Characteristics of lotic algal communities in hill headwaters

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The effects of light conditions, substrate and water pH on algal communities were surveyed in hill headwaters. There was a positive relationship between relative light intensityand cell abundance. When a comparison was made of cell abundance on gravel with that on sand, mud and leaves, the former tended to be high and the latter low. Comparison of the effect of light conditions and substrate on cell abundance revealed that the effect of light conditions was great. The number of species was high when relative light intensity was high, whereas there was no clear relationship between differences in substrate and the number of species. Batrachospermum moniliforme, Oscillatoria spp. and some Bacillariophyceae were distributed only in areas of high relative light intensity.Eunotia spp. tended to be distributed in areas of low relative light intensity.B. moniliformewas collected on only gravel, whereas other species were found on various substrates. The water pH ranged from 6.2 to 7.8. When the pH was low, the proportion of Eunotia spp. among total diatoms became high, but when the pH was high, the proportion tended to be low. In the algal communities in whichEunotiaspp. grew, the number of species tended to decrease as the pH became lower.
日本水処理生物学会の論文