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Vocalization activity of breeding shorebirds: documentation of its seasonal decline and applications for breeding bird surveys

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We documented vocalization activity of breeding shorebirds at two sites in northern and western Alaska, on the Colville River Delta and on the Yukon – Kuskokwim Delta. At both sites, number of calling individuals decreased throughout the season. Variation in vocalization activity was significantly higher at the Colville River Delta towards the end of the season, while weather variables affected vocalization activity only on the Yukon – Kuskokwim Delta. Our results highlight the importance of timing, weather, and site-specific attributes on number of birds detected. We discuss our findings in the context of different methods to monitor breeding shorebirds.

Nous avons étudié les émissions de vocalises des oiseaux de rivage pendant la période de reproduction à deux sites du nord et de l'ouest de l'Alaska, le delta du fleuve Colville et le delta des fleuves Yukon et Kuskokwim. Aux deux endroits, le nombre d'individus qui font des vocalises diminue au cours de la saison. La variation de l'émission de vocalises est significativement plus élevée à delta du fleuve Colville vers la fin de la saison, alors que les variables climatiques n'affectent ces activités qu'à delta des fleuves Yukon et Kuskokwim. Nos observations mettent en évidence l'influence du moment, du climat et des caractéristiques spécifiques au site sur le nombre d'oiseaux recensés. Nous discutons de nos résultats en fonction des différentes méthodes de recensement des oiseaux de rivage pendant la période de reproduction.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2003-10-01

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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