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• W2899019628 abstract "Abstract Dams and weirs degrade river ecosystems, reducing diversity and altering the assemblage composition of aquatic biota. These structures may damage rivers by disrupting longitudinal connectivity, fragmenting rivers, and isolating populations. We tested whether a weir could impede the downstream dispersal of stream insects by comparing drift rates through natural pools and through a weir pool. For three of four of our study taxa ( Offadens spp., Austrosimulium spp., and Simsonia spp.), we found the numbers of drifters were consistently reduced by the weir across multiple occasions (reduction ranging from 68 to 98%) to a higher degree than natural pools (reduction ranging from 24 to 41%). Drift of Cheumatopsyche spp. through the weir was greatly reduced in December (−95%) compared with natural pools, but the weir had little effect during April (−9%). There were size‐related patterns in drift through the weir pool for some taxa. In the weir pool, emigrating individuals of Austrosimulium spp. were significantly smaller than immigrating individuals, which was not observed in natural pools. In contrast, significant reductions of Cheumatopsyche spp. drifters through the weir only occurred when individuals were small (December). Within the weir pool, the combined effects of lower average water velocity, multiple large low velocity areas, and the weir wall were likely to be the cause of the reduction in stream insect drift through the weir. The impediment of drift of some taxa by weirs may affect dispersal and colonisation processes. This obstruction of downstream movement could undermine the outcomes of river restoration projects." @default.
• W2899019628 created "2018-11-09" @default.
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• W2899019628 date "2018-10-30" @default.
• W2899019628 modified "2023-10-02" @default.
• W2899019628 title "Barriers to dispersal: The effect of a weir on stream insect drift" @default.
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• W2899019628 doi "https://doi.org/10.1002/rra.3377" @default.
• W2899019628 hasPublicationYear "2018" @default.
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