 |
Water Science & Technology Vol 42 No 1-2 pp 49–54 © IWA Publishing 2000
The community structure of Lake Kinneret (Israel) microorganism populations:
size distribution and succession
T Bergstein Ben-Dan*, D Wynne**, B Shteinman***, Z Hu**** and Y Kamenir*****
*
Israel Oceanographic and Limnological Research Co., The Yigal Allon
Kinneret Limnological Laboratory, POB345, Tiberias 14102, Israel
**
Israel Oceanographic and Limnological Research Co., The Yigal Allon
Kinneret Limnological Laboratory, POB345, Tiberias 14102, Israel
***
Israel Oceanographic and Limnological Research Co., The Yigal Allon
Kinneret Limnological Laboratory, POB345, Tiberias 14102, Israel
****
Chinese Academy of Sciences, Wuhan, Peoples Republic of China
*****
Dept. of Biological Sciences, Bar Ilan University, Ramat Gan, 52900, Israel
ABSTRACT
The abundance and succession of bacterial populations, and their biovolume
has been studied in the deepest station of Lake Kinneret, Israel during
spring–summer. These parameters were then related to the chemical,
biological and physical/hydromechanical conditions in the lake. Medium
sized cells (2–3  m) dominated the bacterial population in the
spring, then in mid-summer the smaller cell fraction (1 m) took over.
Relatively low numbers of large cells (10 m) were counted, but the
biovolume of this fraction was significant, especially in mid-summer. Both the abundance and biovolume of medium sized cells were positively
correlated with NH4+ and O2 concentrations,
but not with NO3–, inorganic orthophosphate
(Pi) and Total-P. At water temperatures above 28°C, the biovolume of
medium sized cells decreased, probably due to faster grazing of zooplankton.
When water circulation in the vertical plane was dominant, large cells
disappeared from the water column, due to sinking to the bottom. We
conclude that chemical parameters, such as NH4+ and
O2 concentrations, had a long-term effect on bacterial succession
and size distribution, whereas hydromechanical mechanisms, such as
turbulent mixing in the horizontal or vertical planes, had a short-term
effect.
Full article (PDF Format)
PAY-PER-VIEW: Buy this article for £20.00 (IWA MEMBER PRICE: £15.00)
|
|
|
