|
|
vol. 7, nr. 2 (2006)
|
Diel changes in the plankton communities of the ecotone zone of a peat mat of the dystrophic lake „Głodne Jeziorko” (Drawieński National Park)
|
|
|
Natalia Kuczyńska-Kippen, Piotr Klimaszyk, Elżbieta Szeląg-Wasielewska
|
|
| (get PDF )
|
|
|
Department of Water Protection, Adam Mickiewicz University, ul. Drzymały 24, 60-613 Poznań, Poland |
|
|
vol. 7 (2006), nr. 2,
pp. 423-431
|
|
|
abstract:
Analysis of net phytoplankton revealed that the taxonomically richest were Chrysophyceae with dominating genus Dinobryon, mainly Dinobryon pediforme, and Zygnematophyceae, mainly genera Closterium, Micrasterias and Staurastrum. Less often appeared Dinophyceae, Raphidophyceae and Bacillariophyceae. In the open water zone the colonies of Dinobryon and one-cell desmides prevailed, while within the peat mat the participation of filamentous green algae increased. As a result of zooplankton examination, the presence of 47 species (33 Rotifera, 10 Cladocera, 4 Copepoda) was recorded. In most cases the quantity dominance of rotifers over crustaceans, irrespective of the station (A and B) or time of day (day or night), was noticed. The zooplankton densities were much higher within the peat mat stations compared to the open water zone during the daylight hours at both stations. However, the analysis of zooplankton distribution during the night hours revealed a shift of the total densities in the direction of the open water. Such a pattern of the diurnal dynamics of zooplankton communities suggests the use of the peat mat as a day-time refuge for zooplankton against the vertebrate predators.
|
|
keywords:
peat mat, zooplankton, phytoplankton, dystrophic lake
|
|
original in:
Polish
|
|
|
|
|
|
