Four-Year Study on Phytoplankton Biodiversity in a Small Hypertrophic Lake Affected by Water Blooms of Toxigenic Cyanobacteria
Magdalena Toporowska, Barbara Pawlik-Skowrońska
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Department of Hydrobiology, University of Life Sciences in Lublin,
Dobrzańskiego 37, 20-262 Lublin, Poland
Pol. J. Environ. Stud. 2014;23(2):491-499
In a shallow hypertrophic lake, species richness of phytoplankton was very high (174-223 taxa, yearly) but values of Shannon-Weaver index were very low (0.04-1.38). Perennial blooms (2.1×107-11.6×107 ind.·L-1) of microcystin-producing (up to 123.6 μg intracellular MCs·L-1 in 2006, and 43.8-57.3 μg·L-1 in 2008-09) cyanobacterium Planktothrix agardhii and the time of their appearance affected phytoplankton species richness (34-66% loss) and diversity (4-9 fold decrease in the values of Shannon-Weaver index). Short-term mass development of anatoxin-a-producing cyanobacteria (Dolichospermum spp. and/or Cuspidothrix issatschenkoi) did not influence algal biodiversity.
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