Search Results - "HEDGER, Richard D"

Redefining the oceanic distribution of Atlantic salmon by Rikardsen, Audun H., Righton, David, Strøm, John Fredrik, Thorstad, Eva B., Gargan, Patrick, Sheehan, Timothy, Økland, Finn, Chittenden, Cedar M., Hedger, Richard D., Næsje, Tor F., Renkawitz, Mark, Sturlaugsson, Johannes, Caballero, Pablo, Baktoft, Henrik, Davidsen, Jan G., Halttunen, Elina, Wright, Serena, Finstad, Bengt, Aarestrup, Kim

“…Determining the mechanisms driving range-wide reductions in Atlantic salmon marine survival is hindered by an insufficient understanding of their oceanic…”
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Environmental influence on transmitter detection probability in biotelemetry: developing a general model of acoustic transmission by Gjelland, Karl Ø., Hedger, Richard D., Rands, Sean

“…Summary Environmental factors, such as wind, may have a strong influence on the detection probability and detection rate of acoustic telemetry tags. The effect…”
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Validation of a Swimming Direction Model for the Downstream Migration of Atlantic Salmon Smolts by Szabo-Meszaros, Marcell, Silva, Ana, Bærum, Kim, Baktoft, Henrik, Alfredsen, Knut, Hedger, Richard, Økland, Finn, Gjelland, Karl, Fjeldstad, Hans-Petter, Calles, Olle, Forseth, Torbjørn

“…Fish swimming performance is strongly influenced by flow hydrodynamics, but little is known about the relation between fine-scale fish movements and…”
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The optimized interpolation of fish positions and speeds in an array of fixed acoustic receivers by Hedger, Richard D., Martin, François, Dodson, Julian J., Hatin, Daniel, Caron, François, Whoriskey, Fred G.

“…Hedger, R. D., Martin, F., Dodson, J, J., Hatin, D., Caron, F., and Whoriskey, F. G. 2008. The optimized interpolation of fish positions and speeds in an array…”
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Automated fluvial hydromorphology mapping from airborne remote sensing by Hedger, Richard D., Gosselin, Marie‐Pierre

“…Abstract Mapping fluvial hydromorphology is an important part of defining river habitat. Mapping via field sampling or hydraulic modeling is however time…”
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The effects of hydrodynamics on the three-dimensional downstream migratory movement of Atlantic salmon by Silva, Ana T., Bærum, Kim M., Hedger, Richard D., Baktoft, Henrik, Fjeldstad, Hans-Petter, Gjelland, Karl Ø., Økland, Finn, Forseth, Torbjørn

“…Anthropogenic structures in rivers are major threats for fish migration and effective mitigation is imperative given the worldwide expansion of such…”
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Modelling the downstream longitudinal effects of frequent hydropeaking on the spawning potential and stranding susceptibility of salmonids by Burman, Anton J., Hedger, Richard D., Hellström, J. Gunnar I., Andersson, Anders G., Sundt-Hansen, Line E.

“…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…”
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Modelling the effects of stranding on the Atlantic salmon population in the Dale River, Norway by Sauterleute, Julian F., Hedger, Richard D., Hauer, Christoph, Pulg, Ulrich, Skoglund, Helge, Sundt-Hansen, Line E., Bakken, Tor Haakon, Ugedal, Ola

“…Rapid dewatering in rivers as a consequence of hydropower operations may cause stranding of juvenile fish and have a negative impact on fish populations. We…”
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Exploring sensitivities to hydropeaking in Atlantic salmon parr using individual‐based modelling by Hedger, Richard D., Sundt‐Hansen, Line E., Juárez‐Gómez, Ana, Alfredsen, Knut, Foldvik, Anders

“…Hydropeaking (the release of water pulses at hydropower plants) results in temporary reductions in river channel water‐covered area downstream, which may cause…”
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Hydropower-related mortality and behaviour of Atlantic salmon smolts in the River Sieg, a German tributary to the Rhine by Havn, Torgeir B., Thorstad, Eva B., Teichert, Maxim A. K., Sæther, Stein A., Heermann, Lisa, Hedger, Richard D., Tambets, Meelis, Diserud, Ola H., Borcherding, Jost, Økland, Finn

“…We studied downstream migration of 256 radio-tagged Atlantic salmon smolts passing a low-head power station where technical facilities have been improved to…”
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Movements and dispersal of farmed Atlantic salmon following a simulated-escape event by SOLEM, Øyvind, HEDGER, Richard D, URKE, Henning A, KRISTENSEN, Torstein, ØKLAND, Finn, ULVAN, Eva M, UGLEM, Ingebrigt

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On the parameterization of acoustic detection probability models by Gjelland, Karl Ø., Hedger, Richard D., Reynolds, John

“…Summary Methods that aid in understanding the variation in the detection probability in acoustic telemetry can aid proper interpretations of data derived using…”
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Modelling the effect of hydropeaking‐induced stranding mortality on Atlantic salmon population abundance by Hedger, Richard D., Sauterleute, Julian, Sundt‐Hansen, Line E., Forseth, Torbjørn, Ugedal, Ola, Diserud, Ola H., Bakken, Tor H.

“…Studies of hydropeaking‐induced stranding mortality on fish populations have been confined to analysis of empirical data and/or short‐term hydraulic‐habitat…”
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Migration and habitat use of the landlocked riverine Atlantic salmon Salmo salar småblank by Davidsen, Jan G., Eikås, Linda, Hedger, Richard D., Thorstad, Eva B., Rønning, Lars, Sjursen, Aslak D., Berg, Ole K., Bremset, Gunnbjørn, Karlsson, Sten, Sundt-Hansen, Line E.

“…“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…”
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Sea lice in Iceland: assessing the status and current implications for aquaculture and wild salmonids by Karbowski, Chelsey M., Finstad, Bengt, Karbowski, Niklas, Hedger, Richard D.

“…This is the first in-depth study which quantifies lice infestation levels on wild and farmed salmonids in a fjord system in Iceland (Arnarfjörður, Westfjords)…”
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Behaviour of Atlantic cod, a marine fish predator, during Atlantic salmon post-smolt migration by Hedger, Richard D, Uglem, Ingebrigt, Thorstad, Eva B, Finstad, Bengt, Chittenden, Cedar M, Arechavala-Lopez, Pablo, Jensen, Arne J, Nilsen, Rune, Økland, Finn

“…Hedger, R. D., Uglem, I., Thorstad, E. B., Finstad, B., Chittenden, C. M., Arechavala-Lopez, P., Jensen, A. J., Nilsen, R., and Økland, F. 2011. Behaviour of…”
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Movements and dispersal of farmed Atlantic salmon following a simulated-escape event by Solem, Øyvind, Hedger, Richard D., Urke, Henning A., Kristensen, Torstein, Økland, Finn, Ulvan, Eva M., Uglem, Ingebrigt

“…One of the major challenges for understanding the ecological impact of escaped farmed Atlantic salmon ( Salmo salar L.) is predicting their dispersal patterns…”
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Active migration of wild Atlantic salmon Salmo salar smolt through a coastal embayment by Hedger, RD, Martin, F, Hatin, D, Caron, F, Whoriskey, FG, Dodson, JJ

“…Migration patterns of wild Atlantic salmon Salmo salar smolt were examined in a coastal embayment in the Gaspe peninsula of Quebec, Canada. Twenty-four smolt…”
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Improving abundance estimates from electrofishing removal sampling by Hedger, Richard D., de Eyto, Elvira, Dillane, Mary, Diserud, Ola H., Hindar, Kjetil, McGinnity, Philip, Poole, Russell, Rogan, Ger

“…Estimates of fish abundance from electrofishing surveys depend on accurate estimation of capture probability. We examine in this paper how estimates of capture…”
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Migration and swimming depth of Atlantic salmon kelts Salmo salar in coastal zone and marine habitats by Hedger, RD, Hatin, D, Dodson, JJ, Martin, F, Fournier, D, Caron, F, Whoriskey, FG

“…Factors influencing the migration and swimming depth of Atlantic salmon kelts Salmo salar L. within the York Estuary and Gaspe Bay (Quebec, Canada), and in the…”
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