Abstract
Most studies on effect of UV radiation (UV-R) are aut-ecological approaches, focusing on single organisms or single cellular targets. Few studies are synecological in the sense that they cover the integrated effect of UV-R on the ecosystem level. While there are some hypothetical and conceptual models on potential interactions between direct and indirect (ecosystem) effects (Fig. 9.1), there are few studies that really attempt to sort out the role of indirect food web effects. Assuming that productivity at all trophic levels will be hampered by UV-R, one could anticipate a cumulative and additive effect where the sum of direct and indirect effects is most pronounced at the top levels. This may not be so, however, since most food-webs are complex and intermixed and do not display a directed flow of energy from the bottom to the top. The outcome of UV-B in a food-web context may be rather complex and unexpected like those reported by Bothwell et al. (1994) where periphytic diatom communities gained increased biomass under UV exposure due to the high susceptibility of the grazers. One point of departure for such analysis are the concepts of “top-down” or “bottom-up” regulation. These simplified and complementary concepts may be fruitful for analysis of observed and potential effects of UV on food web interactions. While the complexity of the pelagic food web in temperate lakes may obscure the effects of UV radiation, the comparatively simple communities in Arctic localities may allow for a better resolution of environmental impacts.
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Hessen, D.O., Dahl-Hansen, G.A., Van Donk, E. (2002). UV Radiation and the Pelagic Food Web of Arctic Freshwaters. In: Hessen, D.O. (eds) UV Radiation and Arctic Ecosystems. Ecological Studies, vol 153. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-56075-0_9
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DOI: https://doi.org/10.1007/978-3-642-56075-0_9
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