Migratory birds have the potential for population limitation on
areas other than the breeding grounds. We review the state of current
knowledge on the potential for limitation on wintering grounds and postbreeding
habitats, with emphasis on Midwestern species and ecosystems.
Although little studied, post-breeding habitat selection within the breeding
grounds may be important to offspring survival, as many migrants fledge in
June but do not migrate until September. We provide data on movements
of wood thrush as an example of problems faced at this time. We also
examine the winter ecology of Midwest migrants, including habitats used,
adaptations for existence, and problems faced. In all cases, we discuss
both the opportunities and constraints faced by Midwest managers concerned
with migratory birds.