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Wolf Lethal Control and Livestock Depredations: Counter-Evidence from Respecified Models

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  • Niraj Poudyal
  • Nabin Baral
  • Stanley T Asah

Abstract

We replicated the study conducted by Wielgus and Peebles (2014) on the effect of wolf mortality on livestock depredations in Montana, Wyoming and Idaho states in the US. Their best models were found to be misspecified due to the omission of the time index and incorrect functional form. When we respecified the models, this replication failed to confirm the magnitude, direction and often the very existence of the original results. Wielgus and Peebles (2014) reported that the increase in the number of wolves culled the previous year would increase the expected number of livestock killed this year by 4 to 6%. But our results showed that the culling of one wolf the previous year would decrease the expected number of cattle killed this year by 1.9%, and the expected number of sheep killed by 3.4%. However, for every wolf killed there is a corresponding 2.2% increase in the expected number of sheep killed in the same year. The increase in sheep depredation appears to be a short term phenomenon.

Suggested Citation

  • Niraj Poudyal & Nabin Baral & Stanley T Asah, 2016. "Wolf Lethal Control and Livestock Depredations: Counter-Evidence from Respecified Models," PLOS ONE, Public Library of Science, vol. 11(2), pages 1-8, February.
    • Handle: RePEc:plo:pone00:0148743
    DOI: 10.1371/journal.pone.0148743
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    References listed on IDEAS

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    1. Robert B Wielgus & Kaylie A Peebles, 2014. "Effects of Wolf Mortality on Livestock Depredations," PLOS ONE, Public Library of Science, vol. 9(12), pages 1-16, December.
    2. Spanos, Aris, 2010. "Statistical adequacy and the trustworthiness of empirical evidence: Statistical vs. substantive information," Economic Modelling, Elsevier, vol. 27(6), pages 1436-1452, November.
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    Cited by:

    1. Lyudmyla Kompaniyets & Marc A Evans, 2017. "Modeling the relationship between wolf control and cattle depredation," PLOS ONE, Public Library of Science, vol. 12(10), pages 1-13, October.

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