The interplay of flow processes shapes aquatic invertebrate successions in floodplain channels - A modelling applied to restoration scenarios

Marle, Pierre; Riquier, Jérémie; Timoner, Pablo; Mayor, Hélène; Castella, Emmanuel

doi:10.1016/j.scitotenv.2020.142081

Cited by 10 publications

(14 citation statements)

References 92 publications

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“…Across the braided floodplain, species composition was associated primarily with shear stress-related connections. This corroborates findings on the Danube River, where hydrological connectivity was the main determinant explaining the distribution of aquatic invertebrates (Reckendorfer et al, 2005;Tockner et al, 1998) and supports the notion that most aquatic invertebrate taxa exhibit a preference for a specific degree of surface connectivity (Arscott et al, 2003;Castella et al, 1991;Marle et al, 2021). The variation in species turnover with increasing shear stress-related connections implies that species turnover is a continuous process related to a continuous variation between floodplain habitats across the lateral dimension of the floodplain (Amoros & Roux, 1988;Bornette et al, 1998;Van den Brink et al, 1996;Ward, 1998).…”

Section: How Is the Diversity Of Invertebrate Assemblages Influenced ...supporting

confidence: 88%

“…Of these 14 variables (seven periods for overflow and seven periods for backflow), we chose the two that most explained the occurrence of species: the upstream overflow and backflow connection durations calculated over 1 year prior to sampling. Following Marle et al (2021), the flow connections calculated over 1 year had approximately twice as much contribution in predictive models than connections calculated over shorter durations. The duration of overflow connection was split according to the associated bed shear stress (i.e.…”

Section: Environmental Variablesmentioning

confidence: 97%

“…Changes in floodplain assemblages, described in this study as species turnover, were clearly linked to the flow variation in the main channel. The influence of thermal inertia on diversity was higher that the role of hydrologic connectivity upon floodplain diversity cannot be reduced to a single process (Amoros & Bornette, 2002;Marle et al, 2021).…”

Section: How Is the Diversity Of Invertebrate Assemblages Influenced ...mentioning

confidence: 99%

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Thermal regime, together with lateral connectivity, control aquatic invertebrate composition in river floodplains

et al. 2022

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Large river floodplains are dynamic environments, where alternating low and high flows are key ecological processes shaping aquatic biota. As a result of fluctuations in flow in floodplain channels, the diversity of benthic assemblages is assumed to result from the balance between surface flow connections, which are dominant during high flows, and groundwater inputs, which are dominant during low flows. However, the relative importance of these inputs in explaining aquatic invertebrate diversity has never been tested. The response of aquatic invertebrates to hydrological changes of a river floodplain was investigated in seven braided and six braided–anastomosed floodplain channels of the French upper Rhône River that are fed by three different processes: groundwater supply (which controls the thermal inertia of the water bodies), surface slow flow connections (i.e. diffuse overbank flows; passive overflow), and surface shear stress‐related connections (i.e. condensed flows; active overflow) during high flows. Generalised dissimilarity models indicated that floodplain invertebrate composition had complex relationships with the three processes considered. The relative importance of the latter appeared dependent upon the morphology of the floodplain channels. In the braided channels, the effects of shear stress‐related connections were more prominent than in the anastomosed ones, for which the effects of the three processes were more similar. Overall, the diversity of flow connections, that is, lateral surface water connections (both shear stress‐related and slow, as defined above) and vertical connection with groundwater (inferred through thermal inertia) enhanced the species turnover at the reach scale. Thermal inertia influenced invertebrate composition when, during low flow periods, surface flow connections had limited effect. Our results highlighted that the role of hydrologic connectivity upon floodplain diversity cannot be reduced to a single process. They also indicate the importance of vertical connectivity for maintaining biodiversity in floodplain habitats where surface flow connectivity is neither frequent nor constant.

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Section: How Is the Diversity Of Invertebrate Assemblages Influenced ...supporting

confidence: 88%

Section: Environmental Variablesmentioning

confidence: 97%

Section: How Is the Diversity Of Invertebrate Assemblages Influenced ...mentioning

confidence: 99%

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Thermal regime, together with lateral connectivity, control aquatic invertebrate composition in river floodplains

et al. 2022

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“…Ponton channel (PONT) is located downstream of the hydroelectric scheme and hydropeaking usually causes daily discharge fluctuations from Monday to Friday (between ~200 and ~500 m 3 s −1 ). Upstream flow connections occur during high floods for less than one day per year for both floodplain channels on average [41]. The two floodplain channels vary in length (1220 m for MOLO and 910 m for PONT) and geographic position (4 km between the two channels).…”

Section: Studied Sitesmentioning

confidence: 99%

Size–Abundance Relationships of Freshwater Macroinvertebrates in Two Contrasting Floodplain Channels of Rhone River

Gjoni

Marle

Ibelings

et al. 2022

Water

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Body size is perhaps the most fundamental property of an organism and its relationship with abundance is one of the most studied relationships in ecology. Although numerous studies have examined these relationships in local communities, few have investigated how they vary at different temporal and spatial scales. We investigated the relationship between body size and abundance of local macroinvertebrate communities in two floodplain channels of the French upper Rhone River. The two channels differ in their vegetation coverage (high vs. low vegetation) and hydrological regimes. The shapes of the size–abundance relationship were similar between channels on a yearly basis but differed when compared between months. The variation in local size–abundance relationships between months was related to variation in the functional diversity across time. Our findings suggest that local size–abundance relationships are able to quantitatively describe temporal changes in community structure, showing the importance of relating diversity with ecosystem function in a more realistic context.

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“…With the potential to separate the signal from the noise (error), statistical approaches may be better suited to answering well-defined ecological questions. Model-based approaches (e.g., linear regression methods) provide the framework for prediction (i.e., for a unit increase in x there is a change in y) and can be used to quantify a priori expectations of restoration action (e.g., [104]). An algorithm-based approach uses summary statistics (e.g., pairwise measures of dissimilarity) generated from the observed data to look for patterns of association [105].…”

Section: Discussionmentioning

confidence: 99%

Best Practices for Monitoring and Assessing the Ecological Response to River Restoration

England

Angelopoulos²,

Cooksley

et al. 2021

Water

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Nature-based solutions are widely advocated for freshwater ecosystem conservation and restoration. As increasing amounts of river restoration are undertaken, the need to understand the ecological response to different measures and where measures are best applied becomes more pressing. It is essential that appraisal methods follow a sound scientific approach. Here, experienced restoration appraisal experts review current best practice and academic knowledge to make recommendations and provide guidance that will enable practitioners to gather and analyse meaningful data, using scientific rigor to appraise restoration success. What should be monitored depends on the river type and the type and scale of intervention. By understanding how habitats are likely to change we can anticipate what species, life stages, and communities are likely to be affected. Monitoring should therefore be integrated and include both environmental/habitat and biota assessments. A robust scientific approach to monitoring and appraisal is resource intensive. We recommend that appraisal efforts be directed to where they will provide the greatest evidence, including ‘flagship’ restoration schemes for detailed long-term monitoring. Such an approach will provide the evidence needed to understand which restoration measures work where and ensure that they can be applied with confidence elsewhere.

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The interplay of flow processes shapes aquatic invertebrate successions in floodplain channels - A modelling applied to restoration scenarios

Cited by 10 publications

References 92 publications

Thermal regime, together with lateral connectivity, control aquatic invertebrate composition in river floodplains

Thermal regime, together with lateral connectivity, control aquatic invertebrate composition in river floodplains

Size–Abundance Relationships of Freshwater Macroinvertebrates in Two Contrasting Floodplain Channels of Rhone River

Best Practices for Monitoring and Assessing the Ecological Response to River Restoration

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