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River Epilithon — A Light and Organic Energy Transducer

  • Chapter
Perspectives in Running Water Ecology

Abstract

The energy pathways within running water systems have been the focus of many river ecologists since Noel Hynes’ paper on “Imported organic matter and secondary productivity in streams” (Hynes, 1963). This paper emphasized the role played by allochthonous organic energy sources to the overall energy economy of a river reach and spawned a massive research effort on this topic (see Anderson and Sedell, 1979; Cummins and Klug, 1979; Dance, Chapter 3; Bird and Kaushik, Chapter 2). However, lately a view of running waters has been put forward by Vannote and his colleagues (Vannote et al., 1980) where the relative importance of light energy over organic energy to rivers and streams is considered to be variable in time and space both within and between rivers. Such a perspective is an appropriate starting point for this chapter, since the epilithon, the heterogeneous slime community coating all submerged rock surfaces in rivers, has the capacity (in many instances) to process both light and organic energy simultaneously. It is important to remember from the outset that the epilithon is a mixed community of bacteria, fungi, algae, protozoa and micrometazoa, and although algae may at times apparently dominate the epilithon, at such times it will still contain a well developed heterotrophic community.

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  1. School of Animal Biology, University College of North Wales, Bangor, Gwynedd, UK

    M. A. Lock

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  1. University College of North Wales, Bangor, Gwynedd, UK

    Maurice A. Lock

  2. Scarborough College, University of Toronto, West Hill, Ontario, Canada

    D. Dudley Williams

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Lock, M.A. (1981). River Epilithon — A Light and Organic Energy Transducer. In: Lock, M.A., Williams, D.D. (eds) Perspectives in Running Water Ecology. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-1122-5_2

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