Microbiology and chemistry of acid lakes in Florida: II. Seasonal relationships |
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Authors: | R Thomas James |
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Institution: | (1) Department of Genetics and Microbiology, Autonomous University of Barcelona, Bellaterra, 08193 Barcelona, Spain;(2) Department of Microbiology, University of Barcelona, Av.. Diagonal 645, 08028 Barcelona, Spain;(3) Marine Sciences Institute, CSIC, Passeig Nacional s/n, 08003 Barcelona, Spain |
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Abstract: | The microstratification of the metalimnetic community in Lake Cisó was followed through the diel cycle by means of a fine sampler with syringes spaced at 3 cm intervals. Populations were sharply stratified. The uppermost part of the metalimnion was occupied by the rotifer Anuraeopsis fissa. Next, layers of the ciliate Coleps hirtus and the flagellate Cryptomonas phaseolus were found. Finally, purple sulfur bacteria appeared at the bottom part of the metalimnion. Although in lower abundances, characteristic populations of ciliates were found at each depth: Strombidium inhabited zones with oxygen, while Plagiopyla and Metopus lived at depths with sulfide. Several members of the community moved vertically about 20 cm during the diel cycle. Cryptomonas performed larger vertical migrations of 40 cm. This organism concentrated at the upper metalimnion during the day, and dispersed through the lower metalimnion during the night. At night, Cryptomonas lived in an environment without oxygen and with sulfide concentrations up to 0.6 mM. |
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Keywords: | Diel cycle vertical migration Cryptomonas phaseolus anaerobic ciliates fine sampling stratification |
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