Contents
Temporal and Spatial Patterns in Daily Mass Gain of Magnolia Warblers during Migratory Stopover
Erica H. Dunn
Molecular Phylogeny of Jacanas and Its Implications for Morphologic and Biogeographic Evolution
Linda A. Whittingham, Frederick H. Sheldon, and Stephen T. Emlen
Behavioral Responses to Decreasing Day Length in Wintering Sea Ducks
Geir H. Systad, Jan O. Bustnes, and Kjell E. Erikstad
Use and Selection of Sap Trees by Yellow-bellied Sapsuckers
Laurie S. Eberhardt
Song Types and Variation in Insular Populations of Lincoln's Sparrow (melospiza Lincolnii) and Comparisons with Other Melospiza
Carla Cicero and Z. Morgan Benowitz-Fredericks
Reproductive Consequences of Autumnal Singing in Black Redstarts (phoenicurus Ochruros)
Martin Weggler
Reproductive Anatomy and Indices of Quality in Male Tree Swallows: the Potential Reproductive Role of Floaters
Katharina Peer, Raleigh J. Robertson, and Bart Kempenaers
Adult Prey Choice Affects Chick Growth and Reproductive Success in Pigeon Guillemots
Gregory H. Golet, Katherine J. Kuletz, Daniel D. Roby, and David B. Irons
Correcting Nesting-success Estimates for Observer Effects: Maximum-likelihood Estimates of Daily Survival Rates with Reduced Bias
Jay J. Rotella and Mark L. Hansen
Seasonal, Age, and Sex-related Variation in Fatty-acid Composition of Depot Fat in Relation to Migration in Western Sandpipers
Oliver Egeler and Tony D. Williams
Blue-throated Hummingbird Song: a Pinnacle of Nonoscine Vocalizations
Millicent Sigler Ficken, Kathryn M. Rusch, Sandra J. Taylor, and Donald R. Powers
Low Frequency of Double Molt of Remiges in Ruddy Ducks Revealed by Stable Isotopes: Implications for Tracking Migratory Waterfowl
Keith A. Hobson, Robert B. Brua, William L. Hohman, and Len I. Wassenaar
Visual and Olfactory Attributes of Artificial Nests
Sheila A. Rangen, Robert G. Clark, and Keith A. Hobson
Predation Rates on Real and Artificial Nests
William B. Davison and Eric Bollinger
Phylogeny Biogeography, and Taxonomy of Australasian Teals
Martyn Kennedy and Hamish G. Spencer
Effect of Ephemeral Food Restriction on Growth of House Sparrows
Christopher A. Lepczyk and William H. Karasov
Influence of Niche Overlap and Territoriality on Hybridization Between Hermit Warblers and Townsend's Warblers
Scott F. Pearson and David A. Manuwal
Effects of Population Density on Survival in Merlins
David J. Lieske, Ian G. Warkentin, Paul C. James, Lynn W. Oliphant, and Richard H. Espie
Predicting Migratory Flight Altitudes by Physiological Migration Models
Felix Liechti, Marcel Klaassen, and Bruno Bruderer
Geographic and Ecological Variation in Clutch Size of Tree Swallows
Peter O. Dunn, Kevin J. Thusius, Kevin Kimber, and David W. Winkler
In Memoriam: John Thompson Emlen, Jr, 1908-1997
Wesley E. Lanyon, Stephen T. Emlen, and Gordon H. Orians
Covers
Front Matter
The Auk
Back Matter
The Auk
Short Communications
Song Type for Intrasexual Interaction in the Bush Warbler
Shi-Ryong Park and Daesik Park
Use of Blocked Design Increases Efficiency of Data Collection in Field Ornithology Study
Samuel B. Merrill, Gary Oehlert, and Francesca J. Cuthbert
A Preliminary Phylogenetic Hypothesis for the Cotingas (cotingidae) Based on Mitochondrial Dna
Richard O. Prum, Nathan H. Rice, Jason A. Mobley, and Walter W. Dimmick
Vagrants as the Expanding Fringe of a Growing Population
Richard R. Veit
Variation in the Number of Spermatozoa in Blue Tit and Great Tit Eggs
Jan T. Lifjeld, Christian K. Aas, Tim R. Birkhead, Fiona Fletcher, Christin Krokene, and Kari Rigstad
High Rates of Conspecific Brood Parasitism and Egg Rejection in Coots and Moorhens in Ephemeral Wetlands in Namibia
Ian G. Jamieson, Susan B. Mcrae, Robert E. Simmons, and Michael Trewby
Orientation Behavior of Garden Warblers (sylvia Borin) under Monochromatic Light of Various Wavelengths
Ralf Rappl, Roswitha Wiltschko, Peter Weindler, Peter Berthold, and Wolfgang Wiltschko
Facultative Nest Switching by Juvenile Ospreys
Lauren N. Gilson and John M. Marzluff
Awards
William Brewster Memorial Award, 1999
Walter D. Koenig
Elliott Coues Award, 1999
John R. Krebs Sir.
Reviews
The Handicap Principle: a Missing Piece of Darwin's Puzzle
Richard Buchholz
New World Blackbirds: the Icterids
Michael S. Webster
Helpers at Birds' Nests: a Worldwide Survey of Cooperative Breeding and Related Behavior
Jerram L. Brown
The American Robin
Rex Sallabanks
A Guide to the Birds and Mammals of Coastal Patagonia
Fabian M. Jaksic
Reviews
The Handicap Principle: a Missing Piece of Darwin's Puzzle
Richard Buchholz
New World Blackbirds: the Icterids
Michael S. Webster
Helpers at Birds' Nests: a Worldwide Survey of Cooperative Breeding and Related Behavior
Jerram L. Brown
The American Robin
Rex Sallabanks
A Guide to the Birds and Mammals of Coastal Patagonia
Fabian M. Jaksic