Kagley et a!.. Residency, partial migration, and late egress of Oncorhynchus tshawytscha and O. kisutch 
553 
with Chinook salmon, the resident component of the 
population complex might enjoy higher overall fitness 
in some regimes and lower in others, effectively buffer¬ 
ing the complex as a whole. If so, variants in migrato¬ 
ry patterns may contribute to the capacity of Chinook 
salmon to persist during periods when environmental 
conditions in some marine habitats are less favorable. 
Acknowledgments 
We appreciate K. Dobszynski, J. Chamberlin, J. Hall, 
and T. Sandell, among many others for aid with field¬ 
work and F. Goetz, Washington Department of Fish 
and Wildlife, the U.S. Army Corps of Engineers, Se¬ 
attle Aquarium, Seattle City Light, the Nisqually and 
Squaxin Tribes, Beam Reach, and the Pacific Ocean 
Shelf Tracking Project. D. Spilsbury-Pucci, S. Moore 
and S. O’Neill gave invaluable input and interpreta¬ 
tion. Partial funding for this project was provided by 
the State of Washington’s Salmon Recovery Funding 
Board, National Marine Fisheries Service, and others. 
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