The studies done in Europe have shown diversity among plants decreased due to nitrogen deposition.

During the Cretaceous, the diversity of Cupedidae and Archostemata decreased considerably.

Scientific research has shown that as inbreeding increases genetic diversity decreases along with increasing the risk of population decline.

I don't expect academics to fret about these matters", regarding a study showing that diversity decreases the social capital of a community.

Most scientist believe that diversity on Earth is now decreasing due primarily to habitat destruction.

When diversity decreases, these persistent species remain, often increasing the prevalence of disease.

As players' levels increase, the diversity of styles decreases slightly, because technically weak styles are quickly eliminated.

When many of the species cannot survive, the diversity of the forest decreases drastically.

It is believed that the diversity of the site's fauna has decreased by 25% since 1973.

As the diversity of surface plants decreases, animal species that rely on them diminish as well.