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Critically endangered Fijian crested iguana (Brachylophus vitiensis) shows habitat preference for globally threatened tropical dry forest

Morrison, Clare and Keppel, Gunnar and Thomas, Nunia T. and Rounds, Isaac and Harlow, P.S. (2009) Critically endangered Fijian crested iguana (Brachylophus vitiensis) shows habitat preference for globally threatened tropical dry forest. Pacific Science, 63 (2). pp. 223-242. ISSN 0030-8870

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Abstract

Tropical dry forests are a unique and threatened ecosystem in the Pacific and globally. In Fiji, the endangered Fijian crested iguana (Bracbylopbus vitiensis) is endemic to tropical dry forests. Yadua Taba Island contains one of the best remaining stands of tropical dry forest in the Pacific along with the largest (and only secure) population of B. vitiensis in Fiji and has been proposed as a translocation source for iguana conservation. In this study we determined the major vegetation types on Yadua Taba and identified forest habitat preferences of B. vitiensis to (1) characterize the island's habitats for tropical dry forest regeneration monitoring and (2) understand which forest types are preferred by iguanas for future translocation projects. Vegetation data were collected using reconnaissance, entitation, line transects, and aerial photos. Iguana abundance data were collected by nocturnal surveys of permanent transects. Six major vegetation types were identified of which tropical dry forest was the largest (46% of the island), followed by a combination of rocky cliff-shrubland/grassland vegetation (26%). Our conservative estimate of B. vitiensis population size on Yadua Taba is 12,000 iguanas, the majority of which occur in tropical dry forest. Superabundance of the dry forest understory tree Vavaea amicorum, the favorite fruit species of iguanas, may help account for the high density of iguanas observed. These results highlight the ecological link between tropical dry forest and B. vitiensis and emphasize the importance of rehabilitation or conservation of tropical dry forest habitat in potential iguana translocation sites as part of the management plan for B. vitiensis throughout the Fiji Islands.

Item Type: Journal Article
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: Faculty of Science, Technology and Environment (FSTE) > School of Biological and Chemical Sciences
Faculty of Science, Technology and Environment (FSTE) > Institute of Applied Science
Depositing User: Ms Neha Harakh
Date Deposited: 25 May 2009 11:48
Last Modified: 13 Jul 2012 20:21
URI: http://repository.usp.ac.fj/id/eprint/1479
UNSPECIFIED

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