NDLI: Primary Production of Phytoplankton in a Strongly Stratified Temperate Lake

Content Provider	Springer Nature Link
Author	Nõges, Tiina Kangro, Kersti
Copyright Year	2005
Abstract	Lake Verevi (12.6 ha, maximum depth 11.0 m, mean depth 3.6 m) is a strongly eutrophic and stratified lake. Planktothrix agardhii is the most characteristic phytoplankton species in summer and autumn, while photosynthesizing sulphur bacteria can occur massively in the metalimnion. Primary production (PP) and chlorophyll a concentration (Chl a) were seasonally studied in 1991, 1993, 2000, and 2001. Vertical distribution of PP was rather complex, having usually two peaks, one at or near the surface (0–1 m), and another deeper (at 3–7 m) in the metalimnion. The values of dark fixation of CO2 in the metalimnion were in most cases higher than those in the upper water layer. Considering the average daily PP 896 mg C m−2 and yearly PP 162 mg C m−2, Secchi depth 2.34 m, and epilimnetic concentrations of chlorophyll a (19.6 mg m−3), total nitrogen and total phosphorus (TP, 52 mg m−3) in 2000, L. Verevi is a eutrophic lake of a ‘good’ status. Considering the total amounts of nutrients stored in the hypolimnion, the average potential concentrations in the whole water column could achieve 1885 mg m−3 of TN and 170 mg m−3 of TP reflecting hypertrophic conditions and a ‚bad’ status. Improvement of the epilimnetic water quality from the 1990s to the 2000s may have resulted from incomplete spring mixing and might not reflect the real improvement. A decreased nutrient concentration in the epilimnion has supported the establishment of a ‘clear epilimnion state’ allowing light to penetrate into the nutrient-rich metalimnion and sustaining a high production of cyanobacteria and phototrophic sulphur bacteria.
Starting Page	105
Ending Page	122
Page Count	18
File Format	PDF
ISSN	00188158
Journal	Hydrobiologia
Volume Number	547
Issue Number	1
e-ISSN	15735117
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	production sharply stratified lake interannual, seasonal, and diurnal dynamics metalimnetic chlorophyll maximum ecological status Ecology Hydrobiology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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