What is an evolutionary factor that influences the species richness of a community?

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Speciation rate is the evolutionary process by which new species arise, and this directly influences the species richness of a community. Communities with higher rates of speciation will have a greater diversity of species. Factors such as amount of sunlight, precipitation, geographic size, and distance to other communities can indirectly influence species richness by affecting the habitats available for different species, but they do not necessarily promote or inhibit the creation of new species.

What Is an Evolutionary Factor That Influences the Species Richness