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• W149739478 abstract "This thesis describes the spatial and temporal variability of benthic macroinvertebratecommunities in Swedish streams and its implications for environmental assessment. Oneof the challenges for environmental assessment is to separate change caused byanthropogenic stress from natural variability, therefore it is essential to have insight in theeffects of temporal and spatial variability on the benthic macroinvertebrates. The thesis isbased on two stream riffle datasets; one spatial (694 streams) and one temporal (6-11years sampling of five streams). Classification of macroinvertebrate communitycomposition showed a gradual change in community composition in Sweden. Ageographical (ecoregional) classification was tested as a starting point for biomonitoring,but I found that local-scale variables such as stream velocity and substratum type wereimportant descriptors and must be taken into account in assessments of running waters.Despite that temporal variability was small relative to the spatial variability, I argue thatthe temporal variability is of importance and that the inherent cyclic and seasonal factorsaffecting benthic macroinvertebrates has to be accounted for in environmental assessment.Surprisingly, the stream macroinvertebrate community composition did not show a largescalepattern (correlation with the limes norrlandicus ecotone, found at ~60° north),whereas a lake dataset showed such a pattern. I speculate that differences between the twoecosystems are caused by differences in detrital retention and stability. Richness indicatormeasures generally had low variability and high statistical power and needed few samplesto detect changes caused by perturbation. In environmental assessment it is important toknow what effect size and variability (spatial and temporal) one can expect from anindicator metric (and hence the macroinvertebrate community) so that the money spent inimpact studies is used in a cost-effective way." @default.
• W149739478 created "2016-06-24" @default.
• W149739478 creator A5071048651 @default.
• W149739478 date "2000-01-01" @default.
• W149739478 modified "2023-09-28" @default.
• W149739478 title "Spatial and temporal variability of stream benthic macroinvertebrates" @default.
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• W149739478 hasPublicationYear "2000" @default.
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