Abstract
Ingold (1942, 1975) and other early students of aquatic hyphomycetes (e.g. Petersen 1962, 1963a,b, Nilsson 1964) quickly established that these fungi are most common and most diverse in clean, well-oxygenated streams running through forests. Human activities will modify these conditions. Some of the changes may be beneficial to the fungi; more realistically, one would expect a usually deleterious balance between positive and negative effects. Thus, removing a few riparian trees will lower the food base of the fungi and of leaf-shredding invertebrates. It is conceivable that, on balance, the fungi might gain more by being less exposed to the invertebrates than by losing substrata. But drastic reductions in the riparian vegetation result in a clear impoverishment of the fungal community (Metvalli and Shearer 1989; Chergui 1990; Chap. -3). It is due to the dilution of available food resources. A similar effects occurs naturally when the river widens (Nilsson 1964; Chauvet 1989), since leaf input is related primarily to the length of the river edge, while water volume increases with river width (Bird and Kaushik 1981).
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Bärlocher, F. (1992). Human Interference. In: Bärlocher, F. (eds) The Ecology of Aquatic Hyphomycetes. Ecological Studies, vol 94. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-76855-2_9
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DOI: https://doi.org/10.1007/978-3-642-76855-2_9
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