| Titre : | Journal of Field Ornithology 79(2) - JUN 2008 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
Kathlyn J. Mcvey, Auteur ;
Paul D. B. Skrade, Auteur ;
Tex A. Sordahl, Auteur
Communal roosts are an important aspect of Turkey Vulture (Cathartes aura) biology, but remain inadequately studied. We observed the use patterns of Turkey Vultures at a communal roost in northeastern Iowa from their arrival on 17 March 2005 to [...]
Article
Sergio A. Lambertucci, Auteur ;
Orlando A. Mastrantuoni, Auteur
The breeding behavior of Andean Condors (Vultur gryphus) is known primarily from observations of captive pairs. This species is the only sexually dimorphic one in its family (Cathartidae), permitting comparison of the parental care provided by e[...]
Article
Heloise Gonzalo-Turpin, Auteur ;
Clelia Sirami, Auteur ;
Lluis Brotons, Auteur ;
Laurent Gonzalo, Auteur ;
Jean-Louis Martin, Auteur
Recent declines in biodiversity stress the need for rigorous and reliable multispecies monitoring programs. A potential weakness of monitoring programs is a reliance on raw counts and the assumption either of complete detection or of constant de[...]
Article
Marcia A. Rocca, Auteur ;
Marlies Sazima, Auteur
In tropical ecosystems, birds play a relevant role in plant reproduction. Although hummingbirds are regarded as the most important vertebrate pollinators in the Neotropics, the possible role of perching birds as pollinators has been neglected. F[...]
Article
Sergio A. Lambertucci, Auteur ;
N. Luis Jacome, Auteur ;
Ana Trejo, Auteur
Andean Condors (Vultur gryphus) are endangered in the northern portion of their South American range, but populations are larger further south. However, throughout their range, little is known about current population sizes and dynamics. Andean [...]
Article
Harold F. Greeney, Auteur ;
Robert C. Dobbs, Auteur ;
Paul R. Martin, Auteur ;
Rudolphe A. Gelis, Auteur
Grallaria and Grallaricula antpittas are poorly known ground antbirds (Formicariidae), which reach their center of diversity in the tropical Andes region. Here we review published literature on the reproductive ecology of these two genera, summa[...]
Article
Jennifer L. Newbrey, Auteur ;
Wendy L. Reed, Auteur
Capturing breeding female blackbirds using mist nets and food-baited traps can be challenging because nets are difficult to set in wetland habitats and females feed preferentially on insects. Given the problems associated with other trapping met[...]
Article
Caren Cooper, Auteur ;
David Bonter, Auteur
To facilitate study of the breeding biology of parids, Grubb and Bronson (1995; Condor 97: 1067-1070) designed artificial "snags" made from polyvinyl chloride (PVC) tubes. Because the cost of artificial snags is greater than that of traditional [...]
Article
Brian M. Guzzetti, Auteur ;
Sandra L. Talbot, Auteur ;
David F. Tessler, Auteur ;
Verena A. Gill, Auteur ;
Edward C. Murphy, Auteur
Sexing oystercatchers in the field is difficult because males and females have identical plumage and are similar in size. Although Black Oystercatchers (Haematopus bachmani) are sexually dimorphic, using morphology to determine sex requires eith[...]
Article
E. Natasha Vanderhoff, Auteur ;
Perri K. Eason, Auteur
Juvenile birds lack the experience of adults and, as a result, are typically less efficient foragers. Environmental factors can influence how birds forage and the outcome of foraging bouts, but few investigators have considered the effects of su[...]
Article
Michael L. Peckford, Auteur ;
Philip D. Taylor, Auteur
Studies comparing numbers of nocturnal migrants in flight with numbers of migrants at stopover sites have produced equivocal results. In 2003, we compared numbers of nocturnal migrants detected by radar to numbers of passerines observed at the A[...]
Article
Sebastian T. Buckton, Auteur ;
Steve J. Ormerod, Auteur
The Himalayan Mountains have more specialist river birds than anywhere on earth, but factors permitting their coexistence have not been evaluated. We examined potential ecological segregation of five sympatric insectivores based on diet, morphol[...]
Article
Among wild birds, females expressing a male-like phenotype have rarely been documented. During a study of Bobolinks (Dolichonyx oryzivorus) in Vermont, I observed a female that changed secondary sexually selected plumage forms between breeding s[...]
Article
Xin Lu, Auteur ;
Guohong Gong, Auteur ;
Xianhai Zeng, Auteur
Most species in the genus Garrulax are found in subtropical or tropical areas of southeastern Asia, with few species adapted to temperate or high-altitude climates. We examined the behavior and reproductive ecology of Brown-cheeked Laughing Thru[...]
