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Titolo:
DO ACID-TOLERANT CYANOBACTERIA EXIST
Autore:
STEINBERG CEW; SCHAFER H; BEISKER W;
Indirizzi:
INST FRESHWATER ECOL & INLAND FISHERIES,MUGGELSEEDAMM 310 D-12587 BERLIN GERMANY
Titolo Testata:
Acta hydrochimica et hydrobiologica
fascicolo: 1, volume: 26, anno: 1998,
pagine: 13 - 19
SICI:
0323-4320(1998)26:1<13:DACE>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
LAKES;
Keywords:
ACID-TOLERANT CYANOBACTERIA; PICOPLANKTIC CYANOBACTERIA; ACID GRADIENT; GEOGENIC ACIDIFICATION; PH VALUE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
19
Recensione:
Indirizzi per estratti:
Citazione:
C.E.W. Steinberg et al., "DO ACID-TOLERANT CYANOBACTERIA EXIST", Acta hydrochimica et hydrobiologica, 26(1), 1998, pp. 13-19

Abstract

Acidification of freshwater ecosystems changes phytoplankton biomass and reduces species composition. However, there are contradictory statements with respect to the occurrence of cyanobacteria below pH4.5. Textbooks have not reported cyanobacteria in acid and very acid environments, whereas only a few papers on acidification of lakes through acidprecipitation noted the occurrence of cyanobacteria in those environments. In a phytoplankton survey of 10 lakes in the Bavarian Forest as well as the lignite mining districts of Bavaria (Upper Palatine) and Lusatia, covering a pH gradient from 8.0 to 2.8, we demonstrate that acid-tolerant cyanobacteria do exist. Most strikingly, one of the most acid lakes (pH 2.9), Lichtenauer See (Lusatia), was inhabited by two populations of filamentous cyanobacteria, resembling Oscillatoria/Limnothrix and Spirulina spp. Eukaryotic phytoplankton was almost absent in this lake at the time. In contrast to filamentous cyanobacteria, picoplanktic ones were totally lacking where pH < 4.5. This indicates that members of coccal picoplanktic cyanobacteria and filamentous cyanobacteria have different acid tolerances. At present, it is not known how the acid-tolerant cyanobacteria described here maintain a strong transmembrane pH gradient.

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Documento generato il 05/12/20 alle ore 13:53:12