Diversity and distribution of cyanobacterial toxins in the Italian subalpine lacustrine district

Nine lakes (Garda, Maggiore, Como, Iseo, Lugano, Idro, Pusiano, Ledro, and Levico) located in the Italian subalpine lacustrine district were chosen for a comparative study of the diversity and distribution of cyanobacterial toxins. All nine lakes are known to host different toxic cyanobacteria, main...

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Bibliographic Details
Published in:Oceanological and hydrobiological studies 2012-09, Vol.41 (3), p.54-63
Main Authors: Cerasino, Leonardo, Salmaso, Nico
Format: Article
Language:English
Subjects:
anatoxin-a
Comparative analysis
Comparative studies
Correlation analysis
Cyanobacteria
Cyanobacterial toxins
Distribution
Earth and Environmental Science
Earth Sciences
Eutrophication
Freshwater
Lakes
LC-MS
Marine
Marine & Freshwater Sciences
Microcystins
Nodularins
Oceanography
Original Research Paper
Planktothrix rubescens
Sampling
Statistical analysis
Statistical methods
subalpine lakes
Surveying
Toxicity
Toxins
Water temperature
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Summary:Nine lakes (Garda, Maggiore, Como, Iseo, Lugano, Idro, Pusiano, Ledro, and Levico) located in the Italian subalpine lacustrine district were chosen for a comparative study of the diversity and distribution of cyanobacterial toxins. All nine lakes are known to host different toxic cyanobacteria, mainly Planktothrix rubescens . An analytical protocol has been used, based on LC-MS technique, for determining 20 different toxins (14 microcystins, 2 nodularins, anatoxin-a and 3 cylindrospermopsins). In the investigation, microcystins were found in all lakes on all sampling dates. Anatoxin-a could be detected in 6 lakes, but it was only present in 4 lakes on all sampling dates (lakes Garda, Iseo, Como, and Maggiore). Nodularins and cylindrospermopsins were not detected at all. The number of microcystins detected in the survey was 9, but 4 were the most abundant (dmRR, YR, dmLR, and LR); they were differently distributed among the lakes, thus providing each lake a unique toxic potential. Statistical analysis showed positive correlations between total microcystin concentrations and eutrophication indicators and also between anatoxin-a concentrations and water temperature, suggesting that anthropic and climate-related stressors can have different impacts on the presence of different cyanotoxins.
ISSN:1730-413X
1897-3191
1897-3191
DOI:10.2478/s13545-012-0028-9