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Spatiotemporal requirements of the Hainan gibbon: does home range constrain recovery of the world's rarest ape?

Bryant, J; Zeng, X; Hong, X; Chatterjee, H; Turvey, S; (2017) Spatiotemporal requirements of the Hainan gibbon: does home range constrain recovery of the world's rarest ape? American Journal of Primatology , 79 (3) , Article e22617. 10.1002/ajp.22617. Green open access

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Abstract

Conservation management requires an evidence-based approach, as uninformed decisions can signify the difference between species recovery and loss. The Hainan gibbon, the world’s rarest ape, reportedly exploits the largest home range of any gibbon species, with these apparently large spatial requirements potentially limiting population recovery. However, previous home range assessments rarely reported survey methods, effort or analytical approaches, hindering critical evaluation of estimate reliability. For extremely rare species where data collection is challenging, it also is unclear what impact such limitations have on estimating home range requirements. We re-evaluated Hainan gibbon spatial ecology using 75 hours of observations from 35 contact days over 93 field-days across wet (June 2011-September 2011) and dry (November 2010-February 2011) seasons. We calculated home range area for three social groups (N=21 individuals) across the sampling period, seasonal estimates for one group (based on 24 days of observation; 12 days per season), and between-group home range overlap using multiple approaches (Minimum Convex Polygon, Kernel Density Estimation, Local Convex Hull, Brownian Bridge Movement Model), and assessed estimate reliability and representativeness using three approaches (Incremental Area Analysis, spatial concordance, and exclusion of expected holes). We estimated a yearly home range of 1–2 km2, with 1.49 km2 closest to the median of all estimates. Although Hainan gibbon spatial requirements are relatively large for gibbons, our new estimates are smaller than previous estimates used to explain the species’ limited recovery, suggesting that habitat availability may be less important in limiting population growth. We argue that other ecological, genetic, and/or anthropogenic factors are more likely to constrain Hainan gibbon recovery, and conservation attention should focus on elucidating and managing these factors.

Type: Article
Title: Spatiotemporal requirements of the Hainan gibbon: does home range constrain recovery of the world's rarest ape?
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/ajp.22617
Publisher version: http://dx.doi.org/10.1002/ajp.22617
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Home range estimation, Nomascus hainanus, KDE, LoCoH, spatial ecology
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Genetics, Evolution and Environment
URI: http://discovery.ucl.ac.uk/id/eprint/1522122
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