Evaluation of three field monitoring-density estimation protocols and their relevance to Komodo dragon conservation

Ariefiandy, Achmad, Purwandana, Deni, Seno, Aganto, Chrismiawati, Marliana, Jessop, Tim S. and Ciofi, Claudio 2014, Evaluation of three field monitoring-density estimation protocols and their relevance to Komodo dragon conservation, Biodiversity and conservation, vol. 23, no. 10, pp. 2473-2490, doi: 10.1007/s10531-014-0733-3.

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Title Evaluation of three field monitoring-density estimation protocols and their relevance to Komodo dragon conservation
Author(s) Ariefiandy, Achmad
Purwandana, Deni
Seno, Aganto
Chrismiawati, Marliana
Jessop, Tim S.ORCID iD for Jessop, Tim S. orcid.org/0000-0002-7712-4373
Ciofi, Claudio
Journal name Biodiversity and conservation
Volume number 23
Issue number 10
Start page 2473
End page 2490
Total pages 18
Publisher Springer
Place of publication Berlin, Germany
Publication date 2014-09
ISSN 0960-3115
Summary Finding practical ways to robustly estimate abundance or density trends in threatened species is a key facet for effective conservation management. Further identifying less expensive monitoring methods that provide adequate data for robust population density estimates can facilitate increased investment into other conservation initiatives needed for species recovery. Here we evaluated and compared inference-and cost-effectiveness criteria for three field monitoring-density estimation protocols to improve conservation activities for the threatened Komodo dragon (Varanus komodoensis). We undertook line-transect counts, cage trapping and camera monitoring surveys for Komodo dragons at 11 sites within protected areas in Eastern Indonesia to collect data to estimate density using distance sampling methods or the Royle-Nichols abundance induced heterogeneity model. Distance sampling estimates were considered poor due to large confidence intervals, a high coefficient of variation and that false absences were obtained in 45 % of sites where other monitoring methods detected lizards present. The Royle-Nichols model using presence/absence data obtained from cage trapping and camera monitoring produced highly correlated density estimates, obtained similar measures of precision and recorded no false absences in data collation. However because costs associated with camera monitoring were considerably less than cage trapping methods, albeit marginally more expensive than distance sampling, better inference from this method is advocated for ongoing population monitoring of Komodo dragons. Further the cost-savings achieved by adopting this field monitoring method could facilitate increased expenditure on alternative management strategies that could help address current declines in two Komodo dragon populations.
Language eng
DOI 10.1007/s10531-014-0733-3
Field of Research 050202 Conservation and Biodiversity
0501 Ecological Applications
0502 Environmental Science And Management
0602 Ecology
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2014, Springer
Persistent URL http://hdl.handle.net/10536/DRO/DU:30081785

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