The Wilson Journal of Ornithology 
(formerly The Wilson Bulletin) 
Volume 123, Number 1 CONTENTS March 2011 
Major Articles 
1 Species limits in an thirds (Thamnophilidae): the Scale-backed Antbird ( Willisornis poecilinotus) 
complex 
Morton L. Isler and Bret M. Whitney 
15 High apparent annual survival and stable territory dynamics of Chestnut-backed Antbird ( Myrmeciza 
exsut) in a large Costa Rican rain forest preserve 
Stefan Woltmann and Thomas W. Sherry 
24 Ornithological records from a campina/campinarana enclave on the upper Jurua River, Acre, Brazil 
Edson Guilherme and Sergio H. Borges 
33 Stable nitrogen and carbon isotopes may not be good indicators of altitudinal distributions of montane 
passerines 
Yuan-Mou Chang, Kent A. Hatch, Hsin-Lin Wei, Hsiao-Wei Yuan, Cheng-Feng 
You, Dennis Eggett, Yi-Hsuan Tu, Ya-Ling Lin, and Hau-Jie Shiu 
48 Seasonal fecundity and source-sink status of shrub-nesting birds in a southwestern riparian corridor 
L. Arriana Brand and Barry R. Noon 
59 Wintering bird response to fall mowing of herbaceous buffers 
Peter J. Blank, Jared R. Parks, and Galen P. Dively 
65 Interspecific variation in habitat preferences of grassland birds wintering in southern pine savannas 
Matthew E. Brooks and Philip C Stoujfer 
76 Geographic song variation in the non-oscine Cuban Tody ( Todus multicolor) 
Eneider E. Perez Mena and Emanuel C. Mora 
85 Observations on the natural history of the Royal Sunangel ( Heliangelus regalis ) in the Nangaritza Valley, 
Ecuador 
Juan E Freile, Paolo Piedrahita, Galo Buitron-Jurado, Carlos A. Rodriguez, 
Oswaldo Jaddn, and Elisa Bonaccorso 
93 Nesting behavior of Szechenyi s Monal-Partridge in treeline habitats, Pamuling Mountains, China 
Kai Zhang, Nan Yang, Yu Xu, Jianghong Ran, Huw Lloyd, and Bisong Yue 
97 Reproductive status of Swallow-tailed Kites in east-central Arkansas 
Scott J. Chiavacci, Troy J. Bader, Amy M. St. Pierre, James C. Bednarz, and 
Karen L. Rowe 
102 Nestling behavior and parental care of the Common Potoo (Nyctibius griseus) in southeastern Brazil 
Cesar Cestari, Andre C. Guaraldo, and Carlos O. A. Gussoni 
107 Botfly parasitism effects on nestling growth and mortality of Red-crested Cardinals 
Luciano N. Segura and Juan C. Reboreda 
116 Muscle membrane phospholipid class composition in White-throated Sparrows in relation to migratio 
Jeremy Springer, Edwin R. Price, Raymond Thomas, and Christopher G. Guglielmo 
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Continued on inside back cover 
