| Titre : | Journal of Field Ornithology 81(1) - MAR 2010 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
Chiyeung Choi, Auteur ;
Ning Hua, Auteur ;
Christer Persson, Auteur ;
Chungyu Chiang, Auteur ;
Zhijun Ma, Auteur
For some populations of Dunlins (Calidris alpina), determining the age of individuals on the nonbreeding grounds can be difficult. This difficulty arises in part because some populations undergo their primary molt during the boreal summer, leavi[...]
Article
Maria E. Pereyra, Auteur ;
Martin L. Morton, Auteur
Flight-song displays usually include distinctive vocalizations and behaviors that are probably energetically expensive and also likely to attract the attention of aerial predators. We observed flight songs performed by Dusky Flycatchers (Empidon[...]
Article
Margret I. Hatch, Auteur ;
Robert J. Smith, Auteur
Hematocrits may provide information about the physiological condition of birds, but, to be a useful measure, information is needed concerning how hematocrits vary among individuals and over time. We examined the repeatability of hematocrits in a[...]
Article
Qiang Liu, Auteur ;
Junxing Yang, Auteur ;
Xiaojun Yang, Auteur ;
Jianlin Zhao, Auteur ;
Hongzhong Yu, Auteur
One of the most endangered populations of Black-necked Cranes (Grus nigricollis), the central population, is declining due to habitat loss and degradation, but little is known about their space use patterns and habitat preferences. We examined t[...]
Article
Chase D. Mendenhall, Auteur ;
Çagan H. Sekercioglu, Auteur ;
Federico Oviedo Brenes, Auteur
Field methods for determining the sex of birds are often limited due to morphometric overlap between sexes, intermediate plumages, seasonality, and reliance on subjective age classification. Interpubic distance, characterized in birds as the dis[...]
Article
Troy G. Murphy, Auteur ;
Vanya G. Rohwer, Auteur ;
Edwin Scholes, Auteur
Motmots, with their distinctive racketed-tails, represent one of the most easily recognized tropical birds, yet little is known about the basic natural history of most species in the family Momotidae. We report basic breeding biology and longevi[...]
Article
Ken Yasukawa, Auteur ;
David A. Enstrom, Auteur ;
Patricia G. Parker, Auteur ;
Thomas C. Jones, Auteur
The epaulets of male Red-winged Blackbirds (Agelaius phoeniceus) are frequently cited as a sexually selected plumage ornament, but a number of laboratory and field studies provide little evidence that they are currently experiencing sexual selec[...]
Article
Ricardo Canales-del Castillo, Auteur ;
José I. González-Rojas, Auteur ;
Irene Ruvalcaba-Ortega, Auteur ;
Angel Garcia-Ramirez, Auteur
Worthen's Sparrows (Spizella wortheni) are endemic to the Mexican Plateau and have been listed as globally endangered. The breeding biology of these sparrows is poorly understood, and nesting is only known to occur at three locations (Las Espera[...]
Article
Erich Fischer, Auteur ;
Roberto L. Munin, Auteur ;
Jose M. Longo, Auteur ;
Wagner Fischer, Auteur ;
Paulo R. de Souza, Auteur
Great Kiskadees (Pitangus sulphuratus) are found in a variety of habitats from Argentina north to the United States and are the most generalist tyrant flycatcher in both foraging behavior and food habits. These kiskadees are known to occasionall[...]
Article
Article
Ellie Owen, Auteur ;
Francis Daunt, Auteur ;
Sarah Wanless, Auteur
Adipose tissue samples can provide valuable information about the physiology, foraging ecology, and toxicology of birds. However, despite these varied applications, to date, no procedure for taking adipose samples from live birds has been descri[...]
Article
Jessica L. Hardesty, Auteur ;
Kevin C. Fraser, Auteur
Altitudinal migration by birds in the tropics is poorly described and the migratory patterns of many species remain unknown. Stable-isotope analysis may be a suitable method for tracking elevational movements. Globally, stable-hydrogen isotope ([...]
Article
Benjamin J. O'Neal, Auteur ;
Joshua D. Stafford, Auteur ;
Ronald P. Larkin, Auteur
Local and migratory movements aloft have important implications for the ecology and conservation of birds, but are difficult to quantify. Weather surveillance radar (WSR) offers a unique tool for observing movements of birds, but until now has b[...]
