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Migration and stopover strategies of individual Dunlin along the Pacific coast of North America

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Abstract:

We radio-marked 18 Dunlin, Calidris alpina (L., 1758), at San Francisco Bay, California, and 11 Dunlin at Grays Harbor, Washington, and relocated 90% of them along the 4200 km long coastline from north of San Francisco Bay to the Yukon–Kuskokwim Delta, Alaska. The Copper River Delta, Alaska, was the single most important stopover site, with 79% of the marked birds detected there. Our second most important site was the Willapa Bay and Grays Harbor complex of wetlands in Washington. The mean length of stay past banding sites ranged from 1.0 to 3.8 days. Controlling for date of departure, birds banded at San Francisco Bay had higher rates of travel to the Copper River Delta than those banded at Grays Harbor. The later a bird left a capture site, the faster it traveled to the Copper River Delta. Length of stay at the Copper River Delta was inversely related to arrival date. We did not find any effect of sex on travel rate or length of stay. Combining the results of this study with our previous work on Western Sandpipers, Calidris mauri (Cabanis, 1875), reveals variation of migration strategies used within and among shorebird species along the eastern Pacific Flyway.

Nous avons muni d'émetteurs radio 18 bécasseaux variables, Calidris alpina (L., 1758), de la baie de San Francisco, Californie, et 11 autres de Grays Harbor, Washington; nous avons retracé 90 % de ces oiseaux le long des 4200 km de côte, de la baie de San Francisco au delta des fleuves Yukon et Kuskokwin, Alaska. Le delta de la rivière Copper, Alaska, est le point de halte le plus important et 79 % des oiseaux marqués y ont été repérés. Le second site en importance est le complexe de terres humides de la baie Willapa et de Grays Harbor au Washington. La durée moyenne de séjour au-delà des sites de marquage varie de 1,0 à 3,8 jours. Compte tenu des dates de départ, les oiseaux marqués à la baie de San Francisco se sont déplacés plus rapidement vers le delta de la Copper que ceux marqués à Grays Harbor. Plus un oiseau quitte tardivement le site de capture, plus il vole rapidement vers le delta de la Copper. La durée du séjour dans le delta de la Copper est inversement proportionnelle à la date d'arrivée. Nous n'avons décelé aucun effet du sexe sur la vitesse de déplacement, ni sur la durée de séjour. Les résultats de ce travail combiné à ceux d'une étude antérieure que nous avons faite sur le bécasseau d'Alaska, Calidris mauri (Cabanis, 1875), illustrent la variation des stratégies de migration utilisées chez une même espèce et d'une espèce à l'autre chez les oiseaux de rivage le long de la route migratoire de l'est du Pacifique.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: November 1, 2004

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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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