Presence of Potential Toxin-Producing Cyanobacteria in an Oligo-Mesotrophic Lake in Baltic Lake District, Germany:An Ecological, Genetic and Toxicological Survey

Toxins

Gábor Vasas¹  Judit Padisák²  Kálmán Tapolczai²  Géza B. Selmeczy³  Pawan K. Dadheech³  Lothar Krienitz³  Peter Casper³  Wolfgang Arp⁴ 

[1] Department of Botany, University of Debrecen, Egyetem tér 1, Debrecen H-4032, Hungary;Department of Limnology, University of Pannonia, Egyetem utca 10, Veszprém H-8200, Hungary;Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Alte Fischerhütte 2, Stechlin D-16775, Germany;LimPlan, Gewässer- und Landschaftsökologie, Otawistr. 19, Berlin D-13351, Germany;

关键词: cyanotoxins;    microcystin;    Lake Stechlin;    Aphanizomenon;    Dolichospermum;    Microcystis;    Planktothrix;   

DOI  :  10.3390/toxins6102912

来源: DOAJ

【 摘 要 】

Massive developments of potentially toxic cyanobacteria in Lake Stechlin,an oligo-mesotrophic lake in the Baltic Lake District of Germany raised concerns about toxic contamination of these important ecosystems. Field samples in the phase of mass developments of cyanobacteria were used for genetic and toxicological analyses. Microcystins and microcystin genes were detected in field samples of the lake for the first time. However, the toxins were not produced by the dominant taxa (Dolichospermum circinale and Aphanizomenon flos-aquae) but by taxa, which were present only in low biomass in the samples (Microcystis cf. aeruginosa and Planktothrix rubescens). The phytoplankton successions during the study period revealed an increase of cyanobacterial populations. The findings contribute to the changes that have been investigated in Lake Stechlin since the mid-1990s. The possible reasons behind these developments may be climate change, special weather conditions and an increased nutrient pool.

【 授权许可】

Unknown