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The formation and dynamics of deep bacteriochlorophyll maximum in the temperate and partly meromictic Lake Verevi

  • Tiina Nõges
  • Irena Solovjova
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Part of the Developments in Hydrobiology book series (DIHY, volume 182)

Abstract

Vertical distribution of phytoplankton and the formation of deep chlorophyll maximum (DCM) in the metalimnion of a small stratified and partly meromictic temperate lake was studied in 1999 and 2000. During summer DCM usually occurred on the borderline of H2S and oxygen-containing waters. At the depths where the bacteriochlorophyll (Bchl) maxima were observed, the sulphide concentration was usually relatively low compared to the bottom layers, where its concentration reached as high as possible saturation level. In April 2000, DCM was formed at the depth of 3.5 m, and lowered thereafter slowly to 6.5 m by October. The concentration of Bchl d reached the highest values (over 1000 µg l−1) just before the water column was mixed up in autumn. In December and April Bchl d was detectable only near the bottom of the lake. The concentration of chlorophyll a yielded by the spectrophotometric phaeopigment corrected method and by HPLC (high pressure liquid chromatography), fit rather well in the upper layers. In deeper water layers chlorophyll a concentration (Chl a) measured by spectrophotometry was overestimated about 47 times if compared to HPLC values because of the high Bchl d in that layer. In most cases vertical profiles of primary production (PP) did not coincide with the vertical distribution of the pigment content; the maximum values of PP were found in the epilimnion. In some cases PP had notably high values also at the depth of DCM. In the upper layers Chl a usually did not exceeded 20 µg l1 in spring and 10 µg l1 in summer. The moderately high Chl a in the epilimnion in spring was significantly reduced after the formation of thermocline most probably because of the establishment of the nutrient limitation in epilimnion. Decreasing Chl a concentration in the epilimnion led to increased water transparency and better light conditions for photosynthetic bacteria in metalimnion.

Key words

stratified lake deep chlorophyll maximum bacteriochlorophyll photosynthetic bacteria 

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Copyright information

© Springer 2005

Authors and Affiliations

  • Tiina Nõges
    • 1
  • Irena Solovjova
    • 2
  1. 1.Institute of Agriculture and Environmental Sciences, Limnological CentreEstonian Agricultural UniversityRannu, Tartu CountyEstonia
  2. 2.Institute of Zoology and HydrobiologyUniversity of TartuTartuEstonia

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