| Titre : | Journal of Field Ornithology 81(4) - DEC 2010 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
Mark A. Colwell, Auteur ;
Noah S. Burrell, Auteur ;
Michael A. Hardy, Auteur ;
Kimiko Kayano, Auteur ;
Jordan J. Muir, Auteur ;
Wendy J. Pearson, Auteur ;
Sara A. Peterson, Auteur ;
Kristin A. Sesser, Auteur
Habitat quality, as indexed by the reproductive success of individuals, can greatly influence population growth, especially for rare species near the limits of their range. Along the Pacific coast, the Snowy Plover (Charadrius alexandrinus nivos[...]
Article
Frédéric Jiguet, Auteur ;
Morgane Barbet-Massin, Auteur ;
Pierre-Yves Henry, Auteur
Conservation of rare, elusive species is difficult because of limited knowledge of their biology and distribution. The two species of Doliornis cotingas are known from 7 (Chestnut-bellied Cotinga, D. remseni) and 13 (Bay-vented Cotinga, Doliorni[...]
Article
Teresa J. Lorenz, Auteur ;
Kimberly A. Sullivan, Auteur
Clark's Nutcrackers (Nucifraga columbiana) disperse seeds of whitebark pines (Pinus albicaulis) in western North America by their scatter-hoarding behavior. Because of declines in whitebark pine, resource managers are seeking an effective means [...]
Article
M. Clay Green, Auteur ;
Paul Leberg, Auteur ;
Margaret Luent, Auteur
Estimating the number of waterbird colonies in a given area can have important conservation implications, including assessment of the regional or global importance of an area and the impacts of conservation efforts (e. g., habitat restoration) a[...]
Article
P. Dee Boersma, Auteur ;
Ginger A. Rebstock, Auteur
Egg volume is often calculated from length and breadth, assuming little variation in egg shape within species. However, egg shape may vary among females, over time, or within clutches. If this variation is not predictable, volume should be estim[...]
Article
Bruce A. Robertson, Auteur ;
Richard L. Hutto, Auteur ;
Joseph J. Fontaine, Auteur
The use of aural surveys to estimate population parameters is widespread in avian studies. Despite efforts to increase the efficacy of this method, the potential for ecological context to bias population estimates remains largely unexplored. For[...]
Article
On the breeding grounds, migratory birds have limited time to breed and molt before autumn migration. However, few studies of long-distance migrants have examined the phenology of these events to determine what life-history trade-offs might resu[...]
Article
Branislav Igic, Auteur ;
Mark E. Hauber, Auteur ;
Josic A. Galbraith, Auteur ;
Tomáš Grim, Auteur ;
Donald C. Dearborn, Auteur ;
Patricia L. R. Brennan, Auteur ;
Csaba Moskát, Auteur ;
Pankaj K. Choudhary, Auteur ;
Phillip Cassey, Auteur
The study of avian eggshell structure, including composition, pigmentation, thickness, and strength, has important ecological and economic implications. Previous investigators have used a variety of techniques to derive either direct measures or[...]
Article
Alex E. Jahn, Auteur ;
DOUGLAS J. LEVEY, Auteur ;
Ana Maria Mamani, Auteur ;
Mirtha Saldias, Auteur ;
Angelica Alcoba, Auteur ;
Maria Julieta Ledezma, Auteur ;
Betty Flores, Auteur ;
Julian Quillen Vidoz, Auteur ;
Fabian Hilarion, Auteur
Little is known about the relationship between seasonal food availability and the foraging strategies of insectivorous Neotropical birds. We studied a population of Tropical Kingbirds (Tyrannus melancholicus), a primarily insectivorous species, [...]
Article
John N. Mager, Auteur ;
Charles Walcott, Auteur ;
Walter H. Piper, Auteur
Although previous studies have identified elements of the yodel calls of male Common Loons (Gavia immer) that might be important for neighbor/non-neighbor discrimination, no one to date has determined whether loons can distinguish between the yo[...]
Article
Cheri L. Gratto-Trevor, Auteur ;
J. Paul Goossen, Auteur ;
Sharilyn M. Westworth, Auteur
Age of first breeding is an important life history trait. Many Piping Plovers (Charadrius melodus) do not breed as yearlings, but little information is available concerning the age of first breeding. From 2000 to 2006, we marked 991 chicks in th[...]
Article
Andrew Wilson, Auteur ;
Margaret Brittingham, Auteur ;
Greg Grove, Auteur
Conservation grasslands can provide valuable habitat resource for breeding songbirds, but their value for wintering raptors has received little attention. We hypothesized that increased availability of grassland habitat through the Conservation [...]
