La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Calibration of visually estimated distances to migrating seabirds with radar measurements
Auteurs :	Maria Mateos, Auteur ; Gonzalo M. Arroyo, Auteur ; Alejandro Rodriguez, Auteur ; David Cuenca, Auteur ; AndreS De la Cruz, Auteur
Type de document :	Article
Dans :	Journal of Field Ornithology (81(3) SEP 2010)
Article en page(s) :	302-309
Langues:	Anglais
Mots-clés :	Radar
Résumé :	Censusing seabirds from coastal areas requires reliable estimates of bird numbers and the distances of the birds from the coastline. Logistical constraints make visual estimation of distances the only feasible method in many studies. We tested the accuracy of visually estimated offshore distances of six migratory seabird species in the Strait of Gibraltar using simultaneous measurements obtained by radar. Most birds (91%) were detected within 3 km of the coast and we truncated our calibration at this distance. We found a strong correlation between radar and visual estimates (R(2) = 0.83, P

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