This is contribution 317 from PISCO, the Partnership for Interdisciplinary Studies of Coastal Oceans funded primarily by the Gordon and Betty Moore Foundation and David and Lucile Packard Foundation. We thank J. Lubchenco and B. Menge for establishing and maintaining the PISCO observational program at OSU as well as Captain P. York, C. Holmes, and S. Holmes for their data collection efforts. Additional support for JAB was provided by National Science Foundation Grant OCE-9907854.
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