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Toxins 2014, 6(10), 2912-2931; doi:10.3390/toxins6102912

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

1
Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Alte Fischerhütte 2, Stechlin D-16775, Germany
2
Department of Microbiology, Central University of Rajasthan, Bandarsindri-305801 (Ajmer), India
3
Department of Limnology, University of Pannonia, Egyetem utca 10, Veszprém H-8200, Hungary
4
Department of Botany, University of Debrecen, Egyetem tér 1, Debrecen H-4032, Hungary
5
MTA-PE Limnoecology Research Group, Egyetem utca 10, Veszprém H-8200, Hungary
6
LimPlan, Gewässer- und Landschaftsökologie, Otawistr. 19, Berlin D-13351, Germany
7
INRA, UMR CARRTEL, 75 avenue de Corzent, BP 511, Thonon-les-Bains Cedex F-74203, France
*
Author to whom correspondence should be addressed.
Received: 21 July 2014 / Revised: 17 September 2014 / Accepted: 17 September 2014 / Published: 29 September 2014
(This article belongs to the Section Marine and Freshwater Toxins)
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Abstract

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. View Full-Text
Keywords: cyanotoxins; microcystin; Lake Stechlin; Aphanizomenon; Dolichospermum; Microcystis; Planktothrix cyanotoxins; microcystin; Lake Stechlin; Aphanizomenon; Dolichospermum; Microcystis; Planktothrix
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Dadheech, P.K.; Selmeczy, G.B.; Vasas, G.; Padisák, J.; Arp, W.; Tapolczai, K.; Casper, P.; Krienitz, L. Presence of Potential Toxin-Producing Cyanobacteria in an Oligo-Mesotrophic Lake in Baltic Lake District, Germany: An Ecological, Genetic and Toxicological Survey. Toxins 2014, 6, 2912-2931.

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