| Titre : | Journal of Field Ornithology 88(1) - March, 2017 |
| Type de document : | Bulletin |
| Paru le : | 01/03/2017 |
Dépouillements
Article
Laura Cárdenas-Ortíz, Auteur ;
Nicholas J. Bayly, Auteur ;
Gabriel J. Colorado Z., Auteur ;
Keith A. Hobson, Auteur
Canada Warblers (Cardellina canadensis) are long-distance Neotropical migrants, but little is known about their migratory behavior and ecology. We examined the fall migration of Canada Warblers at two sites, Darién and the Sierra Nevada de Santa[...]
Article
L. Scott Johnson, Auteur ;
Andre V. Nguyen, Auteur ;
Chelsea L. Connor, Auteur
What causes young birds to leave nests remains unclear for almost all altricial species. For many years, the assumption was that parents often controlled the time of fledging by coaxing young from nests, e.g., by holding food within view, but ou[...]
Article
Lori Hargrove, Auteur ;
Philip Unitt, Auteur
Since the 1940s, populations of Gray Vireos (Vireo vicinior) in California have collapsed, presumably because of parasitism by Brown-headed Cowbirds (Molothrus ater). In 2012 and 2013, we studied the vireo's nesting ecology to assess factors aff[...]
Article
Effects of point-count duration on estimated detection probabilities and occupancy of breeding birds
Matthias Leu, Auteur ;
Matthew L. Farnsworth, Auteur ;
Erica Fleishman, Auteur ;
David S. Dobkin, Auteur ;
Rick D. Scherer, Auteur ;
Barry R. Noon, Auteur ;
Brett G. Dickson, Auteur
Increasingly, point-count data are used to estimate occupancy, the probability that a species is present at a given location; occupancy accounts for imperfect detection, the probability that a species is detected given that it is present. To our[...]
Article
Juan M. Girini, Auteur ;
Facundo X. Palacio, Auteur ;
Patricia V. Zelaya, Auteur
Strix (Strigidae) is a worldwide genus of 17 owl species typical of forested habitats, including Rusty-barred Owls (S. hylophila), Chaco Owls (S. chacoensis), and Rufous-legged Owls (S. rufipes) in South America. These species are distributed al[...]
Article
Emily A. McKinnon, Auteur ;
T. Kurt Kyser, Auteur ;
Bridget J. M. Stutchbury, Auteur
Many migratory songbirds switch from a primarily insectivorous diet during the breeding season to either a mixed diet or fruit diet during the non-breeding season. However, for species with mixed diets, arthropods may be superior food items beca[...]
Article
Andrew K. Wiegardt, Auteur ;
Daniel C. Barton, Auteur ;
Jared D. Wolfe, Auteur
Molt is an energetically costly process, and songbirds (Order Passeriformes) exhibit a diversity of strategies to maximize their survival and reproductive success while meeting the energetic demands of the annual prebasic molt. Nearctic-Neotropi[...]
Article
Allison K. Pierce, Auteur ;
Stephen J. Dinsmore, Auteur ;
Dennis Jorgensen, Auteur ;
Michael B. Wunder, Auteur
Understanding the migratory movements and habitats used during the annual cycle of migrants is essential to developing comprehensive conservation strategies. Mountain Plovers (Charadrius montanus) are short-distance migrants listed as a species [...]
