Evaluation of Microphytobenthos Productivity in Lake Pleshcheevo Based on Plant Pigment Stock |
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| Authors: | L E Sigareva N A Timofeeva A A Zubishina O V Babanazarova |
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| Institution: | (1) Institute of Inland Water Biology, Russian Academy of Sciences, pos. Borok, Nekouzskii Raion, Yaroslavl oblast, 152742, Russia;(2) Yaroslavl State University, ul. Sovetskaya 14, Yaroslavl, 150000, Russia |
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| Abstract: | Results of spectrophotometric determination of plant pigments (chlorophylls, phaeo-pigments, and carotenoids) in the upper 3-cm layer of the littoral and sublittoral lake bottom sediments are presented for the depths corresponding to water transparency of 0.2, 0.5; 1, 2, and 3. Pigment characteristics are analyzed for the conditions, theoretically ensuring the possibility of photosynthesis and development of microphytobenthos. The presence of live algae in the bottom sediments is confirmed by directly counting the cells capable of positive photokinesis. The specific character of pigments' horizontal distribution is determined by a circum-bathymetric structure of the lake sediment complex and by illumination conditions. Potentially active, “pure” chlorophyll prevails in the euphotic area in the zone of light saturation, whereas phaeo-pigments prevail in the area of limited illumination. Regression equations describing relations between pigments concentration and depth have been obtained. The ratio between chlorophyll concentration in microphytobenthos and that of phytoplankton in the lake is estimated. |
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