Person: Fastner, Jutta
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Veröffentlichung Occurrence, Distribution and Toxins of Benthic Cyanobacteria in German Lakes(2023) Bauer, Franziska; Wolfschläger, Immanuel; Fastner, Jutta; Geist, JürgenCyanobacteria are favored by climate change and global warming; however, to date, mostresearch and monitoring programs have focused on planktic cyanobacteria. Benthic cyanobacte-ria blooms also increase and pose a risk to animal and human health; however, there is limitedknowledge of their occurrence, distribution and the toxins involved, especially in relation to theirplanktic conspeciï Ącs. Therefore, we analyzed the benthic and planktic life forms of cyanobacterialcommunities in 34 lakes in Germany, including a monitoring of cyanotoxins. Community analyseswere based on microscopic examination and Illumina sequencing of the 16S rRNA gene. The analysesof cyanotoxins were carried out using LC-MS/MS and ELISA. Observed benthic mats containingcyanobacteria consisted mainly of Nostocales and Oscillatoriales, being present in 35% of the lakes. Ana-toxin was the most abundant cyanotoxin in the benthic samples, reaching maximum concentrationsof 45,000Ìg/L, whereas microcystin was the predominate cyanotoxin in the open-water samples,reaching concentrations of up to 18,000Ìg/L. Based on the results, speciï Ąc lakes at risk of toxiccyanobacteria could be identiï Ąed. Our ï Ąndings suggest that monitoring of benthic cyanobacteria andtheir toxins should receive greater attention, ideally complementing existing open-water samplingprograms with little additional effort. © 2023 by the authors.Veröffentlichung Mass occurrence of anatoxin-a- and dihydroanatoxin-a-producing tychonema sp. in mesotrophic reservoir mandichosee (River Lech, Germany) as a cause of neurotoxicosis in dogs(2020) Bauer, Franziska; Bartha-Dima, Bernadett; Fastner, JuttaIn August 2019, three dogs died after bathing in or drinking from Mandichosee, a mesotrophic reservoir of the River Lech (Germany). The dogs showed symptoms of neurotoxic poisoning and intoxication with cyanotoxins was considered. Surface blooms were not visible at the time of the incidents. Benthic Tychonema sp., a potential anatoxin-a (ATX)-producing cyanobacterium, was detected in mats growing on the banks, as biofilm on macrophytes and later as aggregations floating on the lake surface. The dogsâ€Ì pathological examinations showed lung and liver lesions. ATX and dihydroanatoxin-a (dhATX) were detected by LC-MS/MS in the stomachs of two dogs and reached concentrations of 563 and 1207 Ìg/L, respectively. Anatoxins (sum of ATX and dhATX, ATXs) concentrations in field samples from Mandichosee ranged from 0.1 Ìg/L in the open water to 68,000 Ìg/L in samples containing a large amount of mat material. Other (neuro)toxic substances were not found. A molecular approach was used to detect toxin genes by PCR and to reveal the cyanobacterial community composition by sequencing. Upstream of Mandichosee, random samples were taken from other Lech reservoirs, uncovering Tychonema and ATXs at several sampling sites. Similar recent findings emphasize the importance of focusing on the investigation of benthic toxic cyanobacteria and applying appropriate monitoring strategies in the future. © 2020 by the authors