Islands closer to the mainland typically have:
“Higher immigration rates” for islands closer to the mainland typically have. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Larger islands usually support more habitats and larger populations, lowering extinction risk; less isolated islands receive colonists more readily and may experience rescue effects. These mechanisms also apply to habitat fragments that function as ecological islands. The remaining alternatives—“Lower immigration rates”, “Higher extinction rates”, “No change in immigration
Ref: Biogeography, Lomolino et al., 5th Ed., Ch. 1-4