Browsing Brage IMR by Author "Aschan, Michaela"
Now showing items 1-20 of 22
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BarEcoRe: Barents Sea Ecosystem resilience under global environmental change
Planque, Benjamin; Certain, Grégoire; Dalpadado, Padmini; Fossheim, Maria; Gjøsæter, Harald; Johannesen, Edda; Jørgensen, Lis Lindal; Michalsen, Kathrine; Skern-Mauritzen, Mette; Aschan, Michaela; Primicerio, Raul; Wiedmann, Magnus (Rapport fra Havforskningen;Nr. 16-2013, Working paper, 2013) -
Catch statistics and life history of shrimp, Pandalus borealis, in the Jan Mayen area
Aschan, Michaela; Nilssen, Einar M.; Ofstad, Lise Helen; Torheim, Sverre (ICES CM Documents;1996/K:11, Working paper, 1996)The Norwegian shrimp (Pandalus borealis) fisheries in the Jan Mayen area in the North East Atlantic started in 1974. The catches reached 2000 tons in 1985. Since 1986 the catches decreased, but lately they have increased ... -
Change in Fish Community Structure in the Barents Sea
Aschan, Michaela; Fossheim, Maria; Greenacre, Michael; Primicerio, Raul (Journal article; Peer reviewed, 2013-04-29)Change in oceanographic conditions causes structural alterations in marine fish communities, but this effect may go undetected as most monitoring programs until recently mainly have focused on oceanography and commercial ... -
Changes in the Barents Sea fish community induced by environmental change and fishery
Aschan, Michaela; Fossheim, Maria; Primicerio, Raul (ICES CM documents;2009/ F:05, Working paper, 2009)A spatio-temporal analysis of Barents Sea survey data from the deeper parts of the Barents Sea shows a sudden change in fish community structure and abundance taking place in the mid 1980s and 1990s. The change in fish ... -
Climate change alters the structure of arctic marine food webs due to poleward shifts of boreal generalists
Kortsch, Susanne; Primicerio, Raul; Fossheim, Maria; Dolgov, Andrey V.; Aschan, Michaela (Journal article; Peer reviewed, 2015-09-07)Climate-driven poleward shifts, leading to changes in species composition and relative abundances, have been recently documented in the Arctic. Among the fastest moving species are boreal generalist fish which are expected ... -
Climate-driven changes in functional biogeography of Arctic marine fish communities
Frainer, André; Primicerio, Raul; Kortsch, Susanne; Aune, Magnus; Dolgov, Andrey V.; Fossheim, Maria; Aschan, Michaela (Peer reviewed; Journal article, 2017) -
Evaluation of the Norwegian shrimp surveys conducted in the Barents Sea and the Svalbard area 1980- 1997
Aschan, Michaela; Sunnanå, Knut (ICES CM Documents;1997/Y:7, Working paper, 1997)Trawl surveys for shrimp (Pandalus borealis) have been conducted annually in the Barents Sea and the Svalbard area since 1980 by Norwegian research institutes. The surveys have been conducted in the period April to ... -
Food-web structure varies along environmental gradients in a high-latitude marine ecosystem
Kortsch, Susanne; Primicerio, Raul; Aschan, Michaela; Lind, Sigrid; Dolgov, Andrey V.; Planque, Benjamin (Journal article; Peer reviewed, 2018)Large‐scale patterns in species diversity and community composition are associated with environmental gradients, but the implications of these patterns for food‐web structure are still unclear. Here, we investigated how ... -
Functional roles and redundancy of demersal Barents Sea fish: Ecological implications of environmental change
Aune, Magnus; Aschan, Michaela; Greenacre, Michael; Dolgov, Andrey V.; Fossheim, Maria; Primicerio, Raul (Journal article; Peer reviewed, 2018)When facing environmental change and intensified anthropogenic impact on marine ecosystems, extensive knowledge of how these systems are functioning is required in order to manage them properly. However, in high-latitude ... -
Increased functional diversity warns of ecological transition in the Arctic
Frainer, André; Primicerio, Raul; Dolgov, Andrey V.; Fossheim, Maria; Johannesen, Edda; Lind, Sigrid; Aschan, Michaela (Peer reviewed; Journal article, 2021)As temperatures rise, motile species start to redistribute to more suitable areas, potentially affecting the persistence of several resident species and altering biodiversity and ecosystem functions. In the Barents Sea, a ... -
Management of shrimp fishery (Pandalus borealis) in the Barents Sea and Spitsbergen area [presentation]
Aschan, Michaela; Bakanev, Sergey; Berenboim, Boris I.; Sunnanå, Knut (IMR/PINRO Joint Report Series;1/2004, Conference object, 2004) -
Management of shrimp fishery (Pandalus borealis) in the Barents Sea and Spitsbergen area [presentation]
Aschan, Michaela; Bakanev, Sergey; Berenboim, Boris I.; Sunnanå, Knut (IMR/PINRO Joint Report Series;1/2004, Conference object, 2004) -
Management of the shrimp fishery (Pandalus borealis) in the Barents Sea and Spitsbergen area
Aschan, Michaela; Bakanev, Sergey; Berenboim, Boris I.; Sunnanå, Knut (IMR/PINRO Joint Report Series, Conference object, 2004) -
Management of the shrimp fishery (Pandalus borealis) in the Barents Sea and Spitsbergen area
Aschan, Michaela; Bakanev, Sergey; Berenboim, Boris I.; Sunnanå, Knut (IMR/PINRO Joint Report Series, Conference object, 2004) -
Recruitment of shrimp (Pandalus borealis) in the Barents Sea related to spawning stock and environment
Aschan, Michaela; Ingvaldsen, Randi (Journal article; Peer reviewed, 2008-10)The shrimp spawn in autumn, and the females carry their eggs as out roe until spring when the larvae hatch. Within a period of 2 months the shrimp larvae settle to the bottom. It has been claimed that the year-class strength ... -
Results of Norwegian and Russian investigations of shrimp (Pandalus borealis) in the Barents Sea and Svalbard area in 1992
Aschan, Michaela; Berenboim, Boris I.; Mukhin, S.; Sunnanå, Knut (ICES CM Documents;1993/K:9, Working paper, 1993)The results of the Russian and Norwegian surveys for shrimp, Pandalus borealis, in the Barents Sea in spring and the Svalbard area in autumn 1992 are presented in this paper. The survey results are presented by nation ... -
The role of marine mammals in the Barents Sea foodweb
Blanchet, Marie-Anne; Primicerio, Raul; Frainer, André; Kortsch, Susanne; Skern-Mauritzen, Mette; Dolgov, Andrey V.; Aschan, Michaela (Peer reviewed; Journal article, 2019)Marine mammals are important players in the Barents Sea ecosystem but their structural role in the foodweb has been little explored. We compare foodweb-related characteristics within and between phylogenetic groups for 19 ... -
Spatial and temporal patterns in recruitment of shrimp Pandalus borealis in the Barents Sea
Aschan, Michaela; Ådlandsvik, Bjørn; Tjelmeland, Sigurd (ICES CM documents, Working paper, 2000)The shrimp spawn in autumn and the eggs are carried as out roe by the females until spring when the larvae hatch. Within a period of 2-3 months the shrimp larvae settle to the bottom. Today’s assessment and forecast of ... -
Spatial variation and structural change of the Barents Sea fish community
Fossheim, Maria; Johannesen, Edda; Primicerio, Raul; Aschan, Michaela (ICES CM documents;2009/ E:21, Working paper, 2009)We document the spatial patterns found in the Barents Sea fish community in relation to environmental parameters, analysing data from the ecosystem surveys covering the Norwegian part of the Barents Sea during 2004-2008 ... -
Teinefiske etter reker i Tanafjorden, Finnmark
Johansen, Robert Andre; Aschan, Michaela (Fisken og havet, Research report, 2004)Det ble i perioden 02.08 - 06.08.04 fisket etter reker med tre typer teiner av ulik utforming. En teine av fabrikatet Ladner folding prawn pot fanget best. Fangstene var generelt små noe som tilskrives tilstedeværelse av ...