Browsing Brage by Author "Johnsen, Stein Ivar"
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Alien species in Norway: results from quantitative ecological impact assessments
Sandvik, Hanno; Hilmo, Olga; Henriksen, Snorre; Elven, Reidar; Åsen, Per Arvid; Hegre, Hanne; Pedersen, Oddvar; Pedersen, Per Anker; Solstad, Heidi; Vandvik, Vigdis; Westergaard, Kristine Bakke; Ødegaard, Frode; Åström, Sandra Charlotte Helene; Elven, Hallvard; Endrestøl, Anders; Gammelmo, Øivind; Hatteland, Bjørn Arild; Solheim, Halvor; Nordén, Björn; Sundheim, Leif; Talgø, Venche; Falkenhaug, Tone; Gulliksen, Bjørn; Jelmert, Anders; Oug, Eivind; Sundet, Jan Henry; Forsgren, Elisabet; Finstad, Anders Gravbrøt; Hesthagen, Trygve H.; Nedreaas, Kjell Harald; Wienerroither, Rupert; Husa, Vivian; Fredriksen, Stein; Sjøtun, Kjersti; Steen, Henning; Hansen, Haakon; Hamnes, Inger Sofie; Karlsbakk, Egil; Magnusson, Christer; Ytrehus, Bjørnar; Pedersen, Hans Christian; Swenson, Jon; Syvertsen, Per Ole; Stokke, Bård Gunnar; Gjershaug, Jan Ove; Dolmen, Dag; Kjærstad, Gaute; Johnsen, Stein Ivar; Jensen, Thomas Correll; Hassel, Kristian; Gederaas, Lisbeth (Journal article, 2020)1. Due to globalisation, trade and transport, the spread of alien species is increasing dramatically. Some alien species become ecologically harmful by threatening native biota. This can lead to irreversible changes in ... -
Alien species in Norway: results from quantitative ecological impact assessments
Sandvik, Hanno; Hilmo, Olga; Henriksen, Snorre; Elven, Reidar; Åsen, Per Arvid; Hegre, Hanne; Pedersen, Oddvar; Pedersen, Per Anker; Solstad, Heidi; Vandvik, Vigdis; Westergaard, Kristine Bakke; Ødegaard, Frode; Åström, Sandra Charlotte Helene; Elven, Hallvard; Endrestøl, Anders; Gammelmo, Øivind; Hatteland, Bjørn Arild; Solheim, Halvor; Nordén, Björn; Sundheim, Leif; Talgø, Venche; Falkenhaug, Tone; Gulliksen, Bjørn; Jelmert, Anders; Oug, Eivind; Sundet, Jan Henry; Forsgren, Elisabet; Finstad, Anders Gravbrøt; Hesthagen, Trygve H.; Nedreaas, Kjell Harald; Wienerroither, Rupert; Husa, Vivian; Fredriksen, Stein; Sjøtun, Kjersti; Steen, Henning; Hansen, Haakon; Hamnes, Inger Sofie; Karlsbakk, Egil; Magnusson, Christer; Ytrehus, Bjørnar; Pedersen, Hans Christian; Swenson, Jon; Syvertsen, Per Ole; Stokke, Bård Gunnar; Gjershaug, Jan Ove; Dolmen, Dag; Kjærstad, Gaute; Johnsen, Stein Ivar; Jensen, Thomas Correll; Hassel, Kristian; Gederaas, Lisbeth (Peer reviewed; Journal article, 2020)1. Due to globalisation, trade and transport, the spread of alien species is increasing dramatically. Some alien species become ecologically harmful by threatening native biota. This can lead to irreversible changes in ... -
Assessment of the risk to Norwegian biodiversity from import and keeping of crustaceans in freshwater aquaria. Scientific Opinion of the Panel on Alien Organisms and trade in Endangered Species (CITES) of the Norwegian Scientific Committee for Food and Environment
Velle, Gaute; Edsman, Lennart; Evangelista, Charlotte; Johnsen, Stein Ivar; Malmstrøm, Martin; Vrålstad, Trude; de Boer, Hugo; Eldegard, Katrine; Hindar, Kjetil; Hole, Lars Robert; Järnegren, Johanna; Kausrud, Kyrre Linné; Måren, Inger Elisabeth; Nilsen, Erlend Birkeland; Rueness, Eli Knispel; Thorstad, Eva Bonsak; Nielsen, Anders (Peer reviewed; Journal article, 2021)Key words: Risk assessment, Crayfish, Shrimps, Crabs, Climate change, Aphanomyces astaci, White spot syndrome, Alien species, Biological invasion Introduction The Norwegian Scientific Committee for Food and Environment ... -
Assessment of the risk to Norwegian biodiversity from import and keeping of crustaceans in freshwater aquaria. Scientific Opinion of the Panel on Alien Organisms and Trade in Endangered Species of the Norwegian Scientific Committee for Food and Environment
Velle, Gaute; Edsman, Lennart; Evangelista, Charlotte; Johnsen, Stein Ivar; Malmstrøm, Martin; Vrålstad, Trude; de Boer, Hugo; Eldegard, Katrine; Hindar, Kjetil; Hole, Lars Robert; Kausrud, Kyrre Linné; Järnegren, Johanna; Måren, Inger Elisabeth; Nilsen, Erlend Birkeland; Rueness, Eli Knispel; Thorstad, Eva Bonsak; Nielsen, Anders (Peer reviewed; Journal article, 2021) -
Environmental DNA (eDNA) Monitoring of Noble Crayfish Astacus astacus in Lentic Environments Offers Reliable Presence-Absence Surveillance – But Fails to Predict Population Density
Johnsen, Stein Ivar; Strand, David; Rusch, Johannes; Vrålstad, Trude (Peer reviewed; Journal article, 2020)Noble crayfish is the most widespread native freshwater crayfish species in Europe. It is threatened in its entire distribution range and listed on the International Union for Concervation Nature- and national red lists. ... -
Exploring the eDNA dynamics of the host-pathogen pair Pacifastacus leniusculus (Decapoda) and Aphanomyces astaci (Saprolegniales) under experimental conditions
Rusch, Johannes; Strand, David; Laurendz, Charlotte; Andersen, Tom; Johnsen, Stein Ivar; Edsman, Lennart; Vrålstad, Trude (Peer reviewed; Journal article, 2022)The oomycete Aphanomyces astaci causes crayfish plague, a disease threatening native European crayfish. It is carried and transmitted by American crayfish species, which are the original hosts of A. astaci. In recent years, ... -
Exploring the eDNA dynamics of the host-pathogen pair Pacifastacus leniusculus (Decapoda) and Aphanomyces astaci (Saprolegniales) under experimental conditions
Rusch, Johannes; Strand, David; Laurendz, Charlotte; Andersen, Tom; Johnsen, Stein Ivar; Edsman, Lennart; Vrålstad, Trude (Peer reviewed; Journal article, 2022)The oomycete Aphanomyces astaci causes crayfish plague, a disease threatening native European crayfish. It is carried and transmitted by American crayfish species, which are the original hosts of A. astaci. In recent years, ... -
Miljø-DNA: uttesting av innsamlingsmetodikk og labanalyser for påvisning av kreps og fisk i ferskvann
Fossøy, Frode; Strand, David; Sandercock, Brett; Johnsen, Stein Ivar (NINA rapport, Research report, 2020)Miljø-DNA er en relativ ny metode for overvåking av arter og økosystemer som brukes i økende omfang. Fra en vannprøve er det mulig å gi et øyeblikksbilde av hvilke makro- og mikroorganismer som er tilstede i vannet, uten ... -
Monitoring a Norwegian freshwater crayfish tragedy: eDNA snapshots of invasion, infection and extinction
Strand, David A; Johnsen, Stein Ivar; Rusch, Johannes C; Agersnap, Sune; Larsen, William Brenner; Knudsen, Steen Wilhelm; Møller, Peter Rask; Vrålstad, Trude (Peer reviewed; Journal article, 2019)1. The European noble crayfish Astacus astacus is threatened by crayfish plague caused by the oomycete Aphanomyces astaci, which is spread by the invasive North American crayfish (e.g. signal crayfish Pacifastacus leniusculus). ... -
Nasjonal overvåking av edelkreps og spredning av signalkreps - presentasjon av overvåkingsdata og bestandsstatus – oppdatert 2019
Johnsen, Stein Ivar; Strand, David; Rusch, Johannes; Vrålstad, Trude (NINA rapport, Research report, 2019)Overvåkingsprogrammet for edelkreps ble startet opp i 2001. Programmets overordnede mål er å overvåke tilstanden til et utvalg av de viktigste norske edelkrepsbestandene slik at større endringer i bestandsstatus kan avdekkes. ... -
Nasjonal overvåking av edelkreps og spredning av signalkreps - presentasjon av overvåkingsdata og bestandsstatus – oppdatert 2020
Johnsen, Stein Ivar; Strand, David; Rusch, Johannes; Vrålstad, Trude (NINA rapport, Research report, 2021)Overvåkingsprogrammet for edelkreps ble startet opp i 2001. Programmets overordnede mål er å overvåke tilstanden til et utvalg av de viktigste norske edelkrepsbestandene slik at større endringer i bestandsstatus kan avdekkes. ... -
Nasjonal overvåking av edelkreps og spredning av signalkreps. Presentasjon av overvåkingsdata og bestandsstatus
Johnsen, Stein Ivar; Strand, David; Rusch, Johannes; Vrålstad, Trude (NINA rapport, Research report, 2019)Overvåkingsprogrammet for edelkreps ble startet opp i 2001. Programmets overordnede mål er å overvåke tilstanden til et utvalg av de viktigste norske edelkrepsbestandene slik at større endringer i bestandsstatus kan avdekkes. ... -
The surveillance programme for Aphanomyces astaci in Norway 2016
Vrålstad, Trude; Strand, David; Rusch, Johannes; Toverud, Øystein; Johnsen, Stein Ivar; Tarpai, Attila; Møller, Peter Rask; Gjevre, Anne Gerd (Research report, 2017)In this surveillance program, we used two methodological approaches. One is based on the traditional cage experiments, the other relies on eDNA monitoring of the water, where DNA from spores of A. astaci are detected ... -
The surveillance programme for Aphanomyces astaci in Norway 2017
Vrålstad, Trude; Rusch, Johannes; Johnsen, Stein Ivar; Tarpai, Attila; Strand, David (Research report, 2018)In this surveillance program, we used environmental DNA (eDNA) monitoring of the water as an alternative method to the traditional cage experiments with live noble crayfish. Here, DNA from spores of Aphanomyces astaci are ... -
The surveillance programme for Aphanomyces astaci in Norway 2018
Strand, David; Rusch, Johannes; Johnsen, Stein Ivar; Tarpai, Attila; Vrålstad, Trude (Research report, 2019)In this surveillance program, environmental DNA (eDNA) monitoring of the water was used as an alternative method to the traditional cage experiments with live noble crayfish. Here, DNA from spores of Aphanomyces astaci are ... -
The surveillance programme for Aphanomyces astaci in Norway 2019
Strand, David; Rusch, Johannes; Johnsen, Stein Ivar; Tarpai, Attila; Vrålstad, Trude (Research report, 2020) -
The surveillance programme for Aphanomyces astaci in Norway 2020
Strand, David; Johnsen, Stein Ivar; Rusch, Johannes; Vrålstad, Trude (Veterinærinstituttets rapportserie, Research report, 2021)In this surveillance programme, environmental DNA (eDNA) monitoring is used for the detection of species specific DNA from spores of Aphanomyces astaci directly from water filtrates. The presence/absence of eDNA from noble ... -
The surveillance programme for Aphanomyces astaci in Norway 2021
Strand, David; Johnsen, Stein Ivar; Rusch, Johannes; Amundsen, Marit Måsøy; Mohammad, Saima; Welde, Hilde Irene; Vrålstad, Trude (Veterinærinstituttets rapportserie, Research report, 2022) -
The surveillance programme for Aphanomyces astaci in Norway 2022 and evaluation of disease freedom in Buåa watercourse
Strand, David; Johnsen, Stein Ivar; Amundsen, Marit Måsøy; Mohammad, Saima; Vrålstad, Trude (Research report, 2023) -
The surveillance programme for Aphanomyces astaci in Norway 2023
Strand, David; Johnsen, Stein Ivar; Mohammad, Saima; Amundsen, Marit Måsøy; Benedicenti, Ottavia; Vrålstad, Trude (Research report, 2024)