Effects of hydropeaking on drift, stranding and community composition of macroinvertebrates: A field experimental approach in three regulated Swiss rivers
| العنوان: | Effects of hydropeaking on drift, stranding and community composition of macroinvertebrates: A field experimental approach in three regulated Swiss rivers |
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| المؤلفون: | Diego Tonolla, Florian Dossi, Olivier Kastenhofer, Michael Doering, Christoph Hauer, Wolfram Graf, Lisa Schülting |
| المصدر: | River Research and Applications. 39:427-443 |
| بيانات النشر: | Wiley, 2022. |
| سنة النشر: | 2022 |
| مصطلحات موضوعية: | Benthos, 333: Bodenwirtschaft und Ressourcen, Alpine river, Altered flow regime, Environmental Chemistry, Hydropower impact, Aquatic invertebrate, Flow manipulation, General Environmental Science, Water Science and Technology |
| الوصف: | Hydropeaking operation leads to fluctuations in wetted area between base and peak flow and increases discharge-related hydraulic forces (e.g., flow velocity). These processes promote macroinvertebrate drift and stranding, often affecting benthic abundance and biomass. Our field experimental study – conducted in three hydropeaking-regulated Swiss rivers – aimed to quantify (i) the short-term effects of the combined increase in flow amplitude and up-ramping rate based on macroinvertebrate drift and stranding, as well as (ii) long-term effects based on the established community composition. Hydropeaking led to increased macroinvertebrate drift compared to base flow and to unaffected residual flow reaches. Moreover, stranding of macroinvertebrates was positively related to drift, especially during the up-ramping phase. Flow velocity and up-ramping rate were identified as major determinants for macroinvertebrate drift, while flow ratio and down-ramping rate for stranding. Particularly high sensitivity towards HP was found for Limnephilidae, whereas Heptageniidae seemed to be resistant in respect to short and long-term hydropeaking effects. In the long-term, hydropeaking did not considerably reduce benthic density of most taxa, especially of some highly resistant and resilient taxa such as Chironomidae and Baetidae, which dominated the community composition even though they showed comparably high drift and stranding responses. Therefore, we argue that high passive drift and/or stranding, especially of individual-rich taxa, does not necessarily indicate strong hydropeaking sensitivity. Finally, our results demonstrate the necessity to consider the differences in river-specific morphological complexity and hydropeaking intensity, since these factors strongly influence the community composition and short-term drift and stranding response of macroinvertebrates to hydropower pressure. |
| وصف الملف: | application/pdf |
| تدمد: | 1535-1467 1535-1459 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::09e9c3f77ac495cf3422da9caaa8ff84 https://doi.org/10.1002/rra.4019 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....09e9c3f77ac495cf3422da9caaa8ff84 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15351467 15351459 |
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