Modelling macroinvertebrate hydraulic preferences in alpine streams - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles Hydrological Processes Year : 2023

Modelling macroinvertebrate hydraulic preferences in alpine streams

Abstract

Alpine streams face rapid hydrological changes due to the effects of global warming, glacier melting, and increased water uses such as hydropower production. Defining environmental flows (e-flow) is crucial to mitigate the ecological impacts of flow alterations. Among e-flow assessment methods, hydraulic habitat models predict changes in habitat suitability for aquatic species under different flow scenarios. They couple hydraulic models of stream reaches with biological models relating the abundance of taxa to microhabitat hydraulics. However, there is currently no suitable biological models for alpine, often fishless streams. In this study, we develop biological models for dominant macroinvertebrate taxa in alpine streams and compare their responses to hydraulics with those published in lowland streams. Using data collected in 150 microhabitats along a gradient of shear stress within five alpine streams, we performed generalized linear mixed models relating macroinvertebrate abundance to microhabitat hydraulics (shear stress, flow velocity, Froude number and water depth). We developed biological models for 41 taxa, and observed significant microhabitat selection for shear stress (18 taxa), velocity (20), Froude number (21), and depth (11). Most of them presented consistent responses across studied alpine streams, with shear stress and velocity as the main drivers. For common taxa, shapes of macroinvertebrate responses to hydraulics were comparable with those observed in lowland streams. Nevertheless, taxa preferred slightly lower shear stress in alpine streams compared to lowland streams, probably due to high-fine sediment and oxygen concentrations, especially for taxa feeding on autochthonous organic matter. Many (23%) abundant taxa are rheophilic in alpine streams, thereby threatened by flow reduction, including the glacial stream specialists Diamesinae and Rhithrogena delphinensis, which will be also affected by glacier retreat. Combined with hydraulic models, our biological models will facilitate more robust e-flow assessments, thereby reducing the impacts of flow alterations on alpine aquatic ecosystems.
Fichier principal
Vignette du fichier
2023_Becquet_Hydrol_Processes.pdf (1.94 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive
Licence : CC BY - Attribution

Dates and versions

hal-04044901 , version 1 (24-03-2023)

Licence

Attribution

Identifiers

Cite

Juliette Becquet, Nicolas Lamouroux, Maxence Forcellini, Sophie Cauvy‐fraunié. Modelling macroinvertebrate hydraulic preferences in alpine streams. Hydrological Processes, 2023, 37 (2), pp.e14806. ⟨10.1002/hyp.14806⟩. ⟨hal-04044901⟩
23 View
23 Download

Altmetric

Share

Gmail Facebook X LinkedIn More