1. US Geological Survey, Western Ecological Research Center, 800 Business Park Drive, Suite D, Dixon, CA 95620 USA and University of California, Davis, Department of Animal Science, and Graduate Group in Ecology, Davis, CA 95616 USA
2. US Geological Survey, Western Ecological Research Center, 800 Business Park Drive, Suite D, Dixon, CA 95620 USA
3. University of California, Davis, Department of Animal Science, and Graduate Group in Ecology, Davis, CA 95616 USA