When a habitat is very diverse with a variety of different species, it is much healthier and more stable. One of the reasons for this is that disease doesn't spread as easily in a diverse community. If one species gets a disease, others of its kind are far enough away (due to the variety of other organisms) that disease is often stopped at the one or two individuals.
Based on this table, excerpted from http://www.accessexcellence.org/AE/ATG/data/released/0534-KathyParis/index.php, What is diversity and how is it figured?
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