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Since 1976, islands have been surveyed periodically (not annually) for seabirds. Seabird nesting islands (SNI) are defined as an island, ledge, or portion thereof in tidal waters that has 25 or more documented nests, adult seabirds associated with nests, or combination thereof (single species or aggregate of different species) in any nesting season since 1976 provided that the island, ledge, or portion thereof continues to have suitable nesting habitat. In addition, seabird nesting islands are also defined as an island, ledge, or portion thereof in tidal waters that has one or more documented nests of a seabird that is a Maine endangered or threatened species in any year since 1976 provided that the island, ledge, or portion thereof, continues to have suitable nesting habitat. |