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| Titel |
Local nutrient regimes determine site-specific environmental triggers of cyanobacterial and microcystin variability in urban lakes |
| VerfasserIn |
S. C. Sinang, E. S. Reichwaldt, A. Ghadouani |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 19, no. 5 ; Nr. 19, no. 5 (2015-05-07), S.2179-2195 |
| Datensatznummer |
250120705
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| Publikation (Nr.) |
 copernicus.org/hess-19-2179-2015.pdf |
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| Zusammenfassung |
| Toxic cyanobacterial blooms in urban lakes present serious health hazards to
humans and animals and require effective management strategies. Managing
such blooms requires a sufficient understanding of the controlling
environmental factors. A range of them has been proposed in the literature
as potential triggers for cyanobacterial biomass development and cyanotoxin
(e.g. microcystin) production in freshwater systems. However, the
environmental triggers of cyanobacteria and microcystin variability remain a
subject of debate due to contrasting findings. This issue has raised the
question of whether the relevance of environmental triggers may depend on
site-specific combinations of environmental factors. In this study, we
investigated the site-specificity of environmental triggers for
cyanobacterial bloom and microcystin dynamics in three urban lakes in
Western Australia. Our study suggests that cyanobacterial biomass,
cyanobacterial dominance and cyanobacterial microcystin content variability
were significantly correlated to phosphorus and iron concentrations.
However, the correlations were different between lakes, thus suggesting a
site-specific effect of these environmental factors. The discrepancies in
the correlations could be explained by differences in local nutrient
concentration. For instance, we found no correlation between cyanobacterial
fraction and total phosphorous (TP) in the lake with the highest TP
concentration, while correlations were significant and negative in the other
two lakes. In addition, our study indicates that the difference of the
correlation between total iron (TFe) and the cyanobacterial fraction between
lakes might have been a consequence of differences in the cyanobacterial
community structure, specifically the presence or absence of nitrogen-fixing
species. In conclusion, our study suggests that identification of
significant environmental factors under site-specific conditions is an
important strategy to enhance successful outcomes in cyanobacterial bloom
control measures. |
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