Abstract
We test relationships between structure of acoustic signal used for individual recognition and nesting ecology among two gulls: the black-headed gull ( Larus ridibundus), in which chicks remain in the nest, and the slender-billed gull ( L. genei), in which chicks leave the nest after hatching to form crèches. A striking difference between both species is the presence of two fundamental frequencies in the slender-billed gull's call and only one in the black-headed gull's call. Our study shows that the potential for individuality coding is more important in the species where the offspring experiment the greatest constraints – due to their nesting pattern – to identify their parents. To cite this article: N. Mathevon et al., C. R. Biologies 326 (2003).
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