David Aldvén- PhD
- Researcher at R&D for Generations, Vattenall AB
David Aldvén
- PhD
- Researcher at R&D for Generations, Vattenall AB
About
30
Publications
14,169
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674
Citations
Introduction
My work focuses on making hydropower more environmentally friendly, with a special focus on improving river connectivity, fish passage and survival, as well as lower the overall impact of hydropower on river ecosystems.
Current institution
R&D for Generations, Vattenall AB
Current position
- Researcher
Additional affiliations
April 2011 - February 2016
Education
April 2011 - April 2016
January 2010 - January 2011
September 2006 - December 2009
Publications
Publications (30)
Renewable energy sources such as hydropower are important to reduce the global emissions. Hydropower, however, comes with other environmental challenges by altering the ecological conditions in the rivers. Hydraulic models connected with fish habitat models could be one tool to assess the environmental impacts and evaluate mitigation measures for f...
Populations of the European eel (Anguilla anguilla), a critically endangered species, have been severely impacted by migration barriers, as losses due to turbine-induced mortality can be substantial. To prevent eels from entering turbines, effective guidance systems are needed to redirect downstream-migrating eels towards safer alternative passage...
The European eel is critically endangered due to heavy impact of anthropogenic factors, such as habitat fragmentation, overexploitation and climate change. During downstream migration, silver eels may encounter hydropower plants, which often result in delay or mortality from impingement on trash-racks or turbine passage. These problems can be mitig...
Hydropower plants commonly impede the downstream migration of Atlantic salmon (Salmo salar) kelts. Thus, understanding the effects of hydraulic conditions on kelt behaviour and passage performance at dams is crucial for developing effective mitigation measures. In this study, we investigated the influence of hydraulic conditions on kelt passage per...
When fish migrate downstream, they follow bulk flow and unless enough flow is redirected towards a bypass, they need guidance to pass the dam. Guidance relying on behavioural responses by fish are generally less effective but less expensive than physical guidance structures, and hence there is an interest in finding more effective behavioural guida...
The loss of longitudinal connectivity in regulated rivers, both up- and downstream, has been detrimental for biodiversity worldwide. While progress has been made regarding upstream fish passage solutions, many questions remain unanswered regarding downstream passage alternatives. To address these knowledge gaps, we used Atlantic salmon (S. salar) s...
Known as the "king of fishes," the Atlantic salmon (Salmo salar, Salmonidae) is an iconic freshwater species whose contribution to human well-being has long been recognized , as have widespread declines in its abundance, partly due to river regulation. To understand how salmon conservation has been addressed within the ecosystem services (ES) frame...
![Figure 1. Maps over the case study area, Lantmäteriet [24]. The area...](profile/Kristian-Angele/publication/352246681/figure/fig1/AS:1032689293488128@1623223722855/Maps-over-the-case-study-area-Lantmaeteriet-24-The-area-within-the-black-lines_Q320.jpg)
A new, potentially cost efficient, concept for improving the attraction flow to a fish ladder has been investigated in a case study. For the upstream migrating Atlantic salmon to reach the fish ladder and bypass the case study hydropower plant, it must be able to localize the attraction flow where it enters the main flow from the tailrace of the hy...
Cost-effective implementation of fish-friendly hydropower flow operation and habitat restoration measures require an understanding of their effects on fitness-related behaviours of stream fish. Here, we investigated how changes in flow and bottom structure influence the social behaviour of European grayling, using large experimental flumes (700 L s...
The salmonid fish Brown trout is iconic as a model for the application of conservation genetics to understand and manage local interspecific variation. However, there is still scant information about relationships between local and large‐scale population structure, and to what extent geographic and environmental variables are associated with barrie...
Phenotypic scoring of wild animals under standardized laboratory conditions is important as it allows field ecologists and evolutionary biologists to understand the development and maintenance of interindividual differences in plastic traits (e.g. behaviour and physiology). However, captivity is associated with a shift from a natural familiar envir...
Selection induced by human harvest can lead to different patterns of phenotypic change than selection induced by natural predation and could be a major driving force of evolution of wild populations. The vulnerability of individuals to angling depends on the individual decision to ingest the bait, possibly mediated by their neuroendocrine response...
Movement activity levels of wild animals often differ consistently among individuals, reflecting different behavioural types. Previous studies have shown that lab‐scored activity can predict several ecologically relevant characteristics. In an experiment on wild brown trout S. trutta, spanning from June to October, we investigated how spring swimmi...
The brown trout species complex (Salmo trutta L.) exhibits facultative anadromy whereby a variable proportion of the juvenile trout may either spend their entire life history in the freshwater environment (as resident trout) or migrate into marine environment (as sea trout). The richer feeding conditions in the sea allows the migrants to grow faste...
Methods to estimate Brown trout smolt production are presented.
An overview of the status, monitoring and management of sea trout populations in Denmark, Norway and Sweden is presented and discussed. The sea trout is one of the most important species for the recreational fishery in this region and it is therefore important to regulate and manage stocks in ways that are sustainable. Electro-fishing is clearly th...
1.A phenotypic syndrome refers to complex patterns of integration among functionally related traits in an organism that defines how the organism interacts with its environment and sustains itself.
2.Human-induced biological invasions have become important sources of environmental modifications. However, the extent to which invasive species affect...
The hypothesis that interindividual differences in the activity of brown trout alter the exposure to parasitic freshwater pearl mussel glochidia was tested in a Swedish stream. Wild yearling brown trout (N = 103) were caught, individually tagged for identification and scored for open-field activity during standardized laboratory tests in June. Fift...
Theory suggests that high activity levels in animals increase growth at the cost of increased mortality. This growth-mortality trade-off has recently been incorporated into the wider framework of the pace-of-life syndrome (POLS) hypothesis. However, activity is often quantified only in the laboratory and on a diurnal basis, leaving open the possibi...
Little is known about migratory routes and habitat use of anadromous brown trout Salmo trutta at sea. We therefore conducted a 2 yr study (2011-2012) on sea trout in the River Himleån system (a river, an estuary, and a coastal sea environment) in western Sweden. The main objectives were to investigate migration speed, migration routes, and mortalit...
The deleterious effect of competition for space and food in animals increases with increasing population density. In contrast, familiarity towards conspecifics can relax the intensity of interference competition. Here, we hypothesized that familiarity towards conspecifics mitigates the effect of density-dependent growth and dispersal behaviour in t...
In this paper we demonstrate that eggs from anadromous salmonines can constitute a large proportion of the dietary intake of individual juvenile Atlantic salmon Salmo salar and brown trout Salmo trutta during the spawning period in late autumn. The majority of fish older than 1 year residing on a spawning ground were
found to have ingested eggs fr...
Theory suggests that consistent individual differences in activity are linked to life history where high activity is associated
with rapid growth, high dispersal tendency, and low survival (the pace-of-life syndrome hypothesis). We addressed this influential
hypothesis by combining behavioral studies with fine-scale positional scoring in nature, es...
Several environmental cues have been suggested to govern the initiation of the downstream migration of smolts (e.g. light, temperature and discharge). Here we investigated the effect of these cues on the initiation of the downstream migration in anadromous brown trout and Atlantic salmon in a small river on the Swedish west coast during two consecu...
Ecology Letters (2011) 14: 871–876
Partial migration, whereby only a fraction of the population migrates, is thought to be the most common type of migration in the animal kingdom, and can have important ecological and evolutionary consequences. Despite this, the factors that influence which individuals migrate and which remain resident are poorly u...
Questions
Question (1)
Most studies using eDNA in freshwater seems to be focus on detecting fish species currently occupying a lake/river system. I have read that there is a rapid degradation of eDNA within days to weeks in the water. But am wondering if it would be possible to detect historical eDNA from fish in freshwater sediment to determine how pristine fish communities looked like, say >1-300 years back in time?
