0 Morisette, J.T. Richardson, A.D. Knapp, A.K. Fisher, J.I. Graham, E.A. Abatzoglou, J. Wilson, B.E. Breshears, D.D. Henebry, G.M. Hanes, J.M. 2008 Tracking the rhythm of the seasons in the face of global change: phenological research in the 21st century Frontiers in Ecology and the Environment 7 5 253-260