Identifying environmental versus phylogenetic correlates of behavioural ecology in gibbons: implications for conservation management of the world’s rarest ape

BMC Evolutionary Biology

Research Article

Valérie A. Olson¹  Helen J. Chatterjee²  Samuel T. Turvey³  Jessica V. Bryant⁴ 

[1] Care Quality Commission, 103-105 Bunhill Row, EC1Y 8TG, London, UK;Department of Genetics, Evolution and Environment, University College London, Gower Street, WC1E 6BT, London, UK;Institute of Zoology, Zoological Society of London, Regent’s Park, NW1 4RY, London, UK;Institute of Zoology, Zoological Society of London, Regent’s Park, NW1 4RY, London, UK;Department of Genetics, Evolution and Environment, University College London, Gower Street, WC1E 6BT, London, UK;

关键词: Comparative analysis;    Group size;    Hainan gibbon;    Home range;    Hylobatidae;    Lambda;    Mating system;    Nomascus hainanus;    Phylogenetic signal;   

DOI  :  10.1186/s12862-015-0430-1

 received in 2015-03-25, accepted in 2015-07-16,  发布年份 2015

来源: Springer

【 摘 要 】

BackgroundFor conservation of highly threatened species to be effective, it is crucial to differentiate natural population parameters from atypical behavioural, ecological and demographic characteristics associated with human disturbance and habitat degradation, which can constrain population growth and recovery. Unfortunately, these parameters can be very hard to determine for species of extreme rarity. The Hainan gibbon (Nomascus hainanus), the world’s rarest ape, consists of a single population of c.25 individuals, but intensive management is constrained by a limited understanding of the species’ expected population characteristics and environmental requirements. In order to generate a more robust evidence-base for Hainan gibbon conservation, we employed a comparative approach to identify intrinsic and extrinsic drivers of variation in key ecological and behavioural traits (home range size, social group size, mating system) across the Hylobatidae while controlling for phylogenetic non-independence.ResultsAll three studied traits show strong phylogenetic signals across the Hylobatidae. Although the Hainan gibbon and some closely related species have large reported group sizes, no observed gibbon group size is significantly different from the values expected on the basis of phylogenetic relationship alone. However, the Hainan gibbon and two other Nomascus species (N. concolor, N. nasutus) show home range values that are higher than expected relative to all other gibbon species. Predictive models incorporating intraspecific trait variation but controlling for covariance between population samples due to phylogenetic relatedness reveal additional environmental and biological determinants of variation in gibbon ranging requirements and social structure, but not those immediately associated with recent habitat degradation.ConclusionsOur study represents the first systematic assessment of behavioural and ecological trait patterns across the Hylobatidae using recent approaches in comparative analysis. By formally contextualising the Hainan gibbon’s observed behavioural and ecological characteristics within family-wide variation in gibbons, we are able to determine natural population parameters expected for this Critically Endangered species, as well as wider correlates of variation for key population characteristics across the Hylobatidae. This approach reveals key insights with a direct impact on future Hainan gibbon conservation planning, and demonstrates the usefulness of the comparative approach for informing management of species of conservation concern.

【 授权许可】

CC BY   
© Bryant et al. 2015