Affiliation: | (1) Department of Mathematics, Purdue University, West Lafayette, IN 47907, USA;(2) Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907, USA;(3) Institute of Aretic Biology, University of Alaska, Fairbanks, AK 99775, USA;(4) Department of Biological Sciences, Idaho State University, Pocatello, ID 83209, USA |