes the physiological and ecological diversity within a rapidly multiplying lineage.