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JPR Advance Access published online on March 11, 2008
Journal of Plankton Research, doi:10.1093/plankt/fbn037
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© The Author 2008. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Light availability for Chlorobium phaeobacteroides development in Lake Kinneret

Alon Rimmer*, Ilia Ostrovsky and Yosef Z. Yacobi

Israel Oceanographic & Limnological Research Ltd. Yigal Allon Kinneret Limnological Laboratory P.O. Box 447 Migdal 14950 Israel

* Corresponding author: Phone: +972 4 6721444 ext. 212, Fax: +972 4 6724627. E-mail: alon{at}ocean.org.il

Received on December 25, 2007; revised on March 2, 2008; accepted on March 4, 2008


  Abstract

The green sulfur bacterium Chlorobium phaeobacteroides (Chl. phaeobacteroides) forms a dense population in the oxygen devoid layers of Lake Kinneret, Israel, from July throughout November. The typical vertical distribution of the species is characterized by a prominent peak at the center of the metalimnion, but, the light available at that depth in Lake Kinneret is far below the values that enable maximal photosynthetic activity of Chl. phaeobacteroides. In this paper we report on our findings regarding the characteristics of Chl. phaeobacteroides development in Lake Kinneret, both in space and time. We farther quantified the available light in the metalinmion, and suggest a model for the development of Chl. phaeobacteroides in the lake. Spatial analysis of Chl. phaeobacteroides suggest that a combination of diurnal north-west wind, diurnal oscillations of the metalimnion, and the hours of sunlight, result in a situation in which the metalimnion in some parts of the lake is exposed to slightly higher light intensities than the other parts of the lake, and therefore allows higher concentrations of Chl. phaeobacteroides to develop. The analysis of Chl. phaeobacteroides with time suggests that it can be described fairly well by the logistic growth model.

Communicating Editor: Dr Roger Harris


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