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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Using microphone arrays to examine effects of observers on birds during point count surveys
Auteurs :	Margaret Campbell, Auteur ; Charles M. Francis, Auteur
Type de document :	Article
Dans :	Journal of Field Ornithology (83(4) DEC 2012)
Article en page(s) :	391-402
Langues:	Anglais
Résumé :	Point count surveys are widely used for monitoring songbird populations, but little is known of the effect of the observer on songbird behavior during point counts. We used a novel, wireless array of recorders to determine the location of singing birds with and without the presence of an observer. The array consisted of seven autonomous recording units synchronized to Global Positioning System (GPS) clocks, set around the perimeter of a 50-m-radius circle with one in the middle. Units were set to record automatically from half an hour before dawn until 10:00 each morning. We sampled 26 different locations in old fields at the Prince Edward Point National Wildlife Area in eastern Ontario between 1 June and 4 July 2007. Position estimates derived from a time-lag cross-correlation algorithm had a mean error of 1.7 m within 50 m and 5.6 m at 100 m from the center of the array. We found no difference in the positions of birds when an observer was present or absent. We also found no difference in the number of individuals or species detected or in the onset of singing. Our results suggest that, at least in the community we studied, observers conducting point counts do not cause significant changes in bird behavior.

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