Abstract
Effects of plant removal on habitat conditions, stream metabolism and benthic invertebrates were studied in two macrophyte-rich streams (Chriesbach, Mühlibach) of the Swiss Plateau. We monitored a control reach (no treatment) and two impact reaches (removal of plants by cutting or dredging) in each stream. Sampling was conducted during a 2–4 month period before and a 9 month period after the removal of 84–94% of the plant biomass. Oxygen concentrations were continuously recorded for 3–4 months. Plant removal decreased water depth and increased current velocity. The total number of invertebrates decreased by about 65%. Plant cutting mainly affected taxa that used macrophytes as habitat. Highly mobile taxa and taxa living on or within the bed sediment were less affected. Invertebrate densities recovered within 4–6 months. The removal of plants resulted only in a moderate increase in nocturnal oxygen concentrations. In the stream where plants were cut in spring, macrophytes recovered within the same growing season. In the other stream, where plant growth started later, plants were cut in summer and no recovery of plants occurred until the following spring.
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Kaenel, B.R., Uehlinger, U. (1999). Aquatic plant management: ecological effects in two streams of the Swiss Plateau. In: Caffrey, J., Barrett, P.R.F., Ferreira, M.T., Moreira, I.S., Murphy, K.J., Wade, P.M. (eds) Biology, Ecology and Management of Aquatic Plants. Developments in Hydrobiology, vol 147. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0922-4_36
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DOI: https://doi.org/10.1007/978-94-017-0922-4_36
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