Production of the cyanotoxin nodularin—A multifactorial approach

摘要: Abstract Summer blooms in the Baltic Sea are dominated by diazotrophic cyanobacteria Nodularia spumigena and Aphanizomenon sp. During blooms, N. is concentrated to water surface exposed high irradiances of both photosynthetic active radiation (PAR, 400–700 nm) ultraviolet (UVR, 280–400 nm), addition, this organism seasonal changes nutrient conditions. produces nodularin, a hepatotoxin lethal wild domestic animals. It has been suggested that accumulation nodularin within cell release from affected different environmental factors. One laboratory experiment two outdoor experiments were performed investigate interaction treatments, PAR PAR + UV-A + UV-B (PAB); three replete (NP), nitrogen limited (–N), phosphorus (–P) presence absence on intracellular as well extracellular concentration spumigena. In study, we hypothesised ambient radiation, limitation, or would affect nodularin. We further increase production have negative effect specific growth rate co-existing species. Significant effects found between factors investigated. all experiments, lowest concentrations under limitation. The highest intra- observed limitation when shielded UVR. our opinion, removal e.g. sewage treatment, should consider possible increased toxicity blooms. had no significant treatments. Thus, conclude although dependent conditions, it did not species