Browsing Brage IMR by Author "Espeland, Sigurd Heiberg"
Now showing items 1-20 of 52
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Aktiv forvaltning av marine ressurser - Frøya og Hitra - Arbeidsrapport 2017-2018
Kleiven, Alf Ring; Espeland, Sigurd Heiberg; Albretsen, Jon; Halvorsen, Kim Aleksander Tallaksen; Søvik, Guldborg; Grefsrud, Ellen Sofie; Ottesen, Dag (Rapport fra havforskningen;2019 - 14, Research report, 2019)Prosjektet ‘Aktiv forvaltning av marine ressurser- Frøya og Hitra’ ble formelt startet opp høsten 2017. Den overordnete målsetting med prosjektet er å etablere en solid kunnskapsplattform for å sikre de marine verdiene og ... -
Aktiv forvaltning av marine ressurser - Frøya og Hitra - Sluttrapport
Kleiven, Alf Ring; Espeland, Sigurd Heiberg; Søvik, Guldborg; Albretsen, Jon; Kleiven, Portia Joy Nillos; Zimmermann, Fabian; Grefsrud, Ellen Sofie; Halvorsen, Kim Aleksander Tallaksen; Vie, Ola (Rapport fra havforskningen;2021 - 14, Research report, 2021)Prosjektet ‘Aktiv forvaltning av marine ressurser- Frøya og Hitra’ ble formelt startet opp høsten 2017. Den overordnete målsetningen med prosjektet er å etablere en solid kunnskapsplattform for å sikre de marine verdiene ... -
Aktiv forvaltning av marine ressurser – lokalt tilpasset forvaltning
Espeland, Sigurd Heiberg; Kleiven, Alf Ring; Moland, Even; Knutsen, Jan Atle (Rapport fra Havforskningen;Nr. 34-2014, Working paper, 2014-12) -
Aktiv forvaltning av marine ressurser – lokalt tilpasset forvaltning. Årsrapport 2013
Espeland, Sigurd Heiberg; Kleiven, Alf Ring; Bodvin, Torjan (Rapport fra Havforskningen;Nr. 35-2013, Working paper, 2013-12) -
Aktiv forvaltning av marine ressurser – lokalt tilpasset forvaltning. Årsrapport 2015
Espeland, Sigurd Heiberg; Kleiven, Alf Ring; Moland, Even; Knutsen, Jan Atle (Rapport fra Havforskningen;21-2015, Working paper, 2015) -
Aktiv forvaltning av marine ressurser – lokalt tilpasset forvaltning: LINDESNES - Effekter på hummer i Klippeskjær bevaringsområde
Espeland, Sigurd Heiberg; Kleiven, Alf Ring; Sannæs, Hanne; Kleiven, Portia Joy Nillos (Rapport fra havforskningen;2019 - 12, Research report, 2019)Havforskningsinstituttet har siden 2011 gjennomført prøvefiske etter hummer i Klippeskjær bevaringsområde for å undersøke effekter av hummerfredningen som ble innført i 2013. I perioden frem til 2015 har fangsten av hummer ... -
Aktiv forvaltning av marine verdier i kystsonen
Bodvin, Torjan; Olsen, Torstein; Espeland, Sigurd Heiberg; Kleiven, Alf Ring (Research report, 2010-12) -
Aktiv forvaltning av marine verdier i kystsonen
Bodvin, Torjan; Kleiven, Alf Ring; Espeland, Sigurd Heiberg; Steen, Henning; Moy, Frithjof E. (Årsrapport;2012, Research report, 2012-12-14)The report gives an overview of activities, methods and preliminary results for the two municipalities involved, Tvedestrand and Lindesnes. The Ministry for Fisheries and Coastal affairs proclaimed 20.06.2012 the establishment ... -
Are low but statistically significant levels of genetic differentiation in marine fishes ‘biologically meaningful’? A case study of coastal Atlantic cod
Knutsen, Halvor; Olsen, Esben Moland; Jorde, Per Erik; Espeland, Sigurd Heiberg; André, Carl (Journal article; Peer reviewed, 2010-12-29)A key question in many genetic studies on marine organisms is how to interpret a low but statistically significant level of genetic differentiation. Do such observations reflect a real phenomenon, or are they caused by ... -
Are low but statistically significant levels of genetic differentiation in marine fishes ‘biologically meaningful’? A case study of coastal Atlantic cod
Knutsen, Halvor; Olsen, Esben Moland; Jorde, Per Erik; Espeland, Sigurd Heiberg; André, Carl (Journal article; Peer reviewed, 2010-12-29)A key question in many genetic studies on marine organisms is how to interpret a low but statistically significant level of genetic differentiation. Do such observations reflect a real phenomenon, or are they caused by ... -
Biologiske verdier i sjø : marin kartlegging av kystnære fiskeressurser, vegetasjonsforhold og naturtyper i Vest-Agder fylke
Bodvin, Torjan; Olsen, Torstein; Espeland, Sigurd Heiberg; Steen, Henning (Research report, 2010-12) -
Can we rely on selected genetic markers for population identification? Evidence from coastal Atlantic cod
Jorde, Per Erik; Synnes, Ann-Elin; Espeland, Sigurd Heiberg; Sodeland, Marte; Knutsen, Halvor (Journal article; Peer reviewed, 2018)The use of genetic markers under putative selection in population studies carries the potential for erroneous identification of populations and misassignment of individuals to population of origin. Selected markers are ... -
Combining population genomics with demographic analyses highlights habitat patchiness and larval dispersal as determinants of connectivity in coastal fish species
Knutsen, Halvor; de Oliveira Catarino, Diana Sofia; Rogers, Lauren; Sodeland, Marte; Mattingsdal, Morten; jahnke, marlene; Hutchings, Jeffrey; Mellerud, Ida Kristin; Espeland, Sigurd Heiberg; Johanneson, Kerstin; Roth, Olivia; Hansen, Michael Møller; Jentoft, Sissel; Andre, Carl; Jorde, Per Erik (Peer reviewed; Journal article, 2022)Gene flow shapes spatial genetic structure and the potential for local adaptation. Among marine animals with nonmigratory adults, the presence or absence of a pelagic larval stage is thought to be a key determinant in ... -
Combining population genomics with demographic analyses highlights habitat patchiness and larval dispersal as determinants of connectivity in coastal fish species
Knutsen, Halvor; de Oliveira Catarino, Diana Sofia; Rogers, Lauren; Sodeland, Marte; Mattingsdal, Morten; jahnke, marlene; Hutchings, Jeffrey; Mellerud, Ida Kristin; Espeland, Sigurd Heiberg; Johanneson, Kerstin; Roth, Olivia; Hansen, Michael Møller; Jentoft, Sissel; Andre, Carl; Jorde, Per Erik (Peer reviewed; Journal article, 2022)Gene flow shapes spatial genetic structure and the potential for local adaptation. Among marine animals with nonmigratory adults, the presence or absence of a pelagic larval stage is thought to be a key determinant in ... -
Diel vertical migration patterns in juvenile cod from the Skagerrak coast
Espeland, Sigurd Heiberg; Thoresen, Adine Guldborg; Olsen, Esben Moland; Stige, Leif Christian; Knutsen, Halvor; Gjøsæter, Jakob; Stenseth, Nils Christian (Journal article; Peer reviewed, 2010-04-29)We demonstrated a clear year-round diel vertical migration pattern (DVM) of small (26 to 45 cm) Skagerrak coastal cod Gadus morhua on a small geographic scale. Generalized additive models (GAMs) were used to make inferences ... -
Egg distribution, bottom topography and small-scale cod population structure in a coastal marine system
Knutsen, Halvor; Olsen, Esben Moland; Ciannelli, Lorenzo; Espeland, Sigurd Heiberg; Knutsen, Jan Atle; Simonsen, Jan Henrik; Skreslet, Stig; Stenseth, Nils Christian (Journal article; Peer reviewed, 2007-03-12)Coastal marine species with pelagic egg and larval stages, such as the Atlantic cod Gadus morhua, can be structured into genetically distinct local populations on a surprisingly small geographic scale considering their ... -
Estimating cod egg developmental stage based on DNA concentration
Espeland, Sigurd Heiberg; Sannæs, Hanne (Journal article; Peer reviewed, 2017)Pelagic egg surveys are commonly used to map Atlantic cod spawning areas in the northeastern Atlantic. However, a sampling location may not necessarily indicate a spawning location, because more developed eggs may have ... -
Evaluering av effekten av forvaltningstiltak på hummer og forslag til tiltak
Kleiven, Alf Ring; Moland, Even; Sørdalen, Tonje Knutsen; Espeland, Sigurd Heiberg; van der Meeren, Gro Ingleid (Rapport fra havforskningen;Nr. 15 - 2017, Research report, 2017) -
Evaluering av tiltak for vern av kysttorsk i sør innført juni 2019
Knutsen, Halvor; Espeland, Sigurd Heiberg; Moland, Even (Rapport fra havforskningen;2022 - 48, Research report, 2022)Vi ser i våre data ingen tegn til at bestandssituasjonen for torsk er endret i indre Skagerrak, ytre- og indre Oslofjord siden tiltak ble innført i 2019. Havforskningsinstituttets data viser stabilt lave fangster av torsk ... -
Fishing pressure impacts the abundance gradient of European lobsters across the borders of a newly established marine protected area
Kleiven, Portia Joy Nillos; Espeland, Sigurd Heiberg; Olsen, Esben Moland; Abesamis, Rene A.; Moland, Even; Kleiven, Alf Ring (Journal article; Peer reviewed, 2019)Marine protected areas (MPAs) are considered viable fisheries management tools due to their potential benefits of adult spillover and recruitment subsidy to nearby fisheries. However, before–after control–impact studies ...