Effects of Ambient and Enhanced UV-B Radiation on Periphyton in a Mountain Stream
Open Access
- 1 December 1997
- journal article
- research article
- Published by Taylor & Francis in Journal of Freshwater Ecology
- Vol. 12 (4), 615-628
- https://doi.org/10.1080/02705060.1997.9663576
Abstract
We examined the influence of UVR on an open and a shaded section of a mountain stream (2,850 m a.s.l.) by comparing periphyton and grazers on clay substrates under four light regimes (UVR blocked and UV-B enhanced treatments and two controls). Neither ambient levels of UVR nor enhanced UV-B appeared to have an adverse impact on periphyton in the shaded section. However, enhanced UV-B in the open section appeared to cause a decline in periphyton biomass and diversity. Diatoms seemed particularly susceptible as twenty-eight species were absent from the UV-B enhanced treatment but were present 2 m downstream in the control. Tube-dwelling diatoms were only present at UV-B enhanced treatments (shade and open). Hydrurus foetidus (cells embedded in mucopolysaccharide) was relatively rare at all sites except the UV-B enhanced treatment in the open where it was the dominant alga. Periphyton may use mucopolysaccharide to diminish harmful UV-B effects. Grazer densities in the UV-B enhanced sites were similar to controls and treatments blocking UVR. Our results suggest that potential UV-B increases due to thinning of the ozone layer could have direct adverse effects on the periphyton assemblage in open sections of high elevation streams.Keywords
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