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Forecasting environmental responses to restoration of rivers used as log floatways: an interdisciplinary challenge
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
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2005 (English)In: Ecosystems (New York. Print), ISSN 1432-9840, E-ISSN 1435-0629, Vol. 8, no 7, 779-800 p.Article in journal (Refereed) Published
Abstract [en]

Log floating in the 19th to mid 20th centuries has profoundly changed the environmental conditions in many northern river systems of the world. Regulation of flow by dams, straightening and narrowing of channels by various piers and wing dams, and homogenization of bed structure are some of the major impacts. As a result, the conditions for many riverine organisms have been altered. Removing physical constructions and returning boulders to the channels can potentially restore conditions for these organisms. Here we describe the history of log driving, review its impact on physical and biological conditions and processes, and predict the responses to restoration. Reviewing the literature on comparable restoration efforts and building upon this knowledge, using boreal Swedish rivers as an example, we address the last point. We hypothesize that restoration measures will make rivers wider and more sinuous, and provide rougher bottoms, thus improving land-water interactions and increasing the retention capacity of water, sediment, organic matter and nutrients. The geomorphic and hydraulic/hydrologic alterations are supposed to favor production, diversity, migration and reproduction of riparian and aquatic organisms. The response rates are likely to vary according to the types of processes and organisms. Some habitat components, such as beds of very large boulders and bedrock outcrops, and availability of sediment and large woody debris are believed to be extremely difficult to restore. Monitoring and evaluation at several scales are needed to test our predictions.

Place, publisher, year, edition, pages
2005. Vol. 8, no 7, 779-800 p.
Keyword [en]
channelization, fish, floatways, forecasting, invertebrate, log floating, recovery, restoration, retention, riparian ecosystems, river, Sweden, transport history
National Category
Ecology Environmental Sciences
Identifiers
URN: urn:nbn:se:umu:diva-7695DOI: 10.1007/s10021-005-0030-9ISI: 000233326500004OAI: oai:DiVA.org:umu-7695DiVA: diva2:147366
Available from: 2008-01-11 Created: 2008-01-11 Last updated: 2016-02-22Bibliographically approved

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Nilsson et al_Ecosystems2005(1128 kB)377 downloads
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Nilsson, ChristerLepori, FabioMalmqvist, BjörnTörnlund, ErikJansson, Roland

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Nilsson, ChristerLepori, FabioMalmqvist, BjörnTörnlund, ErikHjerdt, NiklasHjerdt, James M.Jansson, Roland
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Ecosystems (New York. Print)
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