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The importance of detritivore species diversity for maintaining stream ecosystem functioning following the invasion of a riparian plant
Umeå University, Faculty of Science and Technology, Ecology and Environmental Science.
Umeå University, Faculty of Science and Technology, Ecology and Environmental Science.
2002 (English)In: Biological Invasions, Vol. 4, 441-446 p.Article in journal (Refereed) Published
Abstract [en]

The strength of linkages between riparian plants and stream communities can be expected to be influenced by invading plants. While most studies so far have been focussed on the effects of the leaf litter quality of the invader, this study addresses the impact of detritivores on the pool of detritus. In a natural setting, we found that species richness of shredding macroinvertebrates significantly influenced the breakdown rate of an invasive weed species, the Japanese knotweed (Fallopia japonica), which has become a major plant invader along streams and rivers in Europe and North America. Our findings imply that a reduction of the diversity of shredder species, which may be the result of disturbances, could negatively influence stream ecosystems'' capacity of processing knotweed leaves. Although the knotweed showed breakdown rates similar to those of common native tree and shrub species, other exotic leaf species might show considerably slower rates and hence have greater consequences for the ecosystems. We have, in this study, indicated a technique by which the effects of other non-indigenous plants on ecosystem functioning might be considered.

Place, publisher, year, edition, pages
2002. Vol. 4, 441-446 p.
Identifiers
URN: urn:nbn:se:umu:diva-31822DOI: 10.1023/A:1023698121141OAI: oai:DiVA.org:umu-31822DiVA: diva2:295540
Available from: 2010-02-17 Created: 2010-02-17

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Jonsson, MMalmqvist, B

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