1. Centro de Estudos Florestais, Instituto Superior de Agronomia; University of Lisbon; 1349-017 Lisbon Portugal
2. Department of Biological Sciences; Dartmouth College; 125 Life Science Center, Hanover NH 03755 U.S.A.
3. Southern Research Station, USDA Forest Service; 2500 Shreveport Hwy, Pineville LA 71360 U.S.A.