1. Department of Integrative Biology; University of California Berkeley; Berkeley; CA; 94720; USA
2. Department of Forest Engineering, Resources, and Management; Oregon State University; Corvallis; OR; 97331; USA
3. Centro de Ciencias de la Atmósfera; Universidad Nacional Autónoma de México; Ciudad de México; D.F.; México
4. Department of Natural Resources and the Environment; University of New Hampshire; Durham; NH; 03824; USA