Aaron Kaplan1, Gad Weiss1, Assaf Sukenik2. 1. Department of Plant and Environmental Sciences, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram, Jerusalem, 9190401, Israel. 2. The Yigal Allon Kinneret Limnological Laboratory, Israel Oceanographic and Limnological Research, P.O.B. 447, Migdal, 14950, Israel.