 As a result of the threat, about 1,200 workers and residents evacuated Johnston Atoll to Hawaii.Prior to leaving, workers secured construction equipment and other loose items.Some biologists on Johnston Atoll were concerned that the hurricane would severely impact the reproductive cycle of over 150,000 birds in the Johnston Atoll National Wildlife Refuge, a concern expressed after Hurricane John in 1994 killed 80% of the island's bird population.