1. Dept of Forest Resources; Univ. of Minnesota; St. Paul MN 55108 USA
2. German Centre for Integrative Biodiversity Research (iDiv); Deutscher Platz 5e Leipzig Germany
3. Michgan Tech. Univ.; Houghton MI 49931 USA
4. Hawksbury Inst. for the Environment, Univ. of Western Sydney; Penrith NSW 2753 Australia