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Publikationstyp
Wissenschaftlicher Artikel
Erscheinungsjahr
2013
The rise of potentially toxin producing cyanobacteria in Lake Naivasha,
The rise of potentially toxin producing cyanobacteria in Lake Naivasha,
Autor:innen
Herausgeber
Quelle
Harmful algae
(2013), H. 27, Seite 42-51
(2013), H. 27, Seite 42-51
Schlagwörter
Blaualgen
Forschungskennzahl (FKZ)
Verbundene Publikation
Zitation
The rise of potentially toxin producing cyanobacteria in Lake Naivasha, 2013. Harmful algae [online]. Bd. (2013), H. 27, Seite 42-51. DOI 10.60810/openumwelt-1828. Verfügbar unter: https://openumwelt.de/handle/123456789/9159
Zusammenfassung englisch
Lake Naivasha, an important inland water ecosystem and a crucial freshwater resource in the Great African Rift Valley, has displayed clear signals of degradation inrecent decades. We studied the phytoplankton composition and biomass levels in the period 2001-2013 and noted a progressive increase in the occurrence of potentially toxic cyanobacteria. Analyses for the presence of cyanotoxins such as microcystins (MC), cylindrospermopsin (CYN) and anatoxin-a (ATX-a) were carried out on samples collected in 2008-2013. Among the cyanotoxins tested, low concentrations of MC were detected in the lake. This is the first record of the occurrence of MC in Lake Naivasha. For the first time, molecular phylogenetic investigations of field clones of cyanobacteria from Lake Naivasha were carried out to establish the taxa of the dominant species. Amplification of the aminotrasferase (AMT) domain responsible for cyanotoxin production confirmed the presence of the mcyE gene belonging to the microcystin synthesis gene cluster in field samples containing Microcystis and Planktothrix species. These findings suggest that toxin producing cyanobacteria could become a threat to users of this over- exploited tropical lake in the near future.Quelle: 2013 Elsevier B.V. All rights reserved.