Species diversity: is not predictable relative to how close an ecosystem is to the equator. decreases as you move away from the equator in both terrestrial and marine ecosystems. increases as you move away from the equator in both terrestrial and marine ecosystems. decreases as you move away from the equator in marine ecosystems, but increases as you move away from the equator in terrestrial ecosystems. decreases as you move away from the equator in terrestrial ecosystems, but increases as you move away from the equator in marine ecosystems.