| Titre : | Journal of Field Ornithology 78(3) - SEP 2007 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
Spring Ligi, Auteur ;
Kevin Omland, Auteur
Although many studies have revealed intraspecific variation in the number of broods raised per breeding season, less is known about the causes of variation between species. We monitored the breeding behavior of congeners traditionally thought to[...]
Article
Peter A. Hosner, Auteur ;
David W. Winkler, Auteur
Dispersal is a critical link between organismal and population biology, yet, because of their mobility, our understanding of the causes and consequences of long-distance dispersal by birds remains poorly known. Methods used to study dispersal in[...]
Article
Andrew Farnsworth, Auteur ;
Robert W. Russell, Auteur
Millions of birds migrate across the Gulf of Mexico each year. However, most studies of migration in this region involve sampling onshore locations during the day, potentially underrepresenting the diversity and abundance of migrants passing the[...]
Article
James A. Cox, Auteur ;
Clark D. Jones, Auteur
Prescribed burning is essential for maintaining suitable habitat for Bachman's Sparrows (Aimophila aestivalis), but burns conducted during the breeding season may lead to site abandonment and low survival or productivity. We monitored a color-ba[...]
Article
Christine M. Caron, Auteur ;
Peter W. C. Paton, Auteur
To assess population trends of Harlequin Ducks (Histrionicus histrionicus) in Rhode Island (U.S.A.), we analyzed Christmas Bird Counts and other historical surveys and also conducted surveys during the winter of 2005-2006. We estimated sex and a[...]
Article
Myron C. Baker, Auteur ;
David M. Logue, Auteur
Recordings of avian vocal signals in natural habitats include ambient noise. Often this background noise corrupts across all frequencies and is of substantial amplitude. Reducing this ambient noise to prepare vocal signals for playback stimuli o[...]
Article
David Hořák, Auteur ;
Tomáš Albrecht, Auteur
Investigators studying the relationship between egg size and young size often face difficulties in assigning particular young to particular eggs. We present a new method based on the use of separate net sacks for each egg that allowed us to stud[...]
Article
Seokwan Cheong, Auteur ;
Ha-Cheol Sung, Auteur ;
Shi-Ryong Park, Auteur
For species where males and females are monomorphic, or nearly so, determining the sex of individual birds generally requires either capturing birds or collecting samples, such as feathers, for DNA analysis. We developed a new method, involving [...]
Article
Andrew J. Pierce, Auteur ;
Korakoch Pobprasert, Auteur
A variety of photographic methods have been described for monitoring nest predation. All have limitations for studying active nests in remote situations, such as size, expense, volume of data recorded, and types of trigger mechanisms. We develop[...]
Article
Phillip Cassey, Auteur ;
John G. Ewen, Auteur ;
Rebecca L. Boulton, Auteur ;
Filiz Karadas, Auteur ;
Anders P. Moller, Auteur ;
Tim M. Blackburn, Auteur
Maternally deposited carotenoids are a prominent component of egg yolk and are vital for the development and growth of the embryo. In most studies of avian yolk carotenoids, eggs are destructively sampled and this may limit both the number of cl[...]
Article
John Faaborg, Auteur ;
Katie M. Dugger, Auteur ;
Wayne J. Arendt, Auteur
Because the winter season is potentially limiting for migratory birds, understanding their nonbreeding distributional patterns is essential. At a given site, patterns of species occurrence and abundance may vary over time and, within a species, [...]
Article
Stephanie M. Topp, Auteur ;
Lesley J. Evans Ogden, Auteur ;
Kathy Martin, Auteur
To investigate the possible effect of elevation on the prevalence of hematozoa infection, we collected blood smears from a population of Winter Wrens (Troglogytes troglodytes) in the Coast Mountains of southwestern British Columbia, Canada. We s[...]
Article
Populations of Warbling Vireos (Vireo gilvus) are declining in California, apparently due to low reproductive success. From 1989-2002, I studied the nest-site selection and reproductive success of Warbling Vireos across an elevational gradient i[...]
Article
Liliana Ayala, Auteur ;
Raul Sanchez-Scaglioni, Auteur
Two subspecies of the Wedge-rumped Storm-Petrel (Oceanodroma tethys) have been recognized, one that breeds on the Galapagos Islands (O. t. tethys) and a second that breeds on islands off the coast of Peru and Chile (O. t. kelsalli). We report a [...]
