Journal
AQUATIC ECOSYSTEM HEALTH & MANAGEMENT
Volume 13, Issue 2, Pages 154-163Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/14634981003788953
Keywords
light limitation; nutrient limitation; diatoms; cyanobacteria
Funding
- Estonian Ministry of Education and Research [SF 0170011508]
- Estonian Science Foundation [7600]
- EC
- Estonian Ministry of Environment
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Water level changes (7-year moving averages) in Lake Vortsjarv (Estonia) during 1885-2000 were correlated with winter patterns in the North Atlantic Oscillation (NAO) index. In this shallow lake (270 km(2), mean depth 2.8 m), where the annual water level amplitude is 1.4 m and the absolute range is 3.2 m, hydrology is the main driving force for the ecosystem. Control of phytoplankton growth was mediated by ice conditions in spring, and by water level in summer and autumn. Winter air temperature similarly influenced the biomass of cyanobacteria and diatoms in spring; while the effect of the ice-cover duration was more pronounced on cyanobacteria. Mean depth of the lake did not affect the phytoplankton biomass in spring, but clearly controlled it in summer and autumn. The direct impact of winter conditions on biological processes was restricted to a short post-winter period, but extended indirectly as the water level for the entire growing season depended strongly on the height of the spring flood peak.
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