1. Department of Biological Sciences, University of Southern California, Allan Hancock Foundation Building, Los Angeles, CA 90089, USA
2. Department of Earth Sciences, University of Southern California, Zumberge Hall of Science, Los Angeles, CA 90089, USA
3. Environmental Studies Program, University of Southern California, College Academic Services Building, Los Angeles, CA 90089, USA
4. Department of Geosciences, Pennsylvania State University, 503 Deike Building University Park, PA 16802, USA