Impact of storm-flow on electron transport system activity in river biofilms

Autor: S.A. Blenkinsopp, Maurice A. Lock
Rok vydání: 1992
Předmět:
Zdroj: Freshwater Biology. 27:397-404
ISSN: 1365-2427
0046-5070
DOI: 10.1111/j.1365-2427.1992.tb00549.x
Popis: SUMMARY 1. The effect of storm-flow on light- and dark-grown biofilms from a North Wales river was monitored using electron transport system (ETS) activity and epifluorescence cell counts. 2. Artificial substrata were colonized in the river, exposed to ambient-flow (60 cms−1) or storm-flow (235 cms−1 with suspended sediment addition) for 12h in a laboratory flow tank, and returned to the river to monitor the recovery period. 3. Total cell densities decreased in both the light- and dark-grown biofilms as a result of storm-flow. In addition, storm-flow ETS activity per cell increased significantly in the light-grown samples (2.7 times) but did not increase significantly in the dark-grown samples (1.6 times). 5. Within 48 h, storm-flow total cell densities and ETS activity levels had returned to ambient-flow levels in both light- and dark-grown biofilms. 6. Within each light regime, despite their different histories, both ambient and storm-flow samples responded the same to daily changes in the river environment, including a second disruption by natural causes, for the remainder of the 24-day experiment.
Databáze: OpenAIRE
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