Based on continuous habitat suitability values (from 0 to 1) for a butterfly species, I'm comparing different conservation strategies, that would output different possible networks of protected areas.
Based on the assumption that suitable habitat will be destroyed in unprotected areas because of high anthropic pressures, I would like to calculate a connectivity index for remaining habitat patches, based on different conservation scenarios. This connectivity index should take into account the distances among remaining habitat patches, but also their habitat suitability values.
Does such an index exist? If so, how to compute it?