Journal
KNOWLEDGE AND MANAGEMENT OF AQUATIC ECOSYSTEMS
Volume -, Issue 408, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/kmae/2013042
Keywords
ecophases; eulittoral; European Water Framework Directive; littoral macrophytes; water level fluctuation
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Funding
- Academy of Sciences of the Czech Republic [AV0Z60170517]
- Ministry of Education of the Czech Republic [MSM6007665801, 7E11059]
- Grant Agency of the Czech Republic [206/09/1764]
- EU FP7 project [244121]
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Lakes and reservoirs that are used for water supply and/or flow regulations have usually poorly developed littoral macrophyte communities, which impairs ecological potential in terms of the EU Water Framework Directive. The aim of our study was to reveal controlling factors for the growth of littoral macrophytes in a storage reservoir with fluctuating water level (Lipno Reservoir, Czech Republic). Macrophytes occurred in this reservoir only in the eulittoral zone i.e., the shoreline region between the highest and the lowest seasonal water levels. Three eulittoral sub-zones could be distinguished: the upper eulittoral with a stable community of perennial species with high cover, the middle eulittoral with relatively high richness of emergent and amphibious species present at low cover values, and the lower eulittoral devoid of permanent vegetation. Cover and species composition in particular sub-zones were primarily influenced by the duration and timing of flooding, followed by nutrient limitation and strongly reducing conditions in the flooded organic sediment. Our results stress the ecological importance of eulittoral zone in reservoirs with fluctuating water levels where macrophyte growth can be supported by targeted management of water level, thus helping reservoir managers in improving the ecological potential of this type of water bodies.
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