SHORT COMMUNICATIONS 
625 
K. J. Iknayan, M. C. Loven, T. L. McAllister, E. S. Michel. 
A. P. Monroe, S. M. Peterson, and J. M. Refsnidcr for 
assistance in field data collection, and J. P. Loegering anil 
two anonymous reviewers for constructive comments on 
the manuscript. 
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