| Titre : | Journal of Field Ornithology 79(4) - DEC 2008 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
Sarah J. K. Frey, Auteur ;
Christopher C. Rimmer, Auteur ;
Kent P. McFarland, Auteur ;
Stephane Menu, Auteur
The similar plumage of Bicknell's (Catharus bicknelli) and Gray-cheeked (C. minimus) Thrushes have hindered attempts to better understand the nonbreeding biology of these species. We used morphometric data, specifically primary formulae, from Bi[...]
Article
Thomas F. Fondell, Auteur ;
James B. Grand, Auteur ;
David A. Miller, Auteur ;
R. Michael Anthony, Auteur
The population of Dusky Canada Geese (Branta canadensis occidentalis) has been in long-term decline, likely due to reduced breeding productivity. To identify causes of mortality, we monitored goslings marked with radio transmitters on the wester[...]
Article
David W. DesRochers, Auteur ;
Hugo K. W. Gee, Auteur ;
J. Michael Reed, Auteur
Accurate population surveys are critical for effective management of species of conservation concern. Traditional visual and aural surveys are ineffective for behaviorally cryptic species such as rails, but incorporating call-broadcast into surv[...]
Article
Christina Riehl, Auteur ;
Glenn S. Adelson, Auteur
Fruit-eating birds are important seed dispersers in tropical forests, but little is known about the extent to which they rely on insects or how their diets vary seasonally. We used field observations of focal adults to quantify the diets of adul[...]
Article
Peter S. Coates, Auteur ;
John W. Connelly, Auteur ;
David J. Delehanty, Auteur
Nest predation is the primary cause of nest failure for Greater Sage-Grouse (Centrocercus urophasianus), but the identity of their nest predators is often uncertain. Confirming the identity of these predators may be useful in enhancing managemen[...]
Article
Kathryn A. Williams, Auteur ;
Peter C. Frederick, Auteur ;
Paul S. Kubilis, Auteur ;
John C. Simon, Auteur
Estimating detection error, as well as the magnitude of other potential survey biases, is essential when sampling efforts play a role in the estimation of population size and management of wildlife populations. We quantified visual biases in aer[...]
Article
William C. Holimon, Auteur ;
C. Theo Witsell, Auteur ;
William H. Baltosser, Auteur ;
Catherine W. Rideout, Auteur
Although the habitat requirements of breeding populations of Henslow's Sparrow (Ammodramus henslowii) have been examined, less is known about their habitat requirements and ecology during the nonbreeding season. We estimated population densities[...]
Article
Effect of investigator disturbance on corticosterone concentrations of Black-legged Kittiwake chicks
John H. Brewer, Auteur ;
Kathleen M. O'Reilly, Auteur ;
C. Loren Buck, Auteur
Recent studies indicate that young seabird chicks exposed to relatively short periods of elevated levels of plasma corticosterone may suffer lifelong cognitive impairment that is detrimental to their survivorship and fitness as adults. We examin[...]
Article
Matthew E. Reiter, Auteur ;
David E. Andersen, Auteur
Both egg flotation and egg candling have been used to estimate incubation day (often termed nest age) in nesting birds, but little is known about the relative accuracy of these two techniques. We used both egg flotation and egg candling to estim[...]
Article
Entre Rios Seedeaters (Sporophila zelichi), also called Zelich's Seedeaters, White-collared Seedeaters, and Narosky's Seedeaters, are one of the rarest birds in the Neotropics. However, doubts have been raised about the validity of this species.[...]
Article
Orien M. Richmond, Auteur ;
Jerry Tecklin, Auteur ;
Steven R. Beissinger, Auteur
California Black Rails (Laterallus jamaicensis coturniculus) have a disjunct and poorly understood distribution. After a new population was discovered in Yuba County in 1994, we conducted call playback surveys from 1994 to 2006 in the Sierra foo[...]
Article
Davina L. Hill, Auteur ;
Hugo Aranibar-Rojas, Auteur ;
Ross Macleod, Auteur
The Wattled Curassow (Crax globulosa) is a globally threatened species restricted to humid varzea forest (seasonally flooded forest along white-water rivers) in low-lying regions of Amazonia. The Wattled Curassow were thought to have been extirp[...]
