Functional traits of hyporheic and benthic invertebrates reveal importance of wood‐driven geomorphological processes in rivers - Université de Lorraine Access content directly
Journal Articles Functional Ecology Year : 2019

Functional traits of hyporheic and benthic invertebrates reveal importance of wood‐driven geomorphological processes in rivers

Abstract

1. Large wood (LW) is a natural element of river environments and an integral com-ponent of many river restoration schemes to promote biodiversity. It is an impor-tant habitat in itself, but it also induces a wide range of hydraulic, hydrological, geomorphological and chemical conditions that influence the ecological commu-nity. However, the effects of hydro‐geomorphological processes induced by LW on local benthic and hyporheic invertebrates have not been well characterized.2. A functional approach was applied to invertebrate data collected in a field sur-vey at sites with LW and without LW (control) to investigate the response of hy-porheic and benthic invertebrates' trait profiles in response to local LW‐induced processes.3. We hypothesized LW sites to be associated with different trait modalities than control sites in relation to wood‐induced processes and conditions (i.e., hyporheic exchange flow, oxygen availability, temporal stability, organic matter, denitrifica-tion, hydraulic conductivity). Multivariate analyses and partial least squares (PLS) path modelling were used to detect the differences in trait profiles between LW and control sites and to study the variation of traits as a function of hydrological, sedimentological, physical and chemical variables.4. Biological (i.e., aquatic stages, reproduction), physiological (i.e., dispersal, feeding habits) and behavioural (i.e., substrate preferences) trait utilization by the hypor-heic meiofauna differed between LW and control sites. At LW sites, the hyporheic meiofaunal assemblage was significantly associated with aquatic active dispersal, aquatic eggs and hard substrate preferences. This trait category selection was linked to changes in physical–sedimentological processes at LW sites when com-pared to control sites. Macrofaunal benthic and hyporheic functional traits did not differ significantly between wood and control sites, suggesting similar functioning of these assemblages at the surface–subsurface interface.5. This study found that LW affects invertebrate traits by altering fluvial processes to produce, locally, a mosaic of habitats. Hyporheic meiofauna trait responses to LW processes have suggested (a) the crucial role of LW in supporting river benthic zone functioning and thus (b) a possible benefit to river restoration by enhancing functional interactions among different ecological niches.
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hal-03102205 , version 1 (24-01-2024)

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Chiara Magliozzi, Philippe Usseglio‐polatera, Albin Meyer, Robert Grabowski. Functional traits of hyporheic and benthic invertebrates reveal importance of wood‐driven geomorphological processes in rivers. Functional Ecology, 2019, 33 (9), pp.1758-1770. ⟨10.1111/1365-2435.13381⟩. ⟨hal-03102205⟩
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