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The role of conservation translocations in the recovery of the endangered Djimaalap/noisy scrub-bird (Atrichornis clamosus): from Two Peoples Bay Nature Reserve and back

Sarah Comer , Alan Danks , Abby Berryman, Saul Cowen , Allan Burbidge , Graham Smith

Abstract

Context: Djimaalap/noisy scrub-bird (Atrichornis clamosus) translocations between 1983 and 2019 have been a major management strategy for this cryptic semi-flightless songbird, once considered extinct. Aims: We review 40 years of translocations, assessing the importance of Two Peoples Bay Nature Reserve as a source of founders, and the role of translocations in Djimaalap/noisy scrub-bird recovery. Methods: An evaluation of translocation successes and failures and the impact of removing birds from the Two Peoples Bay population when it was the only possible source. Research into territorial song to explain the social structure of scrub-birds, population genetics, habitat suitability, and the implications of learnings for future translocations. Key Results: Translocation has been the major contributor to an increase in the population index and Area of Occupancy, although removal of birds from Two Peoples Bay may have contributed to scrub-bird declines in this area. A more conservative approach to translocations was developed using small initial numbers of founders. Impacts of the translocation program on the genetic diversity of the metapopulation appear not to be significant. Conclusions: Conservation translocations have been instrumental in securing and conserving the Djimaalap/noisy scrub-bird, with considerable spatial expansion of the species range, in spite of significant bushfires impacting habitat. Implications: With the likelihood of unplanned fire increasing, and climate change likely to modify habitat, maximising the number of geographically distinct populations remains a priority for the conservation of the Djimaalap/noisy scrub-bird.

PC25017  Accepted 13 March 2025

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