Contents
Genetic Variation in Sympatric Willow Flycatchers (empidonax Traillii) and Alder Flycatchers (e Alnorum)
Gilles Seutin and Jean-Pierre Simon
Temporal Variation in Prey Preference Patterns of Adult Ospreys
Thomas C. Edwards Jr.
Effects of Spacing and Synchrony on Breeding Success in the Great Frigatebird (fregata Minor)
Barry J. Reville
Genetic Differentiation of Piping Plovers across North America
Susan M. Haig and Lewis W. Oring
Notes and News
The Auk
Mate, Site, and Territory Fidelity in Piping Plovers
Susan M. Haig and Lewis W. Oring
100 Years Ago in the Auk
The Auk
Age Correlations Within Pairs of Breeding Birds
Walter V. Reid
The Advantages Of, and Constraints Forcing, Mate Fidelity in Pinyon Jays
John M. Marzluff and Russell P. Balda
Tropical Forest Bird Counts and the Effect of Sound Attenuation
Robert B. Waide and Peter M. Narins
Honest Advertising, Sexual Selection, Courtship Displays, and Body Condition of Polygynous Male Harriers
Robert Simmons
Initial Size Hierarchy in Broods of the Shag: Relative Significance of Egg Size and Hatching Asynchrony
Jogeir N. Stokland and Trond Amundsen
Nesting Success is Higher for Polygynously Mated Females Than for Monogamously Mated Females in the Eastern Meadowlark
Richard W. Knapton
Timing of Reproduction in Two Populations of Willow Ptarmigan in Northern Canada
Susan J. Hannon, Kathy Martin, and Jim O. Schieck
Reproductive Success and Colony-site Tenacity in Caspian Terns
Francesca J. Cuthbert
Observations of a Mixed-species Flock of Birds Foraging on Euphausiids near St Matthew Island, Bering Sea
George L. Hunt Jr., Nancy M. Harrison, and William M. Hamner
Habitat Selection by Breeding American Redstarts in Response to a Dominant Competitor, the Least Flycatcher
Thomas W. Sherry and Richard T. Holmes
In Memoriam: Herbert Friedmann
Stephen I. Rothstein, Ralph W. Schreiber, and Thomas R. Howell
In Memoriam: Fran
G. F. Mees
In Memoriam: Robert S Arbib Jr, 1915-1987
C. Stuart Houston
William Brewster Memorial Award, 1987
Jerram L. Brown
Elliott Coues Award, 1987
John C. Wingfield
Covers
Front Matter
The Auk
Back Matter
The Auk
Short Communications
Why White-winged Crossbills Do Not Defend Feeding Territories
Craig W. Benkman
The Relationships among Polygyny, Male Parental Care, and Female Breeding Success in the Indigo Bunting
David F. Westneat
Seasonal Changes in Food Preferences of American Robins in Captivity
Nathaniel T. Wheelwright
On the Danger of Using Dummy Nests to Study Predation
Tomas Willebrand and Vidar Marcstr
Uterovaginal Sperm-storage Glands in Sixteen Species with Comments on Morphological Differences
Gary W. Shugart
Genetic Differentiation Between North American Kinglets and Comparisons with Three Allied Passerines
James L. Ingold, Lee A. Weigt, and Sheldon I. Guttman
Rediscovery of the Sooty Rail (porzana Tabuensis) in American Samoa
John Engbringew and Andrew Engilis Jr.
The Relationship Between Hylocichla and Catharus (turdinae)
Kevin Winker and John H. Rappole
Commentaries
Ornithology in Central and South America: Cause for Optimism?
David Cameron Duffy
Learning to Live with Nature: a Commendable Philosophy with Practical Limitations
H. Blokpoel and G. D. Tessier
Response to H Blokpoel and G D Tessier
William E. Southern