Detectabilidad visual de aves en censos desde coche

1. Carrascal de la Puente, Luis María
2. Díaz González-Serrano, José Augusto
3. Ruiz, Marisol

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Abstract

This paper analyzes the variations in the detectability of eight bird species censused by car in open areas of Central Spain during winter. Species-specific detectability was higbly and positivelycorrelaled with bird size, bird-group size and percentage of time spent flying. These three variables explained 98 % of the variance in species detectability. We conclude that interspecific comparisons of the abundance or similar sized large bird species censused visually by car may not be valid due to their different behaviour.