Contents
New Species and New Species Limits in Birds
A. Townsend Peterson
A New Herpsilochmus Antwren (aves: Thamnophilidae) from Northern Amazonian Peru and Adjacent Ecuador: the Role of Edaphic Heterogeneity of Terra Firme Forest
Bret M. Whitney and Jose Alvarez Alonso
Use of Vocalizations to Establish Species Limits in Antbirds (passeriformes: Thamnophilidae)
Morton L. Isler, Phyllis R. Isler, and Bret M. Whitney
Wingbeat Frequency of Two Catharus Thrushes during Nocturnal Migration
Robert H. Diehl and Ronald P. Larkin
High Paternity without Paternity-assurance Behavior in the Purple Sandpiper, a Species with High Paternal Investment
Elin P. Pierce and Jan T. Lifjeld
Density-dependent Effects on Growth, Body Size, and Clutch Size in Black Brant
James S. Sedinger, Mark. S. Lindberg, Brian T. Person, Michael W. Eichholz, Mark P. Herzog, and Paul L. Flint
Molecular Phylogenetics of the Genus Piranga: Implications for Biogeography and the Evolution of Morphology and Behavior
Kevin J. Burns
Daily Energy Expenditure of Male and Female Marsh Harrier Nestlings
Bernd Riedstra, Cor Dijkstra, and Serge Daan
Colonial Nesters in a Deteriorating Habitat: Site Fidelity and Colony Dynamics of Lesser Snow Geese
Barbara Ganter and Fred Cooke
An Unusual Sequence of Flight-feather Molt in Common Murres and Its Evolutionary Implications
Christopher W. Thompson, Monique L. Wilson, Edward F. Melvin, and D. John Pierce
Foraging-niche Dynamics of Gadwalls and American Coots in Winter
S. Keith Mcknight and Gary R. Hepp
Variation in Ejaculate Quality in Dark-eyed Juncos According to Season, Stage of Reproduction, and Testosterone Treatment
Tracey L. Kast, Ellen D. Ketterson, and Val Nolan Jr.
Response of Great Horned Owls to Experimental Hot Spots" of Snowshoe Hare Density"
Christoph Rohner and Charles J. Krebs
Morphological Adaptation with No Mitochondrial Dna Differentiation in the Coastal Plain Swamp Sparrow
Russell Greenberg, Pedro J. Cordero, Sam Droege, and Robert C. Fleischer
Philippine Birds of Prey: Interrelations among Habitat, Morphology, and Behavior
Anita Gamauf, Monika Preleuthner, and Hans Winkler
Interactions among Environmental Stress, Body Condition, Nutritional Status, and Dominance in Great Tits
Luis M. Carrascal, Juan Carlos Senar, Ingrid Mozetich, Fransec Uribe, and Jordi Domenech
Influence of Breeding Phenology and Clutch Size on Hybridization Between Hermit and Townsend's Warblers
Scott F. Pearson and Sievert Rohwer
Barred Owl Home Range and Habitat Selection in the Boreal Forest of Central Saskatchewan
Kurt M. Mazur, Shanna D. Frith, and Paul C. James
In Memoriam: Martin Humphrey Moynihan, 1928-1996
Neal Griffith Smith
100 Years Ago in the Auk
The Auk
Covers
Front Matter
The Auk
Back Matter
The Auk
Short Communications
Fat Storage in Male Willow Warblers in Spring: Do Residents Arrive Lean or Fat?
Thord Fransson and Sven Jakobsson
Are Rooster Crows Honest Signals of Fighting Ability?
Bryant Furlow, Rebecca T. Kimball, and Michael C. Marshall
Modeling the Breeding Cycle of Long-lived Birds: Why Do King Penguins Try to Breed Late?
Anders Brodin, Olof Olsson, and Colin W. Clark
Flight without Horizon References in European Starlings
Robert G. Moyle and Frank H. Heppner
Metabolic Rate, Temperature Regulation, and the Energetic Implications of Roost Nests in the Bananaquit (coereba Flaveola)
Michele Merola-Zwartjes
Assortative Mating and Sexual Size Dimorphism in Western and Semipalmated Sandpipers
Brett K. Sandercock
Subadult Movement Patterns of the Endangered Hawaiian Stilt (himantopus Mexicanus Knudseni)
J. Michael Reed, Michael D. Silbernagle, Karen Evansew Engilis, and Lewis W. Oring
Commentaries
Modeling Departure Strategies in Auks
Anthony J. Gaston
Evaluating Models of Departure Strategies in Alcids
R. C. Ydenberg