1 Gene E. Likens is a distinguished research professor in the Department of Ecology and Evolutionary Biology at the University of Connecticut, Storrs, CT, USA, and founding director and president emeritus at the Cary Institute of Ecosystem Studies, Millbrook, NY, USA. likensg@caryinstitute.org.
2 David L. Wagner is a professor in the Department of Ecology and Evolutionary Biology at the University of Connecticut, Storrs, CT, USA. david.wagner@uconn.edu.