Explanipedia

UAV Imaging of the Riverbed in Small, Tree-Lined Streams: Importance of the Light Environment Open

Richard D. Hedger, Marie‐Pierre Gosselin · 2025

Unmanned aerial vehicles (UAVs) are an ideal platform for the remote sensing of riverbeds in small, tree-lined streams, allowing unobstructed viewing of the channel at high spatial resolution. However, effective UAV surveying of these rive…

UAV Imaging of the Riverbed in Small Tree-Lined Streams: Importance of the Light Environment Open

Richard D. Hedger, Marie‐Pierre Gosselin · 2025

UAVs are an ideal platform for remote sensing of riverbeds in small, tree-lined streams, allowing unobstructed viewing of the channel at high spatial resolution. However, effective UAV surveying of these riverbeds is hindered by a range of…

Land efficiency of renewable energy in Norway: A synthesis of footprint and production density Open

Mahmoud Saber Refaei Kenawi, Richard D. Hedger, Knut Alfredsen, Brett K. Sandercock, Magnus Korpås , et al. · 2025

Synthesis of Footprint and Production Density for Solar, Hydro, and Onshore Wind in Norway Open

Mahmoud Saber Rafaei Kenawi, Richard D. Hedger, Knut Alfredsen, Brett K. Sandercock, Magnus Korpås , et al. · 2025

Synthesis of Footprint and Production Density for Solar, Hydro, and Onshore Wind in Norway Open

Mahmoud Saber Rafaei Kenawi, Richard D. Hedger, Knut Alfredsen, Magnus Korpås, Brett K. Sandercock , et al. · 2025

Evaluating environmental impacts of micro, mini and small hydropower plants in Norway Open

Richard D. Hedger, Mahmoud Saber Rafaei Kenawi, Line Elisabeth Sundt-Hansen, Tor Haakon Bakken, Brett K. Sandercock · 2024

Small-scale hydropower plants with an installed capacity <10 MW are an important part of Norway's local and regional development. Small-scale facilities have been viewed as a relatively environmentally friendly form of energy production be…

Assessment of activity and heart rate as indicators for acute stress in Atlantic salmon Open

Nina Bloecher, Richard D. Hedger, Bengt Finstad, Rolf Erik Olsen, Finn Økland , et al. · 2024

The aim of this study was to assess whether activity and heart rate sensor implants can be used to measure stress and thus estimate one important welfare indicator for fish in aquaculture pens, and if such measurements correlate to physiol…

Evaluating Environmental Impacts of Micro, Mini and Small Hydropower Plants in Norway Open

Richard D. Hedger, Mahmoud Saber Rafaei Kenawi, Line Elisabeth Sundt-Hansen, Tor Haakon Bakken, Brett K. Sandercock · 2024

Automated fluvial hydromorphology mapping from airborne remote sensing Open

Richard D. Hedger, Marie‐Pierre Gosselin · 2023

Mapping fluvial hydromorphology is an important part of defining river habitat. Mapping via field sampling or hydraulic modeling is however time consuming, and mapping hydromorphology directly from remote sensing data may offer an efficien…

Energy Flexibility-Environmental Outcomes Tradeoffs Workshop Report and Research Roadmap Open

Brenda M. Pracheil, Vishvas Chalishazar, Linn Emelie Schäffer, Atle Harby, Richard D. Hedger , et al. · 2023

The U.S. Department of Energy (DOE) and Norway’s Royal Ministry of Petroleum and Energy signed an Annex to a previously signed memorandum of understanding (MOU) in February 2020 to collaborate on hydropower research and development (R&D). …

Exploring sensitivities to hydropeaking in Atlantic salmon parr using individual‐based modelling Open

Richard D. Hedger, Line Elisabeth Sundt-Hansen, Ana Juárez‐Gómez, Knut Alfredsen, Anders Foldvik · 2023

Hydropeaking (the release of water pulses at hydropower plants) results in temporary reductions in river channel water‐covered area downstream, which may cause fish mortality through stranding. We used a mechanistic modelling approach to e…

Diving and feeding of adult Atlantic salmon when migrating through the coastal zone in Norway Open

Richard D. Hedger, Mari Kjellman, EB Thorstad, John Fredrik Strøm, Audun H. Rikardsen · 2022

Atlantic salmon post-spawners from a population in northern Norway were tagged with data storage tags ( N = 773), and the depth use and diving behaviour of recaptured individuals within the coastal zone were examined, both on their outward…

Modelling the downstream longitudinal effects of frequent hydropeaking on the spawning potential and stranding susceptibility of salmonids Open

Anton Burman, Richard D. Hedger, J. Gunnar I. Hellström, Anders G. Andersson, Line Elisabeth Sundt-Hansen · 2021

Hydropower plant operating conditions are expected to change to be more in tandem with intermittent power production so as to meet the requirements of the Paris Agreement, which in turn may negatively impact ecological conditions downstrea…

Redefining the oceanic distribution of Atlantic salmon Open

Audun H. Rikardsen, David Righton, John Fredrik Strøm, Eva B. Thorstad, Patrick Gargan , et al. · 2021

Validation of a Swimming Direction Model for the Downstream Migration of Atlantic Salmon Smolts Open

Marcell Szabó‐Mészáros, Ana Silva, Kim Magnus Bærum, Henrik Baktoft, Knut Alfredsen , et al. · 2021

Fish swimming performance is strongly influenced by flow hydrodynamics, but little is known about the relation between fine-scale fish movements and hydrodynamics based on in-situ investigations. In the presented study, we validated the et…

Modeling salmon lice effects on sea trout population dynamics using an individual-based approach Open

Richard D. Hedger, Ola H. Diserud, Bengt Finstad, Arne J. Jensen, DK Hendrichsen , et al. · 2021

Salmon lice Lepeophtheirus salmonis infestation of sea trout Salmo trutta results in both additional marine mortality and behavioral changes which may contribute to sea trout population decline. For effective management of activities that …

Heart rate and swimming activity as indicators of post-surgical recovery time of Atlantic salmon (Salmo salar) Open

Martin Føre, Eirik Svendsen, Finn Økland, Albin Gräns, Jo Arve Alfredsen , et al. · 2021

Heart rate and swimming activity as indicators of post-surgical recovery time of Atlantic salmon (Salmo salar) Open

Martin Føre, Eirik Svendsen, Finn Økland, Albin Gräns, Jo Arve Alfredsen , et al. · 2020

Background: Fish telemetry using electronic transmitter or data storage tags has become a common method for studying free-swimming fish both in the wild and in aquaculture. However, fish used in telemetry studies must be handled, anaesthet…

Heart rate and swimming activity as indicators of post-surgical recovery time of Atlantic salmon (Salmo salar) Open

Martin Føre, Eirik Svendsen, Finn Økland, Albin Gräns, Jo Arve Alfredsen , et al. · 2020

Background: Fish telemetry using electronic transmitter or data storage tags has become a common method for studying free-swimming fish both in the wild and in aquaculture. However, fish used in telemetry studies must be handled, anaesthet…

Salmon louse infestation in wild brown trout populations generates multi-modal mixture distributions Open

Ola H. Diserud, Richard D. Hedger, Bengt Finstad, Ditte K. Hendrichsen, Arne J. Jensen , et al. · 2020

For successful evaluation of the overall effects of salmon louse infestation on brown trout population dynamics, it is crucial to have a realistic understanding of how lice infestation distributions are generated and how they should be int…

Heart rate and swimming activity as stress indicators for Atlantic salmon (Salmo salar) Open

Eirik Svendsen, Martin Føre, Finn Økland, Albin Gräns, Richard D. Hedger , et al. · 2020

We investigated the relationship between telemetry measurements of heart rate and swimming activity and the physiological status in farmed Atlantic salmon (Salmo salar) to assess the potential to use telemetry measurements as proxies for s…

Peer Review #2 of "How caged salmon respond to waves depends on time of day and currents (v0.2)" Open

Richard D. Hedger · 2020

Disease, pest control, and environmental factors such as water quality and carrying capacity limit growth of salmon production in existing farm areas.One way to circumvent such problems is to move production into more exposed locations wit…

Peer Review #2 of "How caged salmon respond to waves depends on time of day and currents (v0.1)" Open

Richard D. Hedger · 2020

Disease, pest control, and environmental factors such as water quality and carrying capacity limit growth of salmon production in existing farm areas.One way to circumvent such problems is to move production into more exposed locations wit…

Heart rate and swimming activity as indicators of post-surgical recovery time of Atlantic salmon (Salmo salar) Open

Martin Føre, Eirik Svendsen, Finn Økland, Albin Gräns, Jo Arve Alfredsen , et al. · 2020

Background: Fish telemetry using electronic transmitter or data storage tags has become a common method for studying free-swimming fish both in the wild and in aquaculture. However, fish used in aquatic telemetry studies must be handled, a…

Migration and habitat use of the landlocked riverine Atlantic salmon Salmo salar småblank Open

Jan Grimsrud Davidsen, Linda Eikås, Richard D. Hedger, Eva B. Thorstad, Lars Rønning , et al. · 2020

“Småblank” is the only population of Atlantic salmon in Europe living its entire life in the river habitat without performing migrations to the sea or lakes. Home range size and habitat use were compared between an unregulated tributary an…

Mapping natural and artificial migration hindrances for fish using LiDAR remote sensing Open

Richard D. Hedger, Stefan Blumentrath, Morten André Bergan, Antti P. Eloranta · 2020

Hedger, R.D., Blumentrath, S., Bergan, M.A. & Eloranta, A.P. 2020. Mapping natural and artificial migration hindrances for fish using LiDAR remote sensing. NINA Report 1833. Norwegian Institute for Nature Research. \nWe developed a new met…

Hotspots for truede arter i Norge: karplanter, insekter og edderkoppdyr, sopp, lav og moser Open

Siri Lie Olsen, Richard D. Hedger, Ditte K. Hendrichsen, Megan Nowell, Benno Dillinger , et al. · 2020

Olsen, S. L., Hedger, R. D., Hendrichsen, D., Nowell, M., Dillinger, B, Syverhuset, A. O., & Evju, M. 2020. Hotspots for truede arter i Norge: karplanter, insekter og edderkoppdyr, sopp, lav og moser. NINA Temahefte 75. Norsk institutt for…

Multi-criteria decision analysis in Bayesian networks - Diagnosing ecosystem service trade-offs in a hydropower regulated river Open

David N. Barton, Håkon Sundt, Ana Adeva Bustos, Hans‐Petter Fjeldstad, Richard D. Hedger , et al. · 2019

The paper demonstrates the use of Bayesian networks in multicriteria decision analysis (MCDA) of environmental design alternatives for environmental flows (eflows) and physical habitat remediation measures in the Mandalselva River in Norwa…

Geografisk utbredelse av truede insekter og edderkoppdyr, sopp, lav og moser: modellering av hotspots Open

Siri Lie Olsen, Richard D. Hedger, Ditte K. Hendrichsen, Benno Dillinger, Alexander Venter , et al. · 2019

The effects of hydrodynamics on the three-dimensional downstream migratory movement of Atlantic salmon Open

Ana Silva, Kim Magnus Bærum, Richard D. Hedger, Henrik Baktoft, Hans‐Petter Fjeldstad , et al. · 2019

Anthropogenic structures in rivers are major threats for fish migration and effective mitigation is imperative given the worldwide expansion of such structures. Fish behaviour is strongly influenced by hydrodynamics, but little is known on…

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