0000000000971229

AUTHOR

Kjell Harald Nedreaas

showing 2 related works from this author

Fremmede arter i Norge: resultater fra kvantitative økologiske risikovurderinger

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 local biodiversity and ecosystem functioning, and, ultimately, to biotic homogenisation. 2. We risk-assessed all alien plants, animals, fungi and algae, within certain delimitations, that are known to reproduce in Norway. Mainland Norway and the Arctic archipelago of Svalbard plus Jan Mayen were treated as separate assessment areas. Assessments followed the Generic Ecological Impact Assessment of Alien Species (GEIAA) protocol, which uses a fully quantitative set of criteria.…

:Ecology: 488 [VDP]VDP::Matematikk og naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488Invasjonsbiologi / Invasion biologyecological impactinvasion potentialgenetic contaminationInvasive speciesevidence‐based managementinvasive speciesevidence-based managementInvasjonsbiologiGenetic contaminationGE1-350ecological effectAlien speciesQH540-549.5VDP::Mathematics and natural scienses: 400::Zoology and botany: 480::Ecology: 488EcologyImpact assessmentEcologyVDP::Økologi: 488Evidence-based managementVDP::Ecology: 488quantitative impact assessmentPeer reviewEnvironmental sciencesGeographydoor‐knocker speciesdoor-knocker species:Økologi: 488 [VDP]Invasion biology
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Depletion of coastal predatory fish sub-stocks coincided with the largest sea urchin grazing event observed in the NE Atlantic

2020

AbstractIn this contribution, we propose fishery driven predator release as the cause for the largest grazing event ever observed in the NE Atlantic. Based on the evolving appreciation of limits to population connectivity, published and previously unpublished data, we discuss whether overfishing caused a grazer bloom of the sea urchin (Strongylocentrotus droebachiensis) resulting in overgrazing of more than 2000 km2 kelp (Laminaria hyperborea) forest along Norwegian and Russian coasts during the 1970 s. We show that coastal fisheries likely depleted predatory coastal fish stocks through modernization of fishing methods and fleet. These fish were important predators on urchins and the reduct…

Conservation of Natural ResourcesFood ChainCoastal fisheriesGeography Planning and DevelopmentFishingPopulationFisheriesCoastal fishRussiaPredatory fishFisheries managementVDP::Matematikk og Naturvitenskap: 400::Basale biofag: 470Environmental ChemistryAnimalseducationEcosystemeducation.field_of_studyStrongylocentrotus droebachiensisRegime shiftsEcologyOverfishingbiologyFishesSea urchin grazingGeneral Medicinebiology.organism_classificationKelp forestKelp forestFisheryGeographySea UrchinsPerspectiveFisheries management
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