Filamentous algae in fish ponds of the Třeboň Biosphere Reserve-ecophysiological study
✍ Scribed by Martina Eiseltová; Jan Pokorný
- Publisher
- Springer Netherlands
- Year
- 1994
- Tongue
- English
- Weight
- 901 KB
- Volume
- 113
- Category
- Article
- ISSN
- 1385-0237
No coin nor oath required. For personal study only.
✦ Synopsis
Filamentous algae in eutrophic carp ponds in South Bohemia (Central Europe) were studied from 1988 to 1990. High biomass (490 g DW m -2) was attained by Cladophorafracta (O. E MUll. ex Vahl) Ktitz. after two months of growth. This marked growth depleted inorganic carbon in the water, but did not decrease the concentration of tissue nutrients. Laboratory measurements of final pH indicate that all the filamentous algae studied, except for Tribonema, are very efficient HCO~-users. An extremely high pH of 11.6 and oxygen concentration of 32 mg 1-1 were measured in the algal mats. High pH resulted in CaCO3 precipitation, visible as white incrustations on algal filaments. The amount of precipitated CaCO3 reached 134 kg ha -1 . After reaching peak biomass, 90% of the Cladophora decomposed over the next 95 days.
The highest net photosynthetic rate in C. fracta was measured between pH range 8.5-10.0 and oxygen concentrations of 7-12 mg 1 -j . Optimum temperature for photosynthesis was between 17-22 °C.