 According to the researchers, led by Mark C. Urban, an ecologist at the University of Connecticut, diversity decreased when they took these factors into account, and that new communities of organisms, which do not exist today, emerged.As a result, the rate of extinctions may be higher than previously projected.According to research published in the 30 May 2014 issue of "Science," most known species have small ranges, and the numbers of small-ranged species are increasing quickly.