Edda Johannesen

The Abrupt and Persistent Decline in Recruitment Success in Northeast Arctic Cod: A Review of Probable Causes

Edda Johannesen, Geir Ottersen, Florian Berg, Bjarte Bogstad et autres

ABSTRACT Most of the previously large cod stocks in the North Atlantic are depleted to very low levels. A notable exception has been the Northeast Arctic cod inhabiting the Barents Sea. This cod stock reached a record high level around 2013, but …

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BESS 2024 2. ed. report-pdf

Gro I. van der Meeren, Dmitry V. Prozorkevich, Elena Eriksen, Stine Karlson et autres

Biogeographic Changes in a High Latitude Marine Fish Community: Short‐Time Reversals in Response to Climate Variation

Kari Elsa Ellingsen, Andrey V. Dolgov, Kenneth T. Frank, Edda Johannesen et autres

ABSTRACT Aim Determine whether changes in fish biogeographic composition and key facets of biodiversity are reversible at short time scales in a high latitude marine ecosystem experiencing ocean warming in the context of a recent short‐term cooling, and an increasing then declining …

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Marine fish community data and short-time reversals

Nigel Yoccoz, Kari Ellingsen, A. V. Dolgov, Edda Johannesen et autres

Survey data from an 18-year time series of demersal fish communities, delineated as Arctic, Arctic-boreal and boreal assemblages, were used to examine temporal changes in i) biogeographic composition across the Barents Sea, ii) taxonomic, functional and phylogenetic (alpha) diversity at sub-regional scale …

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Author response for "Biogeographic changes in a high latitude marine fish community: short-term reversals in response to climate variation"

Kari Elsa Ellingsen, Andrey V. Dolgov, Kenneth T. Frank, Edda Johannesen et autres

Contrasting latitudinal patterns in spawning phenology of three gadoids in the northeast Atlantic

Mathilde Bryn Eikefjord, Edda Johannesen, Yves Reecht, Johanna Fall et autres

Abstract The timing of phytoplankton spring blooms varies geographically, typically with later blooms occurring at higher latitudes. This is expected to lead to a latitudinal gradient in timing of spawning of species that depend on synchronizing spawning with the spring bloom to …

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Author response for "Biogeographic changes in a high latitude marine fish community: short-term reversals in response to climate variation"

Kari Elsa Ellingsen, Andrey V. Dolgov, Kenneth T. Frank, Edda Johannesen et autres

Author response for "Biogeographic changes in a high latitude marine fish community: short-term reversals in response to climate variation"

Kari Elsa Ellingsen, Andrey V. Dolgov, Kenneth T. Frank, Edda Johannesen et autres

The living Barents Sea response to peak-warming and subsequent cooling

Elena Eriksen, Bérengère Husson, Georg Skaret, Randi B. Ingvaldsen et autres

The Arctic warms nearly four times faster than the global average, with maximum warming in the Barents Sea. Concurrently, changes in species distribution in this productive and highly exploited sub-Arctic hotspot has been found. However, studies so far have mostly focused on …

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Comparing the somatic growth and swimming kinematics of Atlantic cod ( Gadus morhua , Linnaeus) and haddock ( Melanogrammus aeglefinus , Linnaeus) larvae

Reidun Marie Bjelland, Caroline M. F. Durif, Howard I. Browman, Anne Berit Skiftesvik et autres

Atlantic cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) are found on both sides of the North Atlantic and often their spawning overlaps in time and space. Yet, haddock has a much more variable recruitment than cod in areas where they are sympatric, …

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Northeast Arctic haddock ( Melanogrammus aeglefinus ) spawning grounds and drift to nursery areas in the Barents Sea

Edda Johannesen, Håvard Guldbrandsen Frøysa, Øystein Langangen, Frode Bendiksen Vikebø

Abstract The Northeast Arctic stock of haddock (Melanogrammus aeglefinus) is the most northerly stock of the species. It is one of the largest haddock stocks but not the most studied. Similar to the more extensively studied sympatric cod (Gadus morhua) and herring …

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Incorporation of observation uncertainty in stock assessment using spatio-temporal modeling of catch-at-length and age-at-length survey data

Olav Nikolai Breivik, Fabian Zimmermann, Edda Johannesen, Kotaro Ono et autres

Abstract Spatio-temporal models are essential tools for estimating abundance indices and quantifying the associated uncertainty. Time series of index uncertainties can be used to objectively determine the influence each index has on the assessment. This can involve reducing the influence of indices …

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