Vernal pools are extremely important for amphibians and are where adults go to breed and where their young develop. Vernal pools are temporary wetlands which are dry part of the year, causing them to be devoid of fish that would otherwise prey on these amphibians. Vernal pools are a delicate ecosystem that is vulnerable to many threats, particularly development. Changes in the upland habitats that surround vernal pools can have a significant impact on the amphibians that breed in vernal pools because individuals spend much of the year in these areas after the breeding season. These changes in upland areas and direct impacts to vernal pools have the potential to eliminate local amphibian populations in the Great Northern Forests.