New data on microbial communities and related sponge fauna from the Alkaline Satonda Crater Lake (Sumbawa, Indonesia)
Citable Link (URL):http://resolver.sub.uni-goettingen.de/purl?gs-1/5070
First published (peer reviewed)In: Reitner, Joachim (Eds.) Globale und regionale Steuerungsfaktoren biogener Sedimentation
Göttinger arbeiten zur Geologie und Paläontologie : Sonderband ; 2
The small erater lake of the Island Satonda is characterized by highly alkaline conditions as a whole probably due to an intense sulfate reduction in the deep anoxic water body. Some portions of the highly alkali ne water is penetrating through the uppermost pycnocline and increases the alkalinity in the upper oxic water body (alkalinity pump). The upper water body is beside its slightly increased alkalinity (4-5 meq/I) eharacterized by a decreased salinity (32 %0). This special hydroehemical situation let to a very speeific and endemie development of the biota. Cyanobacteria and heterotrophie microbes exhibit large diversities in contrast to just one sponge taxon (Suberites/Polmastia n. sp.). Common are cyanobacteria of the taxa Pleurocapsa, Phormidium, Calothrix, Spirulina, Microcoleus and Microcystaeea.