Journal
ANNALES DE LIMNOLOGIE-INTERNATIONAL JOURNAL OF LIMNOLOGY
Volume 48, Issue 2, Pages 177-185Publisher
EDP SCIENCES S A
DOI: 10.1051/limn/2012010
Keywords
Akinete; germination; N-2-fixing cyanobacteria; Cylindrospermopsis raciborskii; Aphanizomenon sp.; light; phosphorous; sediment
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Funding
- Balaton Project of the Office of the Prime Minister of Hungary (MEH)
- Bolyai Research Fund
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Cyanobacteria are a worldwide group of photosynthetic prokaryotes that can cause nuisance blooms in eutrophic waters. It is generally accepted that their resting cells, akinetes, play an important role in the dispersal, recruitment, initiation of blooms and survival under unfavourable conditions, therefore information on the germination, distribution and abundance of akinetes in natural sediments is essential for understanding the ecology and bloom dynamics of N-2-fixing cyanobacteria. The present study describes the effect of irradiance on the germination and subsequent growth of N-2-fixing filamentous cyanobacteria developed from natural akinete stock in sediment of Lake Balaton (Hungary) with varying phosphorous supply. The research focuses on the invasive Cylindrospermopsis raciborskii and Aphanizomenon flos-aquae the most abundant species of this lake. In the experiments, the germination of ten filamentous N-2-fixing cyanobacteria species was observed. The species assemblages of the germinated cyanobacteria populations showed strong light and phosphorus dependence. Anabaena and Anabaenopsis species became dominant in phosphorous-rich conditions, while in phosphorus-deficient environments Aphanizomenon species and C. raciborskii dominated. Among the germinated filaments we have detected Anabaenopsis cunningtonii and Anabaena compact a, which have not been observed in Lake Balaton previously. Our results suggest that among the filamentous hetero-cytic cyanobacteria of this shallow lake the invasive C. raciborskii was the best competitor when phosphorus supply and irradiance were low.
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