assumptions may limit specific predictions

Estimates are based on typical values for the species-area curves

Groups with broad ranges like marine mammals have lower rates of
species extinction than the model predicts.

Assumes all endemic species are eliminated from areas that have
been largely cleared of forest.

Some species can survive in isolated
patches or become adapted to selectively logged environments

Assumes the habitat areas are eliminated at random.

Areas with high
species richness are targets of conservation efforts

Degree of habitat fragmentation may affect extinction rates

Fragmenting land via hunting, clearing, etc., may lead to further species
loss than predicted.