Capelin and herring as key species for the yield of north-east Arctic cod. Results from multispecies model runs

Hamre, Johannes

doi:10.3989/scimar.2003.67s1315

Cited by 42 publications

(43 citation statements)

References 7 publications

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“…Our results are in close agreement with earlier studies demonstrating how survival of capelin larvae is affected by herring predation (3,7,28), how survival through later life stages is affected by harvest (11,23) and cod predation (22,29), and further how maturation age increases with increasing abundance (3). Our study, however, synthesizes these observations into one fairly simple model based on survey data.…”

Section: Discussionsupporting

confidence: 83%

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Competition among fishermen and fish causes the collapse of Barents Sea capelin

Hjermann

Ottersen²,

Stenseth³

2004

Proc. Natl. Acad. Sci. U.S.A.

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The vast majority of the world's fisheries are typically managed within a single-species perspective, ignoring the dynamic feedback mechanisms generated by the ecological web of which they are a part. Here we show that the dynamics of the Barents Sea capelin (Mallotus villosus), the world's largest stock of this species, is strongly influenced by both within-system ecological feedback mechanisms and the impact of harvesting. Both overexploitation and predation by herring (Clupea harengus) can cause the population to collapse, whereas predation by cod (Gadus morhua) is demonstrated a delay in the stock's recovery after a collapse. Such collapses, which have occurred twice in 20 years, affect the entire Barents Sea ecosystem, a region that for ages has provided food for all of Europe.Mallotus villosus ͉ cod ͉ herring ͉ harvesting ͉ ratio dependence

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Section: Discussionsupporting

confidence: 83%

“…Our model demonstrates the overall importance of top-down effects on fish stock. Because cod and herring reproduction is strongly affected by climate (30)(31)(32)(33), the climate has a strong indirect delayed effect on capelin dynamics (15,28).…”

Section: Discussionmentioning

confidence: 99%

Competition among fishermen and fish causes the collapse of Barents Sea capelin

Hjermann

Ottersen²,

Stenseth³

2004

Proc. Natl. Acad. Sci. U.S.A.

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“…Tjelmeland & Bogstad 1998;Hamre 2003;Hjermann et al 2004a,b). Moreover, such analyses can indicate previously unknown intra-or interspecific relationships, with their direction and magnitude.…”

Section: Discussionmentioning

confidence: 99%

“…In addition, several authors have made long-term simulations with multispecies models for the Barents Sea and investigated the yield from the different species given different management strategies (e.g. Hamre 2003). The present analysis differs from these papers by being based on statistical time-series analysis, and by being heavily simplified, focusing on only a few key processes.…”

Section: Discussionmentioning

confidence: 99%

“…We used the latter to avoid heterogeneity before and after 1984. For the same reason, we avoided using (b) The modelling approach The failure of single-species models in the 1980s (Nakken 1998) led to the development of multi-species models (Tjelmeland & Bogstad 1998;Hamre 2003). However, these models are based on the experience from a relatively recent time period from which reliable and (more or less) uniformly sampled survey data exist (for capelin, from 1973; for cod, from 1980).…”

Section: Methodsmentioning

confidence: 99%

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Food web dynamics affect Northeast Arctic cod recruitment

et al. 2006

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Proper management of ecosystems requires an understanding of both the species interactions as well as the effect of climate variation. However, a common problem is that the available time-series are of different lengths. Here, we present a general approach for studying the dynamic structure of such interactions. Specifically, we analyse the recruitment of the world's largest cod stock, the Northeast Arctic cod. Studies based on data starting in the 1970-1980s indicate that this stock is affected by temperature through a variety of pathways. However, the value of such studies is somewhat limited by the fact that they are based on a quite specific ecological and climatic situation. Recently, this stock has consisted of fairly young fish and the spawning stock has consisted of relatively few age groups. In this study, we develop a model for the effect of capelin (the cod's main prey) and herring on cod recruitment since 1973. Based on this model, we analyse data on cod, herring and temperature going back to 1921 and find that food-web effects explain a significant part of the cod recruitment variation back to around 1950.

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System dynamics of the Barents Sea capelin

Yndestad

2002

ICES Journal of Marine Science

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Capelin and herring as key species for the yield of north-east Arctic cod. Results from multispecies model runs

Cited by 42 publications

References 7 publications

Competition among fishermen and fish causes the collapse of Barents Sea capelin

Competition among fishermen and fish causes the collapse of Barents Sea capelin

Food web dynamics affect Northeast Arctic cod recruitment

System dynamics of the Barents Sea capelin

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