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JPR Advance Access published online on April 12, 2006
Journal of Plankton Research, doi:10.1093/plankt/fbl004
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received November 4, 2005
Accepted April 7, 2006

Article

Temporal and vertical variation of chlorophyll a concentration, phytoplankton photosynthetic activity and light attenuation in Lake Kinneret: possibilities and limitations for simulation by remote-sensing

Yosef Z. Yacobi 1 *

1 Israel Oceanographic and Limnological Research, Yigal Allon Kinneret Limnological Laboratory, P.O. Box 4475, Migdal, Israel 14950

* To whom correspondence should be addressed.
Yosef Z. Yacobi, E-mail: yzy{at}ocean.org.il


  Abstract

The relationship between chlorophyll a (Chl) and primary productivity in the uppermost water layer and the water column-based (0-15 m) integral values of those variables were examined using measurements taken in Lake Kinneret, Israel from 1990 to 2003. In 81% of all chlorophyll a profiles examined the distribution was fairly uniform within the entire 0-15 m water column, and in 12.3% of instances showed a prominent subsurface maximum, when the lake phytoplankton was dominated by the dinoflagellate Peridinium gatunense. Chl can be reliably estimated by remote sensing techniques in the productive and turbid water of Lake Kinneret, since Chl concentration at surface layers can be extrapolated to the entire water column. Light vertical attenuation coefficient average for wavelengths from 400 to 700 nm, Kd, ranged from 0.203 to 1.954 m-1, and showed high degree of temporal variation. The maximal rate of photosynthetic efficiency, PBopt , average was 3.16 (±1.50), ranged from 0.25 to 8.85 mg C m-3 h-1 mg Chl-1. Using measured data of Chl, PBopt, and light as an input, a simple depth-integrated primary productivity model allowed plausible simulation of primary productivity. However, a lack of correlation between photosynthetic activity and temperature (or other variable with remotely sensed potential) renders the use of models which require input of photosynthetic efficiency to calculate integrated primary productivity of little value in the case of the productive and turbid Lake Kinneret.

Communicating Editor: KJ Flynn


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