For both measures, biodiversity is higher in scenarios with larger parcels of habitat available and where patches of intact habitat are closer together. These results concur with field observations and indicate that human activities that affect one type of biodiversity, such as causing the extinction of species, will produce a similar response in other measures of biodiversity. For example, it has been shown that both species diversity and genetic diversity of forest plants remain at similarly low levels in secondary forests relative to primary forests, even when secondary forests are upwards of 100 years old.
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Mark Vellend, "Species diversity and genetic diversity: Parallel processes and correlated patterns" 166:2 August 2005.