| Titre : | Journal of Field Ornithology 78(1) - WIN 2007 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
Kristina Cockle, Auteur ;
Gabriel Capuzzi, Auteur ;
Alejandro Bodrati, Auteur ;
Rob Clay, Auteur ;
Hugo del Castillo, Auteur ;
Myriam Velazquez, Auteur ;
Juan I. Areta, Auteur ;
Nestor Farina, Auteur ;
Rodrigo Farina, Auteur
Vinaceous Amazons (Amazona vinacea) are endemic to the Atlantic forest of southeastern Brazil, eastern Paraguay, and the province of Misiones in Argentina. We searched for Vinaceous Amazons throughout the western part of its range in Argentina a[...]
Article
Eli S. Bridge, Auteur ;
Raoul K. Boughton, Auteur ;
Robert A. Aldredge, Auteur ;
Timothy J. E. Harrison, Auteur ;
Reed Bowman, Auteur ;
Stephan J. Schoech, Auteur
Egg volumes are most often estimated using a mathematical model that incorporates length and width measurements and a species-specific shape variable. Although adequate in many respects, this technique does not account for intraspecific variatio[...]
Article
Christopher E. Moorman, Auteur ;
Liessa T. Bowen, Auteur ;
John C. Kilgo, Auteur ;
Clyde E. Sorenson, Auteur ;
James L. Hanula, Auteur ;
Scott Horn, Auteur ;
Mike D. Ulyshen, Auteur
Little is known about how insectivorous bird diets are influenced by arthropod availability and about how these relationships vary seasonally. We captured birds in forest-canopy gaps and adjacent mature forest during 2001 and 2002 at the Savanna[...]
Article
John R. Probst, Auteur ;
Deahn M. Donner, Auteur ;
Michael A. Bozek, Auteur
The ability to age individual birds visually in the field based on plumage variation could provide important demographic and biogeographical information. We describe an approach to infer ages from a distribution of plumage scores of free-ranging[...]
Article
Karl S. Berg, Auteur ;
Jacqueline Socola, Auteur ;
Rafael R. Angel, Auteur
The Great Green Macaw (Ara ambiguus) is one of the largest New World parrots and is considered endangered with extinction. Their precarious decline in western Ecuador has been attributed to food scarcity, among other pressures. To understand the[...]
Article
Robert W. Fridinger, Auteur ;
Kathleen M. O'Reilly, Auteur ;
S. Dean Kildaw, Auteur ;
C. Loren Buck, Auteur
Plasma corticosterone concentrations in birds often increase about 3 min after exposure to a stressor such as capture and handling. When measuring adrenal responsiveness of nestlings in broods with more than one nestling, standardizing capture p[...]
Article
Daniel P. Huebner, Auteur ;
Sarah R. Hurteau, Auteur
Inspection of cavity nests and nest boxes is often required during studies of cavity-nesting birds, and fiberscopes and pole-mounted video cameras are sometimes used for such inspection. However, the cost of these systems may be prohibitive for [...]
Article
Travis L. Booms, Auteur ;
Brian J. McCaffery, Auteur
Double-observer methodology requires independent collection of data to accurately estimate population parameters. Use of visual nest markers to facilitate matching, relocating, and monitoring nests as part of a double-observer study violates thi[...]
Article
Jason L. Schamber, Auteur ;
James S. Sedinger, Auteur ;
David H. Ward, Auteur ;
Kate R. Hagmeier, Auteur
Latitudinal variation in population structure during the winter has been reported in many migratory birds, but has been documented in few species of waterfowl. Variation in environmental and social conditions at wintering sites can potentially i[...]
Article
Evan M. Rehm, Auteur ;
Guy A. Baldassarre, Auteur
The decline in populations of several species of marsh birds in North America has prompted development of a monitoring protocol that involves the broadcast of conspecific calls to enhance detection of these secretive species. However, with a sta[...]
Article
Kristen B. Gorman, Auteur ;
Paul L. Flint, Auteur ;
Daniel Esler, Auteur ;
Tony D. Williams, Auteur
Studies of female waterfowl nutrient reserve use during egg production require a precise understanding of ovarian follicle dynamics to correctly interpret breeding status, and, therefore, derive proper inference. Concerns over numerical declines[...]
Article
Joseph J. Nocera, Auteur ;
Trina M. Fitzgerald, Auteur ;
Alan R. Hanson, Auteur ;
G. Randy Milton, Auteur
Nelson's Sharp-tailed Sparrows (Ammodramus nelsoni) that breed along the Atlantic coast of North America (Acadian subspecies subvirgatus) are considered saltmarsh specialists. However, these sparrows occasionally use upland habitats, such as hay[...]
Article
Bridget J. M. Stutchbury, Auteur ;
Eugene S. Morton, Auteur ;
Bonnie Woolfenden, Auteur
Little is known about the genetic mating systems of tropical passerines and how they vary among species. We studied the Lesser Elaenia (Elaenia chiriquensis) and the Yellow-bellied Elaenia (E. flavogaster) near Gamboa, Panama. These species bree[...]
