Meanings of increasing richness in English

But the increasing richness of the pans began to worry him.

We found that plant diversity significantly declined with increasing richness of introduced earthworm ecological groups.

Though the dipping gold-trace increased the man's work, he found consolation in the increasing richness of the pans.

A fever seemed to be growing in him, nor did the increasing richness of the test-pans allay this fever.

By affecting colonizing taxa differently and increasing richness, the contaminant may alter the ecological context under which subsequent effects of exposure will unfold.