As a rough estimate, the species-area relationship derived from the theory of island biogeography predicts that a 90% reduction of habitat area results in a _____% loss of species diversity if no other factors are taken into account.

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The species-area relationship, often modeled by the equation S = cAz (where S is the number of species, A is the area, c is a constant, and z is typically between 0.2 and 0.35), suggests that a 90% reduction in habitat area would lead to approximately a 50% loss in species diversity. This is because the relationship is not linear but follows a power law, where a smaller reduction in area leads to a disproportionately larger loss of species.

As a Rough Estimate, the Species-Area Relationship Derived from the Theory