| Titre : | Journal of Field Ornithology 92(2) - June, 2021 |
| Type de document : | Bulletin |
| Paru le : | 01/06/2021 |
Dépouillements
Article
David L. Swanson, Auteur ;
Reza Goljani Amirkhiz, Auteur
Anecdotal observations of mid-summer arrival of Blue Grosbeaks (Passerina caerulea) in South Dakota, in the northern portion of their breeding range, suggest that this species may show a pattern of arrival at the northern breeding grounds that d[...]
Article
Sean M. Mahoney, Auteur ;
Bret Pasch, Auteur ;
Tad C. Theimer, Auteur
Animals use acoustic signals to repel competitors and attract mates, and signal divergence among populations can promote reproductive isolation. Empidonax flycatchers are insectivorous songbirds distributed across North and Central America that [...]
Article
Seth W. Judge, Auteur ;
Christopher C. Warren, Auteur ;
Richard J. Camp, Auteur ;
Laura K. Berthold, Auteur ;
Hanna L. Mounce, Auteur ;
Patrick J. Hart, Auteur ;
Ryan J. Monello, Auteur
Population monitoring is critical for informing the management and conservation of rare Hawaiian forest birds. In 2017, we used point-transect distance sampling methods to estimate population densities of birds on Haleakalā Volcano on east Maui [...]
Article
Augusto Florisvaldo Batisteli, Auteur ;
Hugo Sarmento, Auteur ;
Marco Aurélio Pizo, Auteur
Selection of safe nest sites is a first step toward improving the chances of breeding successfully. Reusing old nests can save time and energy for breeding birds, but nest reuse is rare among open-cup nesting songbirds and the factors contributi[...]
Article
Katherine B. Feldmann, Auteur ;
Kathryn C. Grabenstein, Auteur ;
Scott A. Taylor, Auteur
Feather coloration and patterning are major signals influencing mate choice within and between species. However, most studies of the role of plumage in mate choice have focused on colorful species with obvious sexual dichromatism. To better unde[...]
Article
Daniel R. Ruthrauff, Auteur ;
Christopher M. Harwood, Auteur ;
T. Lee Tibbitts, Auteur ;
Nils Warnock, Auteur ;
Robert E. Gill, Auteur
Birds that conduct long-distance migrations exhibit varied patterns of consistency in migratory timing and site use. Understanding variation in these traits among populations can help uncover mechanisms driving migratory behaviors and identify p[...]
Article
Amy L. Scarpignato, Auteur ;
Kristie A. Stein, Auteur ;
Emily B. Cohen, Auteur ;
Peter P. Marra, Auteur ;
Laura J. Kearns, Auteur ;
Sara Hallager, Auteur ;
Christopher M. Tonra, Auteur
An understanding of the full annual cycle distributions of bird populations is a prerequisite to elucidating the drivers of differing trends among breeding populations. In the United States, Black-crowned Night-Herons (Nycticorax nycticorax) are[...]
