| Titre : | Journal of Field Ornithology 77(3) - SUM 2006 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
Daniel R. Ardia, Auteur ;
Jonathan H. Perez, Auteur ;
Ethan D. Clotfelter, Auteur
Orientation of nests can influence nest microclimate, particularly temperature. However, few investigators have examined orientation preference and microclimate simultaneously. We examined the possible correlation between entrance orientation of[...]
Article
Mark G. Pollock, Auteur ;
Eben H. Paxton, Auteur
Banding birds is essential for detailed demographic studies of avian populations. Mist nets are a widely used, effective method of capturing birds for banding, but are difficult to use under certain conditions. While conducting a demographic stu[...]
Article
Carina Gjerdrum, Auteur ;
Gregor M. Yanega, Auteur ;
Douglas F. Bertram, Auteur
For burrow-nesting seabirds, investigators have examined nestling diet by attaching harnesses to the bills of nestlings; to intercept food delivered by the parent. To determine whether this method provides an unbiased estimate of nestling diet, [...]
Article
Sidney A. Gauthreaux, Auteur ;
John W. Livingston, Auteur
Previous studies using thermal imaging cameras (TI) have used target size as an indicator of target altitude when radar was not available, C this approach may lead to errors if birds that differ greatly in size are actually flying at the same al[...]
Article
Sylvain Bonifait, Auteur ;
Marc-Andre Villard, Auteur ;
David Paulin, Auteur
Various indices of reproductive activity (IRA) have been used to estimate the reproductive success of songbirds. However, the performance of IRAs varies among systems examined, and this approach still requires more effort than standard surveys. [...]
Article
Raptors and other large birds in soaring flight take advantage of upward drafts of air called thermals to maintain altitude with minimal flapping. I us;e a Doppler light detection and ranging (lidar) system to characterize a thermal in which rap[...]
Article
Justin L. Rasmussen, Auteur ;
Spencer G. Sealy, Auteur
Brown-headed Cowbirds (Molothrus ater) impose costs on their hosts, usually resulting in fewer or no host young being raised. In 95% of the studies where attempts were made to estimate the cost of parasitism, cost was measured as the difference [...]
Article
Charles T. Collins, Auteur ;
Paul F. Doherty, Auteur
Once the most abundant large tern in California, populations of Royal Terns (Thalasseus Maximus) are now greatly reduced statewide. However, these terns are still common in southern California where the population appears to be increasing. We es[...]
Article
Heather M. Renner, Auteur ;
Brian J. McCaffery, Auteur
The nesting biology of the Eastern Yellow Wagtail (Motacilla tschutschensis) was studied at Cape Romanzof, Alaska, an arctic tundra site on the Bering Sea coast near the northeastern limit of the breeding distribution of the Yellow Wagtail (Mota[...]
Article
Eugene Sillar Morton, Auteur ;
Joan Howlett, Auteur ;
Nicole Christine Kopysh, Auteur ;
Ioana Chiver, Auteur
Mechanisms used by birds to rang their distance from singing conspecifics are being debated. In particular, the idea that an incoming song must be in a bird's repertoire for it to be ranged accurately is controversial, but important to our appre[...]
Article
Courtney J. Conway, Auteur ;
Victoria Garcia, Auteur ;
Matthew D. Smith, Auteur ;
Lisa A. Ellis, Auteur ;
Joyce L. Whitney, Auteur
Anecdotal evidence suggests that Burrowing Owls have declined in the state of Washington. We examined the status of these owls in agricultural and urban habitats to better understand the underlying causes of these declines. Nest density was high[...]
Article
Adrian S. Di Giacomo, Auteur ;
Alejandro G. Di Giacomo, Auteur
Birds in Neotropical forests frequently follow army ants to forage for insects. Here we report the first record of several species of Neotropical grassland birds following army ants (Labidus praedator) and yellow armadillos (Euphractus sexcinctu[...]
Article
Sexual size dimorphism (SSD) may be due to sexual and natural selection, but identifying specific mechanisms that generate such dimorphism in a species is difficult. I examined SSD in Carolina Wrens (Thryothorus ludovicianus) by examining (1) th[...]
Article
On 28 October 1996, 1 found a Mottled Piculet (Picumnus nebulosus) nest on Anhangava Mountain in southern Brazil. The nest cavity (10.6 cm X 5.6 cm) was in the trunk of a dead tree at a height of 85 cm. The circumference of the trunk at cavity h[...]
Article
David I. King, Auteur ;
Richard M. DeGraaf, Auteur
Nest predation is the primary cause of nest failure in most passerine birds, and increases in nest predation associated with anthropogenic habitat disturbance are invoked as explanations for population declines of some bird species. In most case[...]
