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  • 1.
    Lepori, Fabio
    et al.
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
    Malmqvist, Björn
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
    Predictable changes in trophic community structure along a spatial disturbance gradient in streams2007In: Freshwater Biology, Vol. 52, p. 2184-2195Article in journal (Refereed)
  • 2.
    Nilsson, Christer
    et al.
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
    Lepori, Fabio
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
    Malmqvist, Björn
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
    Törnlund, Erik
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
    Hjerdt, Niklas
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
    Hjerdt, James M.
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
    Palm, Daniel
    Department of Aquaculture, SLU.
    Östergren, Johan
    Department of Aquaculture, SLU.
    Jansson, Roland
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
    Brännäs, Eva
    Department of Aquaculture, SLU.
    Lundqvist, Hans
    Department of Aquaculture, SLU.
    Forecasting environmental responses to restoration of rivers used as log floatways: an interdisciplinary challenge2005In: Ecosystems (New York. Print), ISSN 1432-9840, E-ISSN 1435-0629, Vol. 8, no 7, p. 779-800Article in journal (Refereed)
    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.

  • 3. Palm, Daniel
    et al.
    Brännäs, Eva
    Lepori, Fabio
    Umeå University, Faculty of Science and Technology, Ecology and Environmental Science.
    Nilsson, Kjell
    Stridsman, Stefan
    The influence of spawning habitat restoration on juvenile brown trout (Salmo trutta) density2007In: Canadian Journal of Fisheries and Aquatic Sciences, Vol. 64, no 3, p. 509-515Article in journal (Refereed)
    Abstract [en]

    Between 1992 and 2003, we assessed the density of age-0+ brown trout (Salmo trutta) in a channelized stream in northern Sweden, which was restored using two different schemes. One section of the stream was restored by the addition of boulders and reconstruction of gravel beds (boulder + gravel section), whereas another section was restored through addition of boulders only (boulder-only section). In addition, we compared the substrate size composition of gravel beds and the egg-to-fry survival between the two stream sections, and we related the density of age-0+ brown trout to the area of reconstructed gravel beds. After the restoration, the density of age-0+ brown trout increased significantly in the boulder + gravel section and was positively correlated with the area of reconstructed gravel beds. By contrast, the density of age-0+ brown trout did not change in the boulder-only treatment. Egg-to-fry survival was significantly higher in the boulder + gravel section compared with the boulder-only section, probably because of the higher content of sand and fines in the gravel beds of the latter treatment. This study shows that the density of age-0+ brown trout was limited by the availability and quality of spawning substrate rather than by the structural habitat complexity.

    De 1992 à 2003, nous avons évalué la densité des truites brunes (Salmo trutta) d'âge 0+ dans un cours d'eau canalisé du nord de la Suède, qui a été restauré selon deux arrangements différents. Une section a été restaurée par l'addition de blocs de pierre et la reconstruction des lits de gravier (section blocs + gravier), alors qu'une autre section n'a reçu que des blocs (section blocs seuls). De plus, nous avons comparé la composition en taille du substrat dans les lits de gravier et la survie de l'oeuf à l'alevin dans les deux sections de cours d'eau; nous avons mis en relation la densité des truites brunes d'âge 0+ à la surface des lits de gravier reconstruits. Après la restauration, la densité des truites brunes d'âge 0+ a augmenté significativement dans la section blocs + gravier où elle est en corrélation positive avec la surface des lits de gravier reconstitués. Au contraire, la densité des truites d'âge 0+ n'a pas changé dans la section ayant reçu les blocs seuls. La survie de l'oeuf à l'alevin est significativement plus importante dans la section blocs + gravier que dans la section blocs seuls, probablement à cause du contenu plus grand de sable de de sédiments fins dans les lits de gravier de cette dernière section. Notre étude montre que la densité des truites d'âge 0+ est limitée par la disponibilité et la qualité des substrats de fraie plutôt que par la complexité structurale de l'habitat.[Traduit par la Rédaction]

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