Effect of observer experience on the monitoring of a mouflon population |
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Authors: | Mathieu Garel Jean-Marc Cugnasse Jean-Michel Gaillard Anne Loison Yanto Santosa Marie-Line Maublanc |
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Institution: | (1) Unité Mixte de Recherche n°5558 Biométrie et Biologie Evolutive, Bâtiment Gregor Mendel, Université Claude Bernard Lyon 1, 43 Boulevard du 11 novembre 1918, 69622 Villeurbanne Cedex, France;(2) Office National de la Chasse et de la Faune Sauvage, Centre National dEtude et de Recherche Appliquée Faune de Montagne, BP 74267, 34098 Montpellier Cedex 5, France |
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Abstract: | Analysis of changes in population size can be severely biased when factors related to the acquisition of data, such as differences
between observer experience and changes through time in the ability of individual observers to detect animals, are not controlled
for. We analysed the effect of observer qualification on the number of groups and individuals observed during two census days
of a mouflonOvis gmelini musimon xOvis sp. population. The difference between professional wildlife biologists and volunteers was strong during the census day one
(87 groups and 410 mouflons vs 55 and 249 by experienced observers and volunteers, respectively) but decreased significantly
on the second day for the number of animals detected (390 vs 292 mouflons by experienced observers and volunteers, respectively).
Our result indicates that additional training will enhance reliability of data obtained from volunteers. Given the effect
of observer qualification on performance during the census, we recommend to use observers of similar and adequate qualification
in population counts. |
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