Czech Phycology 3: 169-176, 2003
Phytoplankton communities in the drinking water reservoir of Znojmo
Společenstva fytoplanktonu ve vodárenské nádrži Znojmo
The reservoir was built in 1966 for drinking water supply, power generation, and irrigation. It is characterized by a very short retention time, narrow river-like shape, low average and maximum depths and high total phosphorus loading. Its catchment is large and strongly influenced by human activities. The composition of phytoplankton, zooplankton, chlorofyl-a concentration and chemical variables were analyzed monthly in the main vegetation seasons 1999-2002. The composition of phytoplankton assemblages is influenced both by high trophic status and extreme technical parameters of the reservoir. Diatoms prevailin spring, green algae and diatom Fragilaria crotonensis in summer. Blue-green algae occur mainly in late summer, but they have not recently constituted massive water blooms. Short retention time, intensive input of relatively cold water of the Dyje, River and consequently lower stability of the water column in summer are considered the main reasons for such a situation.
Published: March 1, 2003 Show citation
