Abstract
The occurrence of the calcite-loricated chlamydophycean alga Phacotus lenticularis was investigated in relation to the trophic state of inland waters. The Phytoflagellate was observed in deep, stratified dimictic lakes, in shallow polymictic lakes, oxbow-lakes and ponds. Habitats of Phacotus are rich in lime and vary from oligo- to hypertrophic. Mass developments with cell numbers of 500,000–5.5 x 106 individuals l-1 were found in lakes with properties in the ranges: TP 34–484 µg l-1, SRP 2–88 µg l-1, NO2-0–32 µg 1-1, NO3-0–820 µg l-1 and NH4 + 10–740 µg l-1. The most consistently co-incidental site factors were water temperature and pH values. High abundances were observed at temperatures between 15.8 and 24.7 °C and at pH values from 8.3 to 9.6. The results are discussed in the context of numerous records of Phacotus published in the literature. The morphometric and ecological data come mainly from the main investigated waters of the Baltic Lake District of northeastern Germany.
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Schlegel, I., Koschel, R. & Krienitz, L. On the occurrence of Phacotus lenticularis (Chlorophyta) in lakes of different trophic state. Hydrobiologia 369, 353–361 (1998). https://doi.org/10.1023/A:1017019925927
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DOI: https://doi.org/10.1023/A:1017019925927