Seasonal patterns of microcystin-producing and non-producing Planktothrix rubescens genotypes in a deep pre-alpine lake
نویسندگان
چکیده
منابع مشابه
Diversity of microcystin genotypes among populations of the filamentous cyanobacteria Planktothrix rubescens and Planktothrix agardhii.
Microcystins (MCs) are toxic heptapeptides that are produced by filamentous cyanobacteria Planktothrix rubescens and Planktothrix agardhii via nonribosomal peptide synthesis. MCs share a common structure cyclo (-D-Alanine(1)-L-X(2)- D-erythro-beta-iso-aspartic acid(3)-L-Z(4)-Adda(5)-D-Glutamate(6)- N-methyl-dehydroalanine(7)) where X(2) and Z(2) are variable L-amino acids in positions 2, 4 of t...
متن کاملThe toxicity and enzyme activity of a chlorine and sulfate containing aeruginosin isolated from a non-microcystin-producing Planktothrix strain.
The toxicity of six different Planktothrix strains was examined in acute toxicity assays with the crustacean Thamnocephalus platyurus. The presence of toxicity in two strains could be explained by the occurrence of microcystins. The other four Planktothrix strains were not able to produce microcystins due to different mutations in the microcystin synthetase (mcy) gene cluster. In these strains,...
متن کاملAbundance and toxicity of Planl<tothrix rubescens in the pre-alpine Lake Ammersee, Germany
Regular occurrences of the cyanobacterium Plankcotlllix rubescens have been observed in several lakes that have undergone recent re-oligotrophication, e.g. Lake Ammersee. Planktothn",~ species are known to produce microcystins, potent pllOsphatase inhibitors that have been associated with morbidities and mortalities in hUinans and animals. The aim of this study was to characterise the temporal ...
متن کاملExperimental models of microcystin accumulation in Daphnia magna grazing on Planktothrix rubescens: implications for water management.
In this study, we investigated the kinetic aspects of the microcystin (MC) transfer from Planktothrix rubescens to Daphnia magna by carrying out exposure experiments in small simple mesocosms. We hypothesized that higher fractions of toxic cyanobacteria in the diet of grazers would shift the balance towards a greater than linear, i.e. non-linear accumulation of MC in D. magna. This hypothesis w...
متن کاملOral toxicity of the microcystin-containing cyanobacterium Planktothrix rubescens in European whitefish (Coregonus lavaretus).
The microcystin-producing cyanobacterium Planktothrix is one of the most widespread genera amongst toxin producing cyanobacteria in European lakes. In particular, the metalimnic blooms of Planktothrix rubescens have been associated with growing problems in the professional freshwater fishery as a decrease in yearly yields in the important coregonids fishery often coincides with the appearance o...
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ژورنال
عنوان ژورنال: Harmful Algae
سال: 2015
ISSN: 1568-9883
DOI: 10.1016/j.hal.2015.10.001