Ecological Assessment for BAJIGAL (Stephens Island)

Abstract

This report presents the findings of rapid ecological field surveys conducted on Bajigal (Stephens Island) in the northern Great Barrier Reef. The study provides a comprehensive snapshot of biodiversity values, habitat condition, and key ecological threats to inform management actions aimed at improving and protecting island ecosystems. The assessment documents a diverse range of ecological conditions, from intact areas of high conservation significance to highly disturbed environments dominated by invasive species. Bajigal supports unique and regionally significant vegetation communities, including threatened ecological communities and notable flora records such as Pisonia grandis and other species representing range extensions. The island also contains important seabird habitat, particularly for bridled terns (Onychoprion anaethetus), alongside records of threatened shorebirds and other fauna. Key threats identified include widespread and emerging invasive plant species, disturbance from cyclonic events, and factors potentially limiting seabird nesting habitat. The findings provide an evidence base to inform the development of the Bajigal Restoration Plan, supporting targeted management actions to maintain and enhance the ecological integrity of the island within the Great Barrier Reef World Heritage Area. This work forms a key deliverable under the Restoration of Reef Islands Project, delivered through the Reef Joint Field Management Program (Great Barrier Reef Marine Park Authority and Queensland Parks and Wildlife Service) in partnership with Mandubarra Land and Sea Inc, and Aestra as the environmental delivery partner, and funded by the Australian Government’s Reef Trust. The project aims to support the rehabilitation, enhancement, and long-term resilience of island ecosystems within the Great Barrier Reef World Heritage Area.