Contents
The White-crowned Sparrow: Stability, Recruitment, and Population Structure in the Nuttall Subspecies (1975-1980)
Lewis Petrinovich and Thomas L. Patterson
Foraging-flock Recruitment at a Black-billed Gull Colony: Implications for the Information Center Hypothesis
Roger M. Evans
Notes and News
The Auk
How Important Are Bird Colonies as Information Centers?
Range D. Bayer
The Hindlimb Musculature of the Mousebirds (coliiformes)
Susan L. Berman and Robert J. Raikow
Territoriality and Behavioral Correlates of Reproductive Success of Great Black-backed Gulls
Ronald G. Butler and Saskia Janes-Butler
Feeding Ecology of Nonbreeding Populations of Larids Off Deer Island, New Brunswick
B. M. Braune and D. E. Gaskin
Variability in Nest Survival Rates and Implications to Nesting Studies
A. T. Klett and Douglas H. Johnson
Social Organization in a Nesting Population of Eastern Willets (catoptrophorus Semipalmatus)
Marshall A. Howe
Comparative Genetics of Three Trumpeter Swan Populations
Victoria A. Barrett and E. R. Vyse
Notice to Authors
The Auk
The Role of Reproductive Success in Colony-site Selection and Abandonment in Black Skimmers (rynchops Niger)
Joanna Burger
Wood Duck Displays and Pairing Chronology
Judith Scherpelz Armbruster
Summer Rainfall and Winter Sparrow Densities: a Test of the Food Limitation Hypothesis
John B. Dunning Jr. and James H. Brown
The Relationships of the Hawaiian Honeycreepers (drepaninini) as Indicated by Dna-dna Hybridization
Charles G. Sibley and Jon E. Ahlquist
Some Considerations on Sibling Competition and Avian Growth Rates
Robert E. Ricklefs
Factors Affecting Feeding and Brooding of Gray Catbird Nestlings
Ellen J. Johnson and Louis B. Best
Reproductive Success of Grassland Sparrows on a Reclaimed Surface Mine in West Virginia
Thomas Wray, Kenneth A. Strait, and Robert C. Whitmore
Covers
Front Matter
The Auk
Back Matter
The Auk
Short Communications
Semi-synthetic Diets as a Tool for Nutritional Ecology
Mary E. Murphy and James R. King
First Record of the Great Auk (pinguinus Impennis) from Labrador
Richard H. Jordan and Storrs L. Olson
A Hybrid Between the Hooded and Silver Grebes (podiceps Gallardoi and P Occipitalis)
Robert W. Storer
Reciprocal Allopreening in the Brown-headed Nuthatch
D. Bruce Barbour and Anthony R. Degange
A Nest of Eutoxeres Aquila Heterura in Western Ecuador
Gregory O. Vigle