作者单位:Department of Renewable Resources, 442 ESB, University of Alberta, Edmonton, AB T6G 2E3, Canada[1]Department of Biological Sciences, California State Polytechnic University, Pomona, Pomona, California 91768 USA[2]Department of Biology, California State University, Bakersfield, 9001 Stockdale Hwy, Bakersfield, California 93311 USA[3]