作者单位:
Natural Resources Canada, Canadian Forest Service, Atlantic Forestry Centre, PO Box 4000, Fredericton, New Brunswick, E3B 5P7, Canada
[1]
Department of Biology, University of Maryland, College Park, MD 20742, USA
[2]
Conservation Ecology Center, Smithsonian Conservation Biology Institute, National Zoological Park, 1500 Remount Rd., Front Royal, VA 22630, USA
[3]
发布时间
2013-11-20