Hydraulic management of coastal freshwater marsh to conciliate local water needs and fish passage

Guiot, Léo; Cassan, Ludovic; Dorchies, David; Sagnes, Pierre; Belaud, Gilles

doi:10.1080/24705357.2020.1792364

Cited by 6 publications

(5 citation statements)

References 36 publications

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“…Eel‐specific fishways pass a proportion of juvenile eel (Environment Agency, 2011; Watz et al, 2019) but are unsuitable for most other species. Tide flaps and management of sluices can also be used to support the passage of eels in tidal reaches (Environment Agency, 2011; Wright, Wright & Kemp, 2015; Guiot et al, 2020). Unlike these mitigation measures, barrier removal reinstates hydrological connectivity, more natural habitat, sediment transport, and free movement of aquatic biota (Roni, Hanson & Beechie, 2008; Kemp & O'Hanley, 2010; O'Hanley, 2011).…”

Section: Introductionmentioning

confidence: 99%

Rapid response of fish and aquatic habitat to removal of a tidal barrier

Sun

Galib

Lucas

2021

Aquatic Conservation

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1. River barrier removal is used increasingly as a conservation tool to restore lotic habitat and river connectivity, but evidence of its efficacy is incomplete. This study used a before-after methodology to determine the effects of removing a tidal-limit barrier on the fishes, macroinvertebrates, and habitats of an English coastal stream.2. Following barrier removal, habitat diversity increased immediately upstream and remained similar downstream. Mobilized silt altered the substrate composition immediately downstream, but this was temporary as silt was flushed out the following winter. Changes to macroinvertebrate communities occurred upstream and downstream of the former barrier but these were transient. 3.A dramatic and sustained increase in fish density occurred immediately upstream of the barrier after its removal, but effects downstream were minor. The fish community upstream changed, largely due to rapid recruitment and dispersal of endangered European eel (Anguilla anguilla). Eel density in the formerly impounded zone increased from 0.5 per 100 m 2 before barrier removal to 32.5 per 100 m 2 5 months after removal. By 17 months after barrier removal there was no difference in eel density across the six sections sampled. 4. Although resident stream fishes such as bullhead (Cottus gobio species complex, protected under the European Habitats Directive) were abundant in middle and upper-stream sections, brown trout (Salmo trutta, a listed species for biodiversity conservation in England and Wales) density remained low during the study and recruitment was poor. This suggests that although colonization access for anadromous trout was available, habitat upstream may have been unsuitable for reproduction, indicating that wider catchment management is required to complement the restoration of connectivity.5. These findings suggest that tidal barrier removal is an effective method of restoring lotic habitats and connectivity, and can be beneficial for resident and migratory fishes including those of conservation importance (e.g. European eel) in coastal streams.

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Section: Introductionmentioning

confidence: 99%

Rapid response of fish and aquatic habitat to removal of a tidal barrier

Sun

Galib

Lucas

2021

Aquatic Conservation

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“…In these so‐called research and development clusters, OFB managers are hosted in research institutes or universities to work closely with academics on applied research questions (e.g. in ecohydraulics, Guiot et al, 2023, on the ecology of lake ecosystems, Salmon et al, 2022, or on fisheries management, Drouineau et al, 2021), and support public policies on water and biodiversity by identifying priority scientific and technical needs.…”

Section: Recommendations and Conclusionmentioning

confidence: 99%

Building spaces of interactions between researchers and managers: Case studies with wildlife monitoring and conservation in France

Couturier

Bauduin

Astruc

et al. 2023

Ecol Sol and Evidence

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To document and halt biodiversity loss, monitoring, quantifying trends and assessing management and conservation strategies on wildlife populations and communities are crucial steps. With increasing technological innovations, more and more data are collected and new quantitative methods are constantly developed. These rapid developments come with an increasing need for analytical skills, which are hardly accessible to managers. On the other hand, researchers spend more and more time on research grant applications and administrative tasks, which leaves fewer opportunities for knowledge transfer. This situation tends to increase the gap between researchers and managers. Here, we illustrate how to fill this gap by presenting two long‐term collaborations between a research unit—Centre for Functional and Evolutionary Ecology; CEFE—and a national agency—French Biodiversity Agency; OFB. The first example is a collaboration providing statistical support to national parks for the design and implementation of scientific monitoring protocols. It relies on the recruitment of a research engineer funded by OFB and physically based at CEFE, who works closely with OFB and managers. The second example is a collaboration on the management of large carnivores. For more than 10 years, it has involved several PhD students and post‐doctoral fellows co‐supervised by CEFE and OFB, and has recently resulted in the recruitment of a permanent OFB researcher who works half‐time at CEFE and half‐time at OFB. These case studies illustrate the modalities of collaborative work between public institutions acting at different levels of biodiversity conservation for the co‐construction of research agendas and the exchange of knowledge. These collaborations also bring out some challenges. Inter‐knowledge and mutual learning remain difficult at scales larger than that of the teams concerned. The staff working at this interface needs to possess good listening skills, respect all partners' needs and demonstrate flexibility. Knowledge exchanges require time, thus reducing productivity according to quantitative metrics such as scientific publications or institutional reports. These collaborations can therefore be difficult to assume socially, and remain tenuous because they rely on a good understanding of the differences in governance of the various partners. Based on our experience, success is favoured by long‐term and close relationships, and by co‐construction of projects at early stage. Sharing a space (i.e. office or building) facilitates face‐to‐face interactions during planned work sessions and casual meetings that build up a shared scientific culture and mutual trust.

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“…For example, by ensuring an adequate design of the wheel, with tip blades close to the bed bottom, it is possible to ensure free flow of sediments while avoiding silting. For anthropized natural systems, the water wheel can also ensure the free circulation of natural species present in the hydraulic system [17,18]. Eventually, HPW can also avoid the problem of floats usually present in the recirculation zone upstream of the gates.…”

Section: Regulation Of Water Levelsmentioning

confidence: 99%

Hydrostatic Pressure Wheel for Regulation of Open Channel Networks and for the Energy Supply of Isolated Sites

et al. 2021

Self Cite

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The Hydrostatic Pressure Wheel is an innovative solution to regulate flow discharges and waters heights in open channel networks. Indeed, they can maintain a water depth while producing energy for supplying sensors and a regulation system. To prove the feasibility of this solution, a complete model of water depth–discharge–rotational speed relationship has been elaborated. The latter takes into account the different energy losses present in the turbine. Experimental measurements achieved in IMFT laboratory allowed to calibrate the coefficients of head losses relevant for a large range of operating conditions. Once the model had been validated, an extrapolation to a real case showed the possibility of maintaining upstream water level but also of being able to produce sufficient energy for supplying in energy isolated sites. The solution thus makes it possible to satisfy primary energy needs while respecting the principles of frugal innovation: simplicity, robustness, reduced environmental impact.

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Hydraulic management of coastal freshwater marsh to conciliate local water needs and fish passage

Cited by 6 publications

References 36 publications

Rapid response of fish and aquatic habitat to removal of a tidal barrier

Rapid response of fish and aquatic habitat to removal of a tidal barrier

Building spaces of interactions between researchers and managers: Case studies with wildlife monitoring and conservation in France

Hydrostatic Pressure Wheel for Regulation of Open Channel Networks and for the Energy Supply of Isolated Sites

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