Abstract
Several ecological key factors were indicated in the Lake Kinneret ecosystem during 1969-2000: Elevation of the biomass of non-pyrrhophyte-phytoplankton, chlorophyta, cyanobacteria, and diatoms; decline of Peridinium maximal from 215 - 240 to 175 - 200 ranges (g/m2); decline of zooplankton (herbivore and predator) relative to phytoplankton biomass (g/m2); lower loads of Nitrogen and slightly also phosphorus in the river Jordan discharge; decline of precipitations and lake water level; significant decline of epilimnetic nitrogen and minor changes of phosphorus concentrations initiated decline of N/P mass ratio to the establishment of a significant change of the ecosystem to be modified from P to N limitation. What could be other than essential outcome of future prediction that results of 20 years (1969-2000) of routine and comprehensive monitor carried out in Lake Kinneret initiated? The Lake Kinneret ecosystem dynamics after 2000 justified retroactive post-factum earlier conclusion of appropriate predictability.
Highlights
During the last 80 years the Lake Kinneret and its drainage basin have undergone significant changes
Several ecological key factors were indicated in the Lake Kinneret ecosystem during 1969-2000: Elevation of the biomass of non-pyrrhophyte-phytoplankton, chlorophyta, cyanobacteria, and diatoms; decline of Peridinium maximal from 215 - 240 to 175 - 200 ranges (g/m2); decline of zooplankton relative to phytoplankton biomass (g/m2); lower loads of Nitrogen and slightly phosphorus in the river Jordan discharge; decline of precipitations and lake water level; significant decline of epilimnetic nitrogen and minor changes of phosphorus concentrations initiated decline of N/P mass ratio to the establishment of a significant change of the ecosystem to be modified from P to N limitation
What could be other than essential outcome of future prediction that results of 20 years (1969-2000) of routine and comprehensive monitor carried out in Lake Kinneret initiated? The Lake Kinneret ecosystem dynamics after 2000 justified retroactive post-factum earlier conclusion of appropriate predictability
Summary
During the last 80 years the Lake Kinneret and its drainage basin have undergone significant changes. Some of those changes are natural and others are anthropogenic. The present ecosystem structure is not similar to that one that was investigated and practically operated during 20 years earlier. Ecological modifications did not come abruptly but gradually instead. It is the natural characterization of ecological systems to be changed gradually and their recognition is not commonly strictly defined. The rational of this paper is making a renovated insight into an earlier (1969-2000) recognized trait of Lake Kin-
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