| Titre : | Journal of Field Ornithology 78(2) - JUN 2007 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
Percy N. Hebert, Auteur ;
Richard T. Golightly, Auteur
Unlike other alcids, Marbled Murrelets (Brachyramphus marmoratus) typically nest solitarily on large platforms in the upper canopy of old-growth coniferous trees. Although Marbled Murrelets exhibit characteristics that minimize the risk of preda[...]
Article
Mark Bolton, Auteur ;
Nigel Butcher, Auteur ;
Fiona Sharpe, Auteur ;
Danae Stevens, Auteur ;
Gareth Fisher, Auteur
Although cameras have been used for many years to collect data at birds' nests, recent advances in digital technology have led to increased storage capacity, faster and easier review of data, and reduced power consumption. The development of sop[...]
Article
Jacob E. Kubel, Auteur ;
Richard H. Yahner, Auteur
Use of point-count data to estimate population sizes of North American landbirds may be challenged by limitations on detection probability of particular species, thereby requiring correction factors to ensure accurate estimates. We estimated det[...]
Article
S. Erin Whidden, Auteur ;
Cory T. Williams, Auteur ;
Andre R. Breton, Auteur ;
C. Loren Buck, Auteur
Although radiotelemetry is useful for monitoring nest attendance and the foraging ranges and distribution of breeding birds, attachment of transmitters may affect reproductive behavior. In 2003, we captured 25 adult Tufted Puffins (Fratercula ci[...]
Article
Catherine S. Wightman, Auteur ;
Stephen S. Germaine, Auteur ;
Paul Beier, Auteur
There is growing recognition of the need to conserve areas used by birds during migration, including forest and upland habitats. Because extensive thinning and burning treatments are planned for ponderosa pine (Pinus ponderosa) forests in the so[...]
Article
Greg D. Matuzak, Auteur ;
Donald J. Brightsmith, Auteur
Many parrot populations are threatened with extinction due to habitat loss and collection for the pet trade. The loss of nest trees and chick poaching can drastically reduce reproductive success. However, due to the long life span of many parrot[...]
Article
David Westmoreland, Auteur ;
Matthew Schmitz, Auteur ;
Kevin E. Burns, Auteur
Avian embryos are incubated at temperatures only 2-6 degrees C below that at which hyperthermia begins to influence survival. In habitats where sunlight directly strikes the eggs, even for short periods, heat gain may be a substantial threat to [...]
Article
Selena Humphreys, Auteur ;
Chris S. Elphick, Auteur ;
Carina Gjerdrum, Auteur ;
Margaret Rubega, Auteur
Saltmarsh Sharp-tailed Sparrows (Ammodramus caudacutus) build ground nests, often with a closely-woven dome, in marshes that frequently flood during high tides. To test the hypothesis that domed nests help reduce the loss of eggs and chicks due [...]
Article
Boris Rios-Uzeda, Auteur ;
Robert B. Wallace, Auteur
Population estimates of Andean Condors (Vultur gryphus) are urgently needed across their range to more accurately assess their conservation status and design appropriate conservation measures. From July to September 2005, six feeding stations in[...]
Article
John H. Giudice, Auteur ;
Kurt J. Haroldson, Auteur
Evidence that the Conservation Reserve Program (CRP) has resulted in large-scale increases in populations of grassland birds is limited. Detecting large-scale CRP effects is difficult because agricultural landscapes are complex, dynamic systems [...]
Article
C. Dustin Becker, Auteur ;
Elizabeth A. Richardson, Auteur ;
Susan J. Brown, Auteur
To reveal more clearly the places that are critical for generating and sustaining species diversity, the distribution of genetic diversity is informative for conservation. Evolutionary significant units (ESUs) represent distinct lineages within [...]
Article
Robert C. Dobbs, Auteur ;
T. Scott Sillett, Auteur ;
Nicholas L. Rodenhouse, Auteur ;
Richard T. Holmes, Auteur
Foraging behavior often reflects food availability, a resource that may increasingly limit breeding birds as intraspecific crowding increases. Measuring foraging behavior, therefore, provides a way to investigate effects of population density on[...]
Article
John A. Reed, Auteur ;
Paul L. Flint, Auteur
We studied the movements and foraging effort of radio-marked Steller's Eiders (Polysticta stelleri) and Harlequin Ducks (Histrionicus histrionicus) to evaluate habitat quality in an area impacted by industrial activity near Dutch Harbor, Alaska.[...]
