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Title (Primary) Environmental factors on Microcystin levels in waterbodies
Title (Secondary) Cyanotoxins - occurrence, causes, consequences
Author Lindenschmidt, K.E.; Chorus, I.; Niesel, V.; Fastner, J.; Wiedner, C.; Nixdorf, B.;
Publisher Chorus, I.;
Year 2001
Department ASAM; HYMOD; PB FuS;
Language englisch;
Keywords Total Phosphorus; Microcystis Aeruginosa; Envelope Function; Cyanobacterial Biomass; Euphotic Depth
Abstract As discussed in the introduction to Chapter 3, understanding how environmental factors influence cyanotoxin concentrations in waterbodies requires differentiation between two potential mechanisms: a direct impact on cellular toxin content, and/or an impact on competition between genotypes which would lead to dominance of strains or species with or without microcystin. The field results reported in Chapter 2 reinforce published observations that some taxa produce microcystins, others contain certain neurotoxins, and some may contain both or neither. However, further differentiation is possible: Chapter 4.1 shows that Microcystis spp., Planktothrix agardhii and Planktothrix rubescens each typically contain specific microcystin variants, though relative shares of variants as well as total microcystin content of the field populations may vary. Section 4.2 also addresses the level below that of species — i.e. the level of strains or genotypes — by investigating microcystin content in different strains of Microcystis aeruginosa isolated from two lakes. This results demonstrate a substantial variability of of microcystin content between different strains of M. aeruginosa. In conjunction with culture study results reoported in Chapter 3 (which showed little impact of environmental factors on cellular toxin content), this result suggests competition between strain of a species to be a decisive determinant of microcystin concentration in natural populations.
ID 6563
Persistent UFZ Identifier http://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=6563
Lindenschmidt, K.E., Chorus, I., Niesel, V., Fastner, J., Wiedner, C., Nixdorf, B. (2001):
Environmental factors on Microcystin levels in waterbodies
In: Chorus, I. (ed.)
Cyanotoxins - occurrence, causes, consequences
Springer, Berlin, Heidelberg, New York, p. 159 - 177