Related references
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Article
Marine & Freshwater Biology
Michael J. Bradford
Summary: This article discusses the effects of large hydropower projects on aquatic ecosystems in British Columbia, Canada, and the measures taken over the past 60 years to monitor and mitigate those effects. The emphasis is on the downstream effects on fish populations, and the methods used to predict these effects, as well as the role of adaptive management and alternatives in addressing uncertainties about ecological effects.
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Marine & Freshwater Biology
Nolan N. Bett et al.
Summary: This article discusses the impacts of damming on fish ecosystems and the potential of integrative research in understanding these impacts and conserving populations. Using a case study on Pacific salmon, the authors demonstrate how regulated rivers can be used as experimental systems to study the biology of migratory fish and develop effective management strategies. Through the integration of multiple research approaches, they characterize the effects of water dilution and dam flow releases on navigation, passage success, and survival of adult salmon.
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Marine & Freshwater Biology
Fernando Mayer Pelicice et al.
Summary: This paper investigates the composition and trait turnover among fish assemblages in reservoirs in major Brazilian basins. The results show considerable variation in species and trait composition among reservoirs, with higher similarity within basins. Functional turnover is positively correlated with taxonomic turnover but at lower values. The presence of non-native species is associated with either homogenization or differentiation patterns.
Review
Marine & Freshwater Biology
Christos Katopodis
Summary: Setting e-flows is crucial for hydroelectric and other projects, and Canada has extensive experience and methodologies in this area. The complexity of methods depends on the severity of impacts, particularly on fish and fish habitat. Multi-jurisdictional, legislative, climatic, and geographic challenges exist in determining e-flow regimes.
Article
Marine & Freshwater Biology
Ludmila Moura Moreira Mendes et al.
Summary: This study identifies hydrodynamic alterations in flow downstream of a dam that can attract fish to unsafe areas in the tailrace during their reproductive migration. The study also suggests that the flow velocities in the tailrace are slow but still attractive to mature individuals.
Article
Marine & Freshwater Biology
Eduardo Meneguzzi Brambilla et al.
Summary: This study investigates the dispersal of fish eggs and larvae in a river stretch affected by small hydropower plants in Southeast Brazil. The findings suggest that due to the small size of the studied reservoirs, downstream dispersal of free-flowing eggs and larvae is likely to occur, with the fish ladder facilitating passage through the dam. The study also highlights the impact of rainfall/flow variation and the reproductive cycle stage on the downstream dispersal, with peak rainfall during the summer coinciding with higher abundances. Eggs and larvae drifted downstream through the reservoirs and reached the dams, where they were able to pass through the fish ladder.
Review
Marine & Freshwater Biology
K. E. Smokorowski
Summary: Hydropeaking is a method of hydropower operation that varies electricity generation based on sub-daily changes in flow. While it provides flexibility for energy grid stability, it also has ecological consequences that need to be considered and mitigated.
Article
Marine & Freshwater Biology
Gaute Velle et al.
Summary: The study found higher density of juvenile fish and benthic invertebrates in areas with J. bulbosus, indicating that the vegetation is not limiting the fish and invertebrates. Although adult salmonids may be negatively affected when their spawning grounds are covered by vegetation, overgrowth is not common and fish clear the river bed of macrophytes during redd digging, showing competition between macrophytes and fish for habitat. It is important to recognize that outgrowth of macrophytes may not always have negative impacts on the ecosystem, and to distinguish nuisance to humans from effects on the ecosystem.
Review
Marine & Freshwater Biology
K. Alfredsen et al.
Summary: Sustainable global energy production heavily relies on hydropower, which contributes significantly to green energy production worldwide. Despite some environmental impacts, efforts have been made to mitigate them. Brazil, Canada, and Norway, as three major hydropower producers, share common concerns and interests in the continued sustainable development of hydropower resources.
Article
Marine & Freshwater Biology
Ulrich Pulg et al.
Summary: This study investigated the long-term effects of gravel additions at eight sites in three rivers in western Norway over a period of up to 18 years. Results showed that gravel additions significantly increased juvenile densities of Atlantic salmon and Brown trout, with egg survival rates remaining high. However, the areas covered with gravel were shrinking over time. Construction costs for the gravel augmentations were relatively low, with a cost-benefit ratio that indicated the measure was successful in enhancing salmonid fish reproduction.
Article
Marine & Freshwater Biology
Lilian Paula Vasconcelos et al.
Summary: The study found that fish reproductive activity occurred both upstream of the Jirau Dam and within the Santo Antonio Reservoir. Some ichthyoplankton crossed the Santo Antonio Dam downstream, but at least some of their larval development stages disappeared along the reservoir. A critical section was identified in the last 10 km of the reservoir, possibly due to the drifting characteristics or mortality rates.
Article
Marine & Freshwater Biology
Lorrana Thais Maximo Durville Braga et al.
Summary: The study compared three methods of counting fish manually in the frames of DIDSON software in two Brazilian dams, with qualitative counting being the most congruent with numerical counting.
Article
Marine & Freshwater Biology
Hakon Sundt et al.
Summary: The study found that mesoscale mean depth and velocity were correlated to the number of adult European grayling in river sections, and riverbank sinuosity and the Froude number-based index were significantly correlated with the occurrence of adult European grayling during spawning. These results can help assess how flow-induced changes and channel adjustments at the mesoscale level affect access to relevant habitats for European grayling and brown trout.
Article
Marine & Freshwater Biology
Lisiane Hahn et al.
Summary: The recent large-scale hydropower development in the Amazon basin has raised concerns about the movements of migratory fishes such as goliath catfish. In the Madeira River, the efficiency of a fishway in the Santo Antonio hydropower plant was evaluated using telemetry techniques. The study revealed the inefficiency of the fishway for the target species and led to its reconstruction.
Article
Marine & Freshwater Biology
Sondre Kvalsvik Stenberg et al.
Summary: This study investigated the effects of TDG supersaturation on the survival of Atlantic salmon smolts and found that they may be more vulnerable to TDG supersaturation than Pacific salmonids. The study also provides important data linking the effects of TDG in the laboratory and in the field.
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