Revista de Biología Tropical ISSN Impreso: 0034-7744 ISSN electrónico: 2215-2075

OAI: https://revistas.ucr.ac.cr/index.php/rbt/oai
Microbiological observations in the anoxic basin Golfo Dulce, Costa Rica
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Keywords

Microbial diversity
16S rRNA probes
Thiovulum
Thiospira
Beggiatoa
sulfate reduction
sulfide oxidation

How to Cite

Kuever, J., Wawer, C., & Lillebaek, R. (1996). Microbiological observations in the anoxic basin Golfo Dulce, Costa Rica. Revista De Biología Tropical, 44(S3), 49–57. Retrieved from https://revistas.ucr.ac.cr/index.php/rbt/article/view/29405

Abstract

Our basic microbiological studies of the water column and the sediment of Golfo Dulce, Costa Rica, were focused on aerobic and denitrifying sulfur-oxidizing bacteria and anaerobic sulfate-reducing bacteria. We observed no increasing numbers of total bacterial counts within the water column. Although no oxygen was present hydrogen sulfide was only detectable close to the sediment. The highest numbers of solfate-reducing bacteria measured by Most-Probable-Number counts were found in or close to the sediment. In the anoxic bottom water sulfide-oxidizing bacteria typically containing large sulfur globules were observed microscopically. They were identified as free-swimming Thiovulum and Thiospira species. At one station large vacuolated forms of the filamentous colourless sulfur bacterium Beggiatoa were noted. Together with these sulfur containing bacteria there were long free swimming rods showing no sulfur inclusions of unknown character. The microscopic observations showed good correlation with Most-Probable-Number-counts and molecular biological techniques for sulfate-reducing bacteria.
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Copyright (c) 1996 Revista de Biología Tropical

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