Journal of Plankton Research, Vol 21, 1439-1453, Copyright © 1999 by Oxford University Press
O Hadas, R Pinkas, E Delphine, A Vardi, A Kaplan and A Sukenik
The first appearance of Aphanizomenon ovalisporum in
Lake Kinneret in August 1994 was apparently boosted by relatively high
concentrations of total dissolved phosphorus (12
ORIGINAL ARTICLES
Limnological and ecophysiological aspects of Aphanizomenon ovalisporum bloom in Lake Kinneret, Israel
Israel Oceanographic & Limnological Research, Yigal Allon Kinneret Limnological Laboratory, PO Box 345, Tiberias, 14102, Israel; National Institute of Oceanography, PO Box 8030 Haifa, 31080, Israel; Life Sciences, Hebrew University, Jerusalem, 91904, Israel
g P l-1 as compared to an
average of 8 
g P l-1). The increasing
Aphanizomenon biomass in a lake in which phytoplankton
are generally phosphate limited in summer and autumn was accompanied by
high enzymatic activity of alkaline phosphatase, reaching values of 2830
nmol MU l-1 h-1, suggesting a
great demand for phosphorus. In addition, the nitrogen requirement of the
developing population of Aphanizomenon was partly
provided by nitrogen fixation, as indicated by a high percentage of
heterocysts. Laboratory experiments demonstrated that filtrate from an old
Peridinium gatunense culture enhanced
Aphanizomenon growth. Thus, it is postulated that the
degradation of the massive Peridinium bloom in spring
and early summer supported the development of
A.ovalisporum. The high pH and alkalinity during the
bloom of Aphanizomenon indicate that
A.ovalisporum is probably a
HCO3- user. After 1994, akinetes of
A.ovalisporum were left in sediments and the water
column, and could be a source for the next year's bloom. This possibility
was demonstrated by inoculation of lake water and sediments into
nitrogen-depleted BG-11 medium, resulting in the dominance of
A.ovalisporum.
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