Contents
Direct and Indirect Effects of Peregrine Falcon Predation on Seabird Abundance
R. T. Paine, J. T. Wootton, and P. D. Boersma
Incubation Temperatures and Behavior of Crowned, Black-winged, and Lesser Black-winged Plovers
David Ward
Summertime Activity Budgets of Hatching-year Mourning Doves
Michael P. Losito, Ralph E. Mirarchi, and Guy A. Baldassarre
Body Morphometrics, Age Structure, and Partial Migration of Urban Merlins
Ian G. Warkentin, Paul C. James, and Lynn W. Oliphant
Notes and News
The Auk
Steroid Hormones in Relation to Territoriality, Breeding Density, and Parental Behavior in Male Yellow-headed Blackbirds
Les D. Beletsky, Gordon H. Orians, and John C. Wingfield
Univariate Metrics Are Not Adequate to Measure Avian Body Size
Scott Freeman and Wendy M. Jackson
Nutrient Reserve Dynamics of Breeding Canvasbacks
Jeb A. Barzen and Jerome R. Serie
Behavioral and Ecological Correlates of Territory Quality in the Eurasian Nuthatch (sitta Europaea)
Erik Matthysen
Migration Counts of Raptors at Hawk Mountain, Pennsylvania, as Indicators of Population Trends, 1934-1986
James C. Bednarz, Daniel Klem Jr., Laurie J. Goodrich, and Stanley E. Senner
Phylogenetic Patterns of Size and Shape of the Nasal Gland Depression in Phalacrocoracidae
Douglas Siegel-Causey
Effectiveness of Social Stimuli in Attracting Laysan Albatross to New Potential Nesting Sites
Richard H. Podolsky
100 Years Ago in the Auk
The Auk
Intersexual and Temporal Variation in Foraging Ecology of Prothonotary Warblers during the Breeding Season
Lisa J. Petit, Daniel R. Petit, Kenneth E. Petit, and W. James Fleming
Annual Variation in Foraging Ecology of Prothonotary Warblers during the Breeding Season
Lisa J. Petit, Daniel R. Petit, Kenneth E. Petit, and W. James Fleming
Comparative Breeding Biology of the Two Bill Morphs of the Black-bellied Seedcracker
Thomas Bates Smith
Plumage, Morphometric, and Song Variation in Mourning (oporornis Philadelphia) and Macgillivray's (o Tolmiei) Warblers
Jay Pitocchelli
Migration Routes of New World Sanderlings (calidris Alba)
J. P. Myers, M. Sallaberry A., E. Ortiz, G. Castro, L. M. Gordon, J. L. Maron, C. T. Schick, E. Tabilo, P. Antas, and T. Below
In Memoriam: William H Phelps Jr
François Vuilleumier
Elliott Coues Award, 1989
The Auk
Covers
Front Matter
The Auk
Back Matter
The Auk
Short Communications
Constancy of Margins of the Hybrid Zone in Titmice of the Parus Bicolor Complex in Coastal Texas
Keith L. Dixon
Multiple Functions of Courtship Displays in Dabbling Ducks (anatini)
Frank Mckinney, Lisa Guminski Sorenson, and Mark Hart
Taxonomic Status of the Coquette Hummingbird of Guerrero, Mexico
Richard C. Banks
Numbers of Sperm-storage Tubules in the Zebra Finch (poephila Guttata) and Bengalese Finch (lonchura Striata)
T. R. Birkhead and F. M. Hunter
Molecular Sexing of Geese Using a Cloned Z Chromosomal Sequence with Homology to the W Chromosome
Thomas W. Quinn, Fred Cooke, and Bradley N. White
Evidence for Vocal Learning by a Scrub Jay
Tom Webber and Rosemary A. Stefani
Commentaries
Male Parental Investment and Female Competence in Yellow-headed Blackbirds
Kevin J. Cash and L. Scott Johnson
Response to Cash and Johnson
David F. Gori
Response to Tome
Sarah Gaines