Journal
RESTORATION ECOLOGY
Volume 31, Issue 1, Pages -Publisher
WILEY
DOI: 10.1111/rec.13770
Keywords
bird; critically endangered; forest; habitat restoration; Indonesia
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The remnant forests on the small island of Sangihe north of Sulawesi are of great importance for conserving critically endangered bird species. The study identifies specific habitat features and areas where habitat is slightly unsuitable for these species. The findings highlight the importance of the Sahendaruman crater area for the conservation of these species and suggest measures for enhancing the habitat.
Remnant forests on the small Wallacean island of Sangihe north of Sulawesi hold the entire ranges of more critically endangered (CR) bird species than any other comparable area on earth. We develop habitat association models for three of these CR species to identify critical habitat features as well as areas where habitat falls slightly short of suitability, and to determine whether another area of forest away from the largest block might be suitable as an insurance site for a translocated population. Hopes for all three species appear almost totally pinned to forest within a 13 km(2) area of the Sahendaruman crater, with virtually no near-suitable habitat away from this site. There is, however, little overlap in habitats between one CR species and the other two: cerulean flycatcher Eutrichomyias rowleyi is associated with mature streamside forest with full canopy cover, lianas, and mid-level growth, while Sangihe whistler Coracornis sanghirensis and Sangihe golden bulbul Hypsipetes platenae are restricted to ridgetop forest with full canopy cover and large trees. We pinpoint small areas (around 5 km(2)) of forest in the crater that are already suitable or can be made so with habitat management, and these are absolute priorities for conservation action. We show how habitat characteristics identified within models might be enhanced, and how features, especially certain tree species, can be used as indicators of future habitat improvement.
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