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Documents disponibles écrits par cet auteur (6)
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Article
Dominique Chabot, Auteur ; Charles M. Francis, AuteurBird surveys conducted using aerial images can be more accurate than those using airborne observers, but can also be more time-consuming if images must be analyzed manually. Recent advances in digital cameras and image-analysis software offer un[...]
Article
Bradley K. Woodworth, Auteur ; Greg W. Mitchell, Auteur ; D. Ryan Norris, Auteur ; Charles M. Francis, Auteur ; Philip D. Taylor, AuteurDeparture decisions of songbirds at ecological barriers they encounter en route can strongly influence time, energy and survival costs of migration. To date, most field studies of departure decisions and their correlates have used indirect metho[...]
Article
Robert S. Rempel, Auteur ; Charles M. Francis, Auteur ; Jeffrey N. Robinson, Auteur ; Margaret Campbell, AuteurAcoustic recording systems are being used more frequently to estimate habitat occupancy or relative abundance, and to monitor population trends over time. A potential concern with digital recording systems is that changes in technology could aff[...]
Article
Anthony J. Gaston, Auteur ; Charles M. Francis, Auteur ; Ian C. T. Nisbet, AuteurUse of soft-metal (aluminum alloy) bands on gulls (Laridae) is known to result in high rates of band loss and, as a result, hard-metal (monel, incoloy, or stainless steel) bands are superior for most studies. However, the U.S. Bird Banding Labor[...]
Article
Bradley K. Woodworth, Auteur ; Charles M. Francis, Auteur ; Philip D. Taylor, AuteurInland dispersal of migrating land birds away from the coast, often opposite to the direction of migration, occurs frequently. Many of these movements may involve migrants seeking improved stopover conditions farther inland, but direct study of [...]
Article
Margaret Campbell, Auteur ; Charles M. Francis, AuteurPoint count surveys are widely used for monitoring songbird populations, but little is known of the effect of the observer on songbird behavior during point counts. We used a novel, wireless array of recorders to determine the location of singin[...]
