| publications-2481 |
Peer reviewed articles |
2021 |
Kerr, J.R., Vowles, A.S., Crabb, M.C. and Kemp, P.S. |
Selective fish passage: Restoring habitat connectivity without facilitating the spread of a non-native species |
Journal of Environmental Management |
10.1016/j.jenvman.2020.110908 |
AI & Machine Learning |
Precipitation & Ecological Systems |
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No abstract available |
689682 |
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| publications-2482 |
Peer reviewed articles |
2021 |
Stéphane Tétard; Romain Roy; Nils Teichert; Jocelyn Rancon; Dominique Courret |
Temporary turbine and reservoir level management to improve downstream migration of juvenile salmon through a hydropower complex |
https://hal.archives-ouvertes.fr/hal-03181067 |
10.1051/kmae/2021004 |
Data Management & Analytics |
Natural Water Bodies |
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Developing management rules to improve downstream migration of salmon smolts in large hydropower plants is essential to limit mortality and migration delay. A 2-year telemetry study was conducted to assess the efficiency of temporary measures to enhance the safety and speed of juvenile salmon passage through the Poutès dam (Allier River, France). 124 smolts were tracked through the reservoir and downstream of the dam, during implementation of turbine modulation and/or shutdown during night and reservoir level lowering. Level lowering significantly reduced median residence time from 3.4 days to 4.4 hours. However, even with high spill during turbine modulation, the risk of smolt being drawn toward the turbines was increased at low reservoir level due to the site's configuration, greater proximity to the surface and weak repulsive effect of the rack. Moreover, results revealed that a substantial proportion of smolts can migrate during daytime and twilight during floods, even at the beginning of the migration period. Thus targeted turbine shutdown has a good potential to protect smolts, but implementation requires studies taking account of site specificities and a flexible approach. |
689682 |
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| publications-2483 |
Peer reviewed articles |
2021 |
Elena Arboleya, Sara Fernández, Laura Clusa, Eduardo Dopico, Eva Garcia-Vazquez |
River Connectivity is Crucial for Safeguarding Biodiversity but May be Socially Overlooked. Insights From Spanish University Students |
Frontiers in Environmental Science |
10.3389/fenvs.2021.643820 |
AI & Machine Learning |
Precipitation & Ecological Systems |
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The social value of natural aquatic ecosystems is very important to set management priorities. River connectivity is essential for the conservation of freshwater ecosystems because barriers alter both abiotic conditions and the biotic communities, compromising biodiversity; however, the appreciation of this river feature has been insufficiently considered in socio-environmental studies that are mainly focused on the acceptance of new dams. Here we used a willingness to pay approach to estimate the value of connectivity, native species, fish diversity (measured as functional diversity or as species richness), fish abundance and environmental quality in three groups of students of different educational background in Asturias (NW of Spain). As in other studies where they are more sensitive to environmental issues, educational sciences students would pay more to conserve and improve river conditions than students of other disciplines. Connectivity was the least valued river feature by students of educational and natural sciences, and the third (before biodiversity and fish abundance) by engineering students. We measured the same features on lowland reaches of four coastal rivers in the Bay of Biscay, and applied declared will amounts to model their appreciation. Differences between the river ranks obtained from functional diversity (that changes with non-native species) and species richness, and small differences between students of different disciplines in the gap between most and least preferred rivers arise from the model. This indicates the importance to involve diverse stakeholder sectors in decisions about rivers. The importance of river connectivity in the conservation of local biodiversity should be explained to general public, perhaps through environmental campaigns. |
689682 |
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| publications-2484 |
Peer reviewed articles |
2021 |
Teja P. Muha, Deiene Rodriguez-Barreto, Richard O'Rorke, Carlos Garcia de Leaniz and Sofia Consuegra |
Using eDNA Metabarcoding to Monitor Changes in Fish Community Composition After Barrier Removal |
Frontiers in Ecology and Evolution |
10.3389/fevo.2021.629217 |
AI & Machine Learning |
Natural Water Bodies |
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Artificial instream barriers are a major cause of habitat fragmentation that reduce population connectivity and gene flow by limiting fish movements. To mitigate their impacts, obsolete barriers are increasingly been removed worldwide, but few barrier removal projects are monitored. We employed a powerful Before-After-Downstream-Upstream (BADU) approach using environmental DNA (eDNA) metabarcoding to examine the effects on fish community composition of removing a weir in the river Lugg (England) that had been suggested to have a detrimental effect on salmonid migration. We found no change in fish community diversity or relative abundance after the removal above or below the weir, but detected an important effect of sampling season, likely related to the species' life cycles. eDNA detected nine fish species that were also identified by electrofishing sampling and one additional species (Anguilla anguilla) that was missed by traditional surveys. Our results suggest that monitoring of barrier removal projects should be carried out to ensure that any ecological benefits are properly documented and that eDNA metabarcoding is a sensitive technique to monitor the effects of barrier removal. |
689682 |
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| publications-2485 |
Peer reviewed articles |
2021 |
Sofia Consuegra; Richard O'Rorke; Deiene Rodriguez-Barreto; Sara Fernandez; Joshua Jones; Carlos Garcia de Leaniz |
Impacts of large and small barriers on fish assemblage composition assessed using environmental DNA metabarcoding |
Science of The Total Environment |
10.1016/j.scitotenv.2021.148054 |
Hydrological modeling |
Precipitation & Ecological Systems |
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No abstract available |
689682 |
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| publications-2486 |
Peer reviewed articles |
2020 |
Jones, P.E., Svendsen, J.C., Borger, L., Champneys, T., Consuegra, S., Jones, J.A.H., Garcia de Leaniz |
One size does not fit all: inter- and intraspecific variation in the swimming performance of contrasting freshwater fish |
Conservation Physiology, |
10.1093/conphys/coaa126 |
Hydrological modeling |
Precipitation & Ecological Systems |
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AbstractArtificial barriers cause widespread impacts on freshwater fish. Swimming performance is often used as the key metric in assessing fishes’ responses to river barriers. However, barrier mitigation is generally based on the swimming ability of salmonids and other strong swimmers because knowledge of swimming ability for most other freshwater fish is poor. Also, fish pass designs tend to adopt a ‘one size fits all’ approach because little is known about population or individual variability in swimming performance. Here, we assessed interspecific and intraspecific differences in the sustained swimming speed (Usus) of five freshwater fish with contrasting body sizes, morphologies and swimming modes: topmouth gudgeon, European minnow, stone loach, bullhead and brown trout. Significant Usus variation was identified at three organizational levels: species, populations and individual. Interspecific differences in Usus were as large as 64 cm s−1, upstream populations of brown trout showed mean Usus 27 cm s−1 higher than downstream populations, and species exhibited high individual variation (e.g. cv = 62% in European minnow). Sustained swimming speed (Usus) increased significantly with body size in topmouth gudgeon, European minnow and brown trout, but not in the two benthic species, bullhead and stone loach. Aerobic scope had a significant positive effect on Usus in European minnow, stone loach and brown trout. Sustained swimming speed (Usus) decreased with relative pectoral fin length in European minnow and brown trout, whereas body fineness was the best predictor in stone loach and bullhead. Hence, swimming performance correlated with a diverse range of traits that are rarely considered when predicting fish passage. Our study highlights the dangers of using species’ average swimming speeds and illustrates why a ‘one size fits all’ approach often fails to mitigate for barrier effects. We call for an evidence-based approach to barrier mitigation, one that recognizes natural variability at multiple hierarchical levels. |
689682 |
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| publications-2487 |
Peer reviewed articles |
2021 |
Wuijts, Susanne Jacqueline Claessens, Luke Farrow, Donnacha G. Doody, Susanne Klages, Chris Christophoridis, Rozalija Cvejić, Matjaž Glavan, Ingrid Nesheim, Froukje Platjouw, Isobel Wright, Jenny Rowbottom, Morten Graversgaard, Cors van den Brink, Inês Leitão, António Ferreira, Sandra Boekhold |
Protection of drinking water resources from agricultural pressures: Effectiveness of EU regulations in the context of local realities |
Journal of Environmental Management |
10.1016/j.jenvman.2021.112270 |
AI & Machine Learning |
Uncategorized |
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No abstract available |
727984 |
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| publications-2488 |
Peer reviewed articles |
2020 |
Dimitris Kofinas, Rafal Ulanczyk, Chrysi S. Laspidou |
Simulation of a Water Distribution Network with Key Performance Indicators for Spatio-Temporal Analysis and Operation of Highly Stressed Water Infrastructure |
Water |
10.3390/w12041149 |
Data Management & Analytics |
Uncategorized |
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An annual and lumped water balance assessment of a water distribution network is recommended by the International Water Association as a first step and prerequisite for improving the performance of the network by minimizing real/physical water losses, burst incidents, water theft, nonrevenue water, and energy consumption, among others. The current work suggests a modeling approach for developing the water balance of a network spatio-temporarily, in hour time-scale and neighborhood granularity. It exploits already established key performance indicators and introduces some new ones to highlight the potential in improving the management of a water distribution network when having a detailed spatio-temporal supervision, especially when the spatial and temporal conditions are variable. The methodology is applied in a seasonally touristic and hilly case study. Additionally, a pressure management scheme is applied to further exploit the potential of such a toolkit. For the investigated case study, the town of Skiathos, the annual real losses are estimated equal to 50.9–52.2% of the system input volume, while apparent losses are estimated to be about 5.6–6.6%. Losses depict intense seasonal variability. Real losses range from 38.8–39.6% in summer months to 63.3–64.7% in winter months, while apparent losses range from 8.4–9.3% in summer to 1.3–2.5% in winter. Annual water theft is estimated to be at least 3.6% of system input volume. Spatial variability, which is linked to the elevation and the different urban land uses is proven to play a significant role in the neighborhoods’ water balances and various key performance indicators are suggested and applied for the pressure control scheme. The annual potential savings due to the applied scheme rise up to 51,300 m3 for leakage and 53,730 m3 for pressure-driven demand. |
734409 |
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| publications-2489 |
Peer reviewed articles |
2021 |
Mauro Fernandes Pereira, Apostolos Apostolakis |
Combined Structural and Voltage Control of Giant Nonlinearities in Semiconductor Superlattices |
Nanomaterials |
10.3390/nano11051287 |
Hydrological modeling |
Precipitation & Ecological Systems |
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Recent studies have predicted a strong increase in high harmonic emission in unbiased semiconductor superlattices due to asymmetric current flow. In parallel, an external static bias has led to orders of magnitude control of high harmonics. Here, we study how this control can affect the operation of superlattice multipliers in a range of input frequencies and powers delivered by commercially available GHz sources. We show that the strongly nonlinear behavior can lead to a very complex scenario. Furthermore, it is natural to ask what happens when we combine both asymmetry and voltage control effects. This question is answered by the simulations presented in this study. The efficiency of high-order even harmonics is increased by the combined effects. Furthermore, the development of ‘petals’ in high-order emission is shown to be more easily achieved, opening the possibility to very interesting fundamental physics studies and more efficient devices for the GHz–THz range. |
832876 |
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| publications-2490 |
Peer reviewed articles |
2020 |
Nikolaos K. Mellios, S. Jannicke Moe, Chrysi Laspidou |
Using Bayesian hierarchical modelling to capture cyanobacteria dynamics in Northern European lakes |
Water Research |
10.1016/j.watres.2020.116356 |
Hydrological modeling |
Precipitation & Ecological Systems |
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No abstract available |
734409 |
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