Kirchman et al. • MIGRATION STOPOVER IN AN INLAND PINE BARREN 
555 
that pass through the APBP adds taxonomic and 
geographic breadth to research on the timing of 
songbird migration and quadruples the number of 
species for which catchment areas have been 
estimated with this method. Wassenaar and 
Hobson (2001) found the catchment urea for 
Swanson's Thrushes (Cathams ustulatus) was 
much larger at Long Point, Ontario, than at Delta 
Marsh in Manitoba, suggesting that sites further 
along a migratory pathway will have larger 
catchment areas. The APBP may draw migrants 
from a larger area because it is southeast of those 
stopover sites. Comparisons among sites and 
among species may result in new insights 
regarding migratory pathways and the importance 
of specific stopover habitats as more hydrogen 
isotope data are published. 
ACKNOWLEDGMENTS 
We thank staff members of the Albany Pine Bush 
Preserve Commission (APBPC), the New York State 
Department of Environmental Conservation (NYSDF.C), 
and the New York State Office of Parks, Recreation and 
Historic Places (OPRHPj for assistance with field work, 
especially Tray Biasiolli and Laura Bried. We thank Brad 
Stratton for making the maps in Figures I and 4. Funding 
for isotope laboratory work was provided by NYSDEC and 
APBPC. Amruta Moghe assisted with processing of leather 
samples. Funding and logistical support for field work was 
provided by the New York State Museum, a division of the 
New York State Education Department, and by the New 
York State Bird Conservation Areas program administered 
by the OPRHP and the NYSDEC. We ilumk C E. Braun, 
Jason Bried, Kathy Schneider, and two anonymous 
reviewers for helpful comments on this paper. 
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