| Titre : | Journal of Field Ornithology 78(4) - DEC 2007 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
Patrick J. Weatherhead, Auteur ;
Katherine E. Muma, Auteur ;
J. Dylan Maddox, Auteur ;
Jenny M. Knox, Auteur ;
Kevin W. Dufour, Auteur
Past studies of offspring sex ratios in birds have often relied on sexually size dimorphic species where nestling sex could be determined based on weight at a given age. DNA-based sexing techniques allow us to assess the accuracy of those techni[...]
Article
Many passerine species exhibit a "dawn chorus"-a bout of intense singing activity before or at dawn, but our understanding of this phenomenon is poor. Tyrant flycatchers (Tyrannidae) exhibit pronounced daily bouts of dawn singing. I documented t[...]
Article
Brandon L. Noel, Auteur ;
C. Ray Chandler, Auteur ;
Brad Winn, Auteur
Although breeding populations of Piping Plovers are well studied, their winter distribution is less clear. We studied the seasonal abundance of nonbreeding Piping Plovers (Charadrius melodus) during the winters of 2003-2004 and 2004-2005 on Litt[...]
Article
Bertram G. Murray, Auteur ;
Val Nolan, Auteur
Few investigators have examined how a female's prior history (i.e., number of clutches laid previously and whether those nesting attempts were successful or not) might influence the success of a particular clutch. Our objective was to determine [...]
Article
Cory T. Williams, Auteur ;
S. Dean Kildaw, Auteur ;
C. Loren Buck, Auteur
Reduced prey availability can affect the growth and survival of nestling seabirds. However, few studies have demonstrated similar effects on indices of adult body condition. We examined body condition and seasonal mass loss of breeding adult mal[...]
Article
Sharyn L. Hood, Auteur ;
Stephen J. Dinsmore, Auteur
Snowy Plovers (Charadrius alexandrinus) and Wilson's Plovers (C. wilsonia) are shorebird species of increasing conservation concern, with populations apparently declining in North America. However, estimates of current populations are needed bef[...]
Article
Alan D. Maccarone, Auteur ;
John N. Brzorad, Auteur
Wading birds may use different foraging methods and prey capture techniques in particular habitats or under specific conditions. We measured foraging behavior and its energetic costs for Great Egrets (Ardea alba) and Snowy Egrets (Egretta thula)[...]
Article
Scott A. Rush, Auteur ;
Robert J. Cooper, Auteur ;
Mark S. Woodrey, Auteur
Estimates of nest survival rate are often based on the assumption that the rate is constant during the nest cycle. Because violating this assumption can generate biased estimates, determining the age of a nest is important. For precocial marsh b[...]
Article
Kim Patten, Auteur ;
Carol O'Casey, Auteur
Over the past 15 yr, an invasive cordgrass, Spartina alterniflora, has covered more than 5000 ha of tidal mudflats in Willapa Bay, Washington, threatening key shorebird habitat on the Pacific Flyway. Although chemical and mechanical control meth[...]
Article
Geoffrey M. Carter, Auteur ;
Mike L. Legare, Auteur ;
David R. Breininger, Auteur ;
Donna M. Oddy, Auteur
Population declines among birds are often linked to habitat change and associated increases in nest predation rates. In species of conservation concern identifying nest predators is an important first step in developing management strategies to [...]
Article
Kevin Ellison, Auteur ;
Spencer G. Sealy, Auteur
Brood parasites often must overcome host defenses that may include behaviors that serve other functions, such as deterrence of predators and nest attendance during laying and incubation. Host use by brood parasites may also be influenced by comp[...]
Article
Antony W. Diamond, Auteur ;
V. C. Fayad, Auteur ;
Peter S. McKinley, Auteur
Article
Antje Muellner, Auteur ;
K. Eduard Linsenmair, Auteur
Hoatzins (Opisthocomus hoazin) are the only member of the family Opisthocomidae and are found only in forests in the Amazon and Orinoco river basin of South America. Although locally common in riparian habitats, information about their natural h[...]
