Abstract
Microbial succession and changes in photosynthetic rate attendant on the film development of periphyton were investigated using artificial substrata in a shallow eutrophic region of the midstream of the Tamagawa River. Bacteria played the role of pioneer colonizer in the periphyton development. Algae joined the community after formation of bacterial colonies on substrata and dominated in the mature stage. Algae accounted for about 80 percent of the periphyton community in maximum and 50-70 percent in carbon weight under ordinary conditions in spring. Total numbers of aerobic heterotrophic bacteria were 107-109 cells/cm2 and 1010-1012 cells/gC in the mature stage. A number of sulfate-reducing bacteria were also found in that stage. Photosynthetic rates of sessile algae varied widely with film development of periphyton. They showed 3-20mg·O2/mg·chl.-a·hr in the early stage and 1-3mg·O2/mg·chl.-a·hr in the mature stage. An extremely low photosynthetic rate was found just before the exfoliation of periphyton occurred.
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Schedule a callMore From: Japanese Journal of Limnology (Rikusuigaku Zasshi)
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