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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Improving the analysis of movement data from marked individuals through explicit estimation of observer heterogeneity
Auteurs :	Fraenzi Korner-Nievergelt, Auteur ; Annette Sauter, Auteur ; Philip W. Atkinson, Auteur ; Jerome Guelat, Auteur ; Wojciech Kania, Auteur ; Marc Kéry, Auteur ; Ulrich Koeppen, Auteur ; Robert A. Robinson, Auteur ; Michael Schaub, Auteur ; Kasper Thorup, Auteur ; Henk van der Jeugd, Auteur ; Arie J. van Noordwijk, Auteur
Type de document :	Article
Dans :	Journal of Avian Biology (41(1) JAN 2010)
Article en page(s) :	8-17
Langues:	Anglais
Résumé :	Ring re-encounter data, in particular ring recoveries, have made a large contribution to our understanding of bird movements. However, almost every study based on ring re-encounter data has struggled with the bias caused by unequal observer distribution. Re-encounter probabilities are strongly heterogeneous in space and over time. If this heterogeneity can be measured or at least controlled for, the enormous number of ring re-encounter data collected can be used effectively to answer many questions. Here, we review four different approaches to account for heterogeneity in observer distribution in spatial analyses of ring re-encounter data. The first approach is to measure re-encounter probability directly. We suggest that variation in ring re-encounter probability could be estimated by combining data whose re-encounter probabilities are close to one (radio or satellite telemetry) with data whose re-encounter probabilities are low (ring re-encounter data). The second approach is to measure the spatial variation in re-encounter probabilities using environmental covariates. It should be possible to identify powerful predictors for ring re-encounter probabilities. A third approach consists of the comparison of the actual observations with all possible observations using randomization techniques. We encourage combining such randomisations with ring re-encounter models that we discuss as a fourth approach. Ring re-encounter models are based on the comparison of groups with equal re-encounter probabilities. Together these four approaches could improve our understanding of bird movements considerably. We discuss their advantages and limitations and give directions for future research.

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