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Learning to count: adapting population monitoring for Endangered huemul deer Hippocamelus bisulcus to meet conservation objectives

  • Heiko U. Wittmer (a1), Paulo Corti (a2), Cristián Saucedo (a3) and José Luis Galaz (a4)
Abstract
Abstract

Considerable efforts have been invested in recent years to improve methods for both data collection and analyses required for population monitoring. Where historical or current estimates of population size are not adjusted for detection probabilities they may be too inaccurate to provide meaningful estimates of trends and thus monitoring methods need to be adapted. Here, we use data from the Endangered huemul deer Hippocamelus bisulcus to outline a framework to develop accurate robust estimates of detection probabilities that can be incorporated into new surveys in a cost-effective way and applied to existing survey data sets. In particular, by retroactively estimating detection probabilities for surveys of huemul, we show that current survey methods for huemul are inadequate to determine population trends reliably. Based on these results we propose a new monitoring method for the huemul and discuss the importance of estimating accuracies of historical survey data to ensure that changes in the abundance of the species reflect real population trends and are not an artefact of variation over time in the accuracy of survey data.

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Corresponding author
Wildlife, Fish, and Conservation Biology, University of California, Davis, California, USA. E-mail heiko.wittmer@vuw.ac.nz
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Current address: School of Biological Sciences, Victoria University of Wellington, P.O. Box 600, Wellington 6140, New Zealand

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References
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Cabrera A. & Yepes J. (1960) Mamíferos Sudamericanos, 2nd edition. Edian, Buenos Aires, Argentina.
Caswell H. (2001) Matrix Population Models: Construction, Analysis, and Interpretation, 2nd edition. Sinauer Associates, Sunderland, USA.
Caughley G. (1974) Bias in aerial survey. Journal of Wildlife Management, 38, 921933.
CONAF (Corporación Nacional Forestal) (2001) Plan para la conservación del huemul del sur Hippocamelus bisulcus en Chile. Unpublished Report. Corporación Nacional Forestal, Santiago, Chile.
Corti P. (2008) Organisation sociale, dynamique de population, et conservation du cerf huemul (Hippocamelus bisulcus) dans la Patagonie du Chili. PhD thesis, Université de Sherbrooke, Quebec, Canada.
Corti P., Wittmer H.U. & Festa-Bianchet M. (2010) Dynamics of a small population of endangered huemul deer (Hippocamelus bisulcus) in Chilean Patagonia. Journal of Mammalogy, 91, 690697.
Efron B. & Tibshirani R. (1993) An Introduction to the Bootstrap. Chapman & Hall, London, UK.
Frid A. (1999) Huemul (Hippocamelus bisulcus) sociality at a periglacial site: sexual aggregation and habitat effects of group size. Canadian Journal of Zoology, 77, 10831091.
Gaillard J.M., Festa-Bianchet M., Yoccoz N.G., Loison A. & Toigo C. (2000) Temporal variation in fitness components and population dynamics of large herbivores. Annual Review in Ecology and Systematics, 31, 367393.
Gill R., Saucedo C., Aldridge D. & Morgan G. (2008) Ranging behaviour of huemul in relation to habitat and landscape. Journal of Zoology, 274, 254260.
Hood G.M. (2005) Pop Tools (version 2.6.6). Http://www.cse.cisro.au/poptools [accessed 1 August 2009].
Jiménez J., Guineo G., Corti P., Smith J.A., Flueck W., Vila A. et al. . (2008) Hippocamelus bisulcus. In IUCN Red List of Threatened Species v. 2010.2. Http://www.iucnredlist.org [accessed 6 July 2010].
Lancia R.A., Kendall W.L., Pollock K.H. & Nichols J.D. (2005) Estimating the number of animals in wildlife populations. In Techniques for Wildlife Investigations and Management, 6th edition. (ed. Braun C.E.), pp. 106153. The Wildlife Society, Bethesda, USA.
Largo E., Gaillard J.-M., Festa-Bianchet M., Toïgo C., Bassano B., Cortot H. et al. . (2008) Can ground counts reliably monitor ibex Capra ibex populations? Wildlife Biology, 14, 489499.
Mace G.M., Collar N.J., Gaston K.J., Hilton-Taylor C., Akçakaya H.R., Leader-Williams N. et al. . (2008) Quantification of extinction risk: IUCN’s system for classifying threatened species. Conservation Biology, 22, 14241442.
Marsh H., Lawler I.R., Kwan D., Delean S., Pollock K. & Alldredge M. (2004) Aerial surveys and the potential biological removal technique indicate that the Torres Strait dugong fishery is unsustainable. Animal Conservation, 7, 435443.
McConville A.J., Grachev I.A., Keane A., Coulson T., Bekenov A.B. & Milner-Gulland E.J. (2009) Reconstructing the observation process to correct for changing detection probability of a Critically Endangered species. Endangered Species Research, 6, 223229.
Milner-Gulland E.J., Bukreeva O.M., Coulson T.N., Lushchekina A.A., Kholodova M.V., Bekenov A.B. & Grachev I.A. (2003) Reproductive collapse in saiga antelope harems. Nature, 422, 135.
Morellet N., Gaillard J.-M., Hewison A.J.M., Ballon P., Boscardin Y., Duncan P. et al. . (2007) Indicators of ecological change: new tools for managing populations of large herbivores. Journal of Applied Ecology, 44, 634643.
Pollock K.H., Winterstein S.R., Bunck C.M. & Curtis P.D. (1989) Survival analysis in telemetry studies: the staggered entry design. Journal of Wildlife Management, 53, 715.
Redford K.H. & Eisenberg J.F. (1992) Mammals of the Neotropics, Vol. 2. The Southern Cone: Chile, Argentina, Uruguay, Paraguay. University of Chicago Press, Chicago, USA.
Smith-Flueck J.A.M. & Flueck W.T. (1997) Relevamiento de una población de huemul en la provincia de Río Negro, Argentina. Mastozoologia Neotropical, 4, 2533.
Tyre A.J., Tenhumberg B., Field S.A., Niejalke D., Parris K. & Possingham H.P. (2003) Improving precision and reducing bias in biological surveys: estimating false-negative error rates. Ecological Applications, 13, 17901801.
Vila A.R., López R., Pastore H., Faúndez R. & Serret A. (2006) Current distribution and conservation of the huemul (Hippocamelus bisulcus) in Argentina and Chile. Mastozoologia Neotropical, 13, 263269.
Williams B.K., Nichols J.D. & Conroy M.J. (2002) Analysis and Management of Animal Populations: Modeling, Estimation, and Decision Making. Academic Press, San Diego, USA.
Wittmer H.U., Powell R.A. & King C.M. (2007) Understanding contributions of cohort effects to growth rates of fluctuating populations. Journal of Animal Ecology, 76, 946956.
Yoccoz N., Nichols J.D. & Bouliner T. (2001) Monitoring of biological diversity in space and time. Trends in Ecology & Evolution, 16, 446453.
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Oryx
  • ISSN: 0030-6053
  • EISSN: 1365-3008
  • URL: /core/journals/oryx
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