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Jón Sólmundsson

Jón Sólmundsson
Marine and Freshwater Research Institute, Iceland · Demersal Division

MSc

About

60
Publications
10,250
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854
Citations
Additional affiliations
June 2016 - present
Marine and Freshwater Research Institute, Iceland
Position
  • Researcher

Publications

Publications (60)
Article
Natural mortality (M) is difficult to measure directly in exploited fish stocks. Therefore, in stock assessments, M has usually been assumed to be constant for age classes of fishable size. However, M is likely to vary annually due to temporal changes in food availability, predation, fish size at age, and other biological and environmental factors....
Technical Report
Full-text available
The report describes the implementation and main results of the Icelandic Groundfish Survey, carried out during 28 February to 24 March 2022. This standardized survey has been conducted annually since 1985 and the present results are compared with those of previous years.
Method
Full-text available
Handbók þessi lýsir framkvæmd rannsóknaverkefnisins „Stofnmæling botnfiska á Íslandsmiðum“ (SMB) sem fer fram í marsmánuði á hverju ári. Í handbókinni er nákvæmlega lýst fyrirhugaðri framkvæmd verkefnisins í mars 2022, m.a. umfangi gagnasöfnunar, hvernig safna eigi líffræðilegum upplýsingum, skráningu mælinga, veiðarfæri og veiðiaðferðum. Einnig er...
Article
Full-text available
ÁRIÐ 2017 veiddist brislingur (Sprattus sprattus) í fyrsta sinn á Íslandsmiðum svo vitað sé. Á næstu árum fjölgaði brislingum sem veiddust við landið og í rannsóknarleiðangri í mars 2021 fengust alls 375 brislingar, einkum fyrir Suður- og Vesturlandi. Í leiðöngrum haustið 2021 fengust um 300 brislingar, nokkrir við Suðurland og í Faxaflóa en flesti...
Article
Full-text available
Otolith shape has previously been used to identify ecotypes within the Icelandic cod ( Gadus morhua) stock, using DST profiles to validate the results. Fish otolith shape variation has repeatedly been found to be largely determined by growth rate. To examine the effect of growth rate on the relationship between otolith shape and cod ecotypes (using...
Article
Full-text available
Migration and behaviour of Icelandic cod Tagging studies have been used to study migration of Icelandic cod since 1904. Results from data storage tags (DSTs) have revealed two different behaviour patterns, coastal cod that mainly inhabits coastal waters shallower than 200 m and frontal cod migrating to offshore frontal areas during the feeding peri...
Technical Report
Full-text available
Farið er yfir framkvæmd og helstu niðurstöður stofnmælingar hrygningarþorsks með þorskanetum (SMN, netarall) sem fór fram í 26. sinn dagana 25. mars til 27. apríl 2021. This report describes the implementation and main results of the gillnet survey of spawning cod in Icelandic waters (SMN) carried out for the 26th time between 25 March and 27 Apri...
Technical Report
Full-text available
Gerð er grein fyrir framkvæmd og helstu niðurstöðum stofnmælingar botnfiska á Íslandsmiðum sem fram fór dagana 1.‐23. mars 2021. Niðurstöður eru bornar saman við fyrri ár, en verkefnið hefur verið framkvæmt með sambærilegum hætti ár hvert frá 1985. The report describes the implementation and main results of the Icelandic Groundfish Survey, carrie...
Preprint
Full-text available
Otolith shape has previously been used to identify ecotypes within the Icelandic cod (Gadus morhua) stock, using DST profiles to validate the results. Fish otolith shape variation has repeatedly been found to be largely determined by growth rate. To examine the effect of growth rate on the relationship between otolith shape and cod ecotypes (using...
Technical Report
Full-text available
This report describes the implementation and main results of the Icelandic autumn groundfish survey, carried out between 9 October and 2 November 2020. This standardized survey has been conducted annually since 1996 and the present results are compared with those of previous years.
Article
Full-text available
Marine biota are redistributing at a rapid pace in response to climate change and shifting seascapes. While changes in fish populations and community structure threaten the sustainability of fisheries, our capacity to adapt by tracking and projecting marine species remains a challenge due to data discontinuities in biological observations, lack of...
Article
Full-text available
Marine biota are redistributing at a rapid pace in response to climate change and shifting seascapes. While changes in fish populations and community structure threaten the sustainability of fisheries, our capacity to adapt by tracking and projecting marine species remains a challenge due to data discontinuities in biological observations, lack of...
Article
Full-text available
The distributional response of marine fishes to climate warming would be expected to be very different than that of homeothermic birds and mammals, due both to more direct thermal effects on poikilothermic fish physiology and on reduced habitat fragmentation. In this study, we use a combination of linear models and graphical tools to quantify three...
Preprint
Full-text available
Marine biota is redistributing at a rapid pace in response to climate change and shifting seascapes. While changes in fish populations and community structure threaten the sustainability of fisheries, our capacity to adapt by tracking and projecting marine species remains a challenge due to data discontinuities in biological observations, lack of d...
Technical Report
Full-text available
The report describes the implementation and main results of the Icelandic Groundfish Survey, carried out between 27 February and 20 March 2020. This standardized survey has been conducted annually since 1985 and the present results are compared with those of previous years.
Method
Full-text available
Handbók um stofnmælingu botnfiska á Íslandsmiðum sem hófst 27. febrúar 2020. Lýst er framkvæmd verkefnisins, m.a. umfangi gagnasöfnunar, hvernig safna eigi líffræðilegum upplýsingum, skráningu mælinga, veiðarfæri og veiðiaðferðum. Einnig eru fyrirmæli um það hvernig aðferðum skuli beitt við tog og gefnar nákvæmar staðsetningar og aðrar upplýsingar...
Article
Full-text available
Previous analyses of marine fish species richness based on presence‐absence data have shown changes with latitude and average species size, but little is known about the underlying processes. To elucidate these processes we use metabolic, neutral and descriptive statistical models to analyse how richness responds to maximum species length, fish abu...
Technical Report
Full-text available
Gerð er grein fyrir helstu niðurstöðum Stofnmælingar botnfiska að haustlagi sem fram fór dagana 26. september til 3. nóvember 2019. Niðurstöður eru bornar saman við fyrri ár, en verkefnið hefur verið framkvæmt með sambærilegum hætti frá 1996.
Technical Report
Full-text available
Nýliðun er lykilþáttur varðandi viðgang fiskistofa. Upplýsingar um nýliðun eru mikilvægar í stofnmati enda segja þær til um fjölda einstaklinga sem bætast munu við stofna og veiðar á komandi árum. Hrygningarstofn þorsks við Ísland hefur farið stækkandi á síðustu árum en á sama tíma hafa fáir sterkir árgangar þorsks komið inn í stofninn. Í þessari s...
Article
Full-text available
A fundamental challenge in ecology is to understand why species are found where they are and predict where they are likely to occur in the future. Trait-based approaches may provide such understanding, because it is the traits and adaptations of species that determine which environments they can inhabit. It is therefore important to identify key tr...
Poster
Full-text available
Tvö af tegundaríkustu fiskasamfélögum í hafinu umhverfis Ísland má finna á miklu dýpi í landgrunnshallanum fyrir vestan og suðaustan landið. • Dökkháfur (Etmopterus princeps) og svartháfur (Centroscyllium fabricii) og eru djúpsjávartegundir af dökkháfaaett (Etmopteridae) sem tilheyra þessum samfélögum og eru þeir algengir í haustralli Hafrannsóknas...
Technical Report
Full-text available
Farið er yfir framkvæmd og helstu niðurstöður stofnmælingar hrygningarþorsks með þorskanetum (netarall) sem fór fram í 24. sinn dagana 25. mars til 29. apríl 2019.
Technical Report
Full-text available
Gerð er grein fyrir framkvæmd og helstu niðurstöðum stofnmælingar botnfiska á Íslandsmiðum sem fram fór dagana 26. febrúar til 20. mars 2019. Niðurstöður eru bornar saman við fyrri ár, en verkefnið hefur verið framkvæmt með sambærilegum hætti ár hvert frá 1985.
Article
Homing and site fidelity of Atlantic wolffish Anarhichas lupus was studied at the main spawning ground and four different feeding grounds in Icelandic waters. A total of 883 fish were tagged with T-bar anchor tags, whereof 349 fish also received an internally implanted data storage tag (DST). The DSTs data revealed consistent year-to-year migration...
Article
Full-text available
Knowing movement and structure of fish populations is a prerequisite for effective spatial fisheries management. The study evaluates migration patterns and connectivity of two groups of cod (Gadus morhua) associated with offshore feeding and nursery grounds. This was achieved by investigating (i) migration pathways of cod tagged at the feeding area...
Conference Paper
One of the major goals in biogeography is describing and understanding species distributions. However, when focusing on taxonomy one may miss the mechanistic understanding of what underlies these distributions. Trait-based ecologists argue that traits are useful in explaining where species occur, since it is the traits that determine how species re...
Article
Changes in stock size of a top predator have been found to cascade through the trophic levels but the mechanism has not been fully clarified. Using data from annual trawl surveys within a fjord during 1988-2015, we present evidence that changes in abundance of cod Gadus morhua and haddock Melanogrammus aeglefinus have an immediate effect on the dis...
Technical Report
Full-text available
The report presents methods and results of an annual flatfish survey in the bay of Faxaflói, SW Iceland, in 1995-2013. The main objective of the project was to study size composition, age, abundance and distribution of plaice (Pleuronectes platessa) and dab (Limanda limanda) in the bay, before the initiation of the seasonal demersal seine fishery....
Article
The life history of a species is determined by trade-offs between growth, survival and reproduction to maximize fitness in a given environment. Following a theoretical model, we investigate whether the composition of marine fish communities can be understood in terms of a set of life-history strategies and whether the prevalence of the strategies f...
Technical Report
Full-text available
https://www.hafogvatn.is/static/research/files/fjolrit-182pdf
Article
Full-text available
The study analyses the home ranges and spatial segregation of spawning components of Icelandic cod Gadus morhua based on: (1) conventional tag (CT) recaptures and (2) depth, temperature and tidal locations from electronic data storage tags (DSTs). A total of 5987 CT recapture positions from tagging in geographically distinct spawning grounds from 1...
Technical Report
Full-text available
https://www.hafogvatn.is/static/research/files/fjolrit-176pdf
Article
Full-text available
In recent years, about one-third of the cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) catches in Icelandic waters have been obtained with longline. Although longlining has been regarded as a conservation-oriented fishing method, a serious drawback of this fishing gear is the high catches of undersized fish. Our purpose was to locate are...
Poster
Full-text available
Most species living in the warmer waters showed an upward trend in abundance following warming in 1996 and a clockwise distributional shift along the shelf. For many of these species, however, this response was not immediate but became evident in the warm years that followed. For the last 4-6 years there has been a significant influx of previously...
Article
Full-text available
The interaction between two species of gadoid and a shrimp stock was studied in a 40 km long two-armed fjord in north-west Iceland. On the basis of acoustic and trawl surveys in 2005 and 2006, immature cod Gadus morhua and haddock Melanogrammus aeglefinus were found to migrate to the inner part of the fjord in late summer, concurrent with rising te...
Article
Full-text available
Björnsson, B., Karlsson, H., Thorsteinsson, V., and Solmundsson, J. 2011. Should all fish in mark–recapture experiments be double-tagged? Lessons learned from tagging coastal cod (Gadus morhua). – ICES Journal of Marine Science, 68: . Cod (Gadus morhua) were tagged outside and inside “herds” formed by anthropogenic feeding in an Icelandic fjord. Re...
Article
Full-text available
The abundance and distribution of monkfish (Lophius piscatorius) at Iceland have increased rapidly in the last decade, concurrent with rising seawater temperatures and salinity. These environmental changes seem to have improved the reproductive success of the monkfish stock, and since 1998 large cohorts have recruited almost annually, in great cont...
Article
Full-text available
Schopka, S. A., Solmundsson, J., Ragnarsson, S. A., and Thorsteinsson, V. 2010. Using tagging experiments to evaluate the potential of closed areas in protecting migratory Atlantic cod (Gadus morhua). – ICES Journal of Marine Science, 67: 1024–1035. About 5200 cod (Gadus morhua) were tagged on three fishing grounds and within two marine protected a...
Article
Full-text available
The density and mean size of demersal fish were analysed inside and outside three protected areas off the northern coasts of Iceland. One-way ANCOVA and mixed effects models, with depth, bottom temperature and tow duration as covariates, were used to determine differences in the two metrics between areas. In general, these differences were not stat...
Article
Full-text available
Previous work has identified maximum body size as an important functional life-history trait for marine fish species influencing their growth, natural mortality, recruitment, and resilience to exploitation. We use data from a large number of scientific bottom trawl surveys from West Greenland to the Adriatic Sea to compare the distribution of speci...
Method
Full-text available
Manuals describing the methodology of bottom trawl surveys in Icelandic waters are published annually by the Marine Research Institute. The manuals describe the extent of data collection, provide instructions on sampling of biological variables, registration of information, the survey fishing gear and fishing methods. They provide instructions on t...
Article
Full-text available
Elevated ocean temperatures have been predicted to lead to a poleward shift in the latitudinal distribution ranges of fish species. Different responses of fish species to increased temperatures might lead to changes in assemblage structure and local species richness. In this study, the assemblage structure and diversity of groundfish in Icelandic w...
Conference Paper
Full-text available
This study describes recent changes in the spatial distribution and abundance of monkfish in Icelandic waters, based mostly on data collected from the Icelandic groundfish survey (IceGFS) that has been conducted annually since 1985 during the month of March. The stock size of monkfish appears to have been increasing rapidly since 1998 and the speci...
Article
Full-text available
The feeding habits of Greenland halibut (Reinhardtius hippoglossoides) in Icelandic waters were investigated. In total, 1595 Greenland halibut were collected during the period from May 1991 to March 1992. The main prey species were capelin (Mallotus villosus), eelpouts (Lycodes spp.), northern ambereye (Hymenodora glacialis) and northern shrimp (Pa...
Article
Full-text available
Jonasson, J. P., Thorarinsdottir, G., Eiriksson, H., Solmundsson, J., and Marteinsdottir, G. 2007. Collapse of the fishery for Iceland scallop (Chlamys islandica) in Breidafjordur, West Iceland. – ICES Journal of Marine Science, 64: 298–308. The stock index of the Iceland scallop (Chlamys islandica) in Breidafjordur on the west coast of Iceland has...
Article
Full-text available
The feeding ecology of the European shag (Phalacrocorax aristotelis) and the great cormorant (P. carbo) in Iceland was studied. These bird species may affect their marine environment, for instance, by predating on several commercially important fish species in coastal waters. The shag and cormorant diets were studied throughout the year in the peri...
Article
Full-text available
The effect of reduced fishing effort on the demersal fish community, following area closures in 1993, was analysed for two protected areas off the east coast of Iceland, Digranesflak and Breiddalsgrunn. The data were collected using a standardized bottom trawl during groundfish surveys in the period 1985–2004. The aspects of the fish community that...
Article
Full-text available
About 2200 plaice (Pleuronectes platessa) were tagged on spawning and feeding grounds off Iceland. The aim was to reveal the migration pattern of mature plaice and to estimate fidelity rates to spawning and feeding grounds. From a total of 183 plaice tagged on the spawning ground and recaptured in successive spawning seasons, 91% of males and 88% o...
Article
Full-text available
The vertical and horizontal movements of mature plaice (Pleuronectes platessa) on spawning grounds west of Iceland were studied, using conventional anchor tags and electronic data storage tags measuring depth and temperature at specified time intervals. Concurrent to the taggings, information on sex ratios, maturation and spawning was analyzed usin...
Article
Full-text available
We used surveillance radar to track flocks of colonially breeding alcids at Latrabjarg, northwest Iceland, that were returning from their feeding grounds. We compared the flight directions of incoming flocks during the chick-rearing period with alcid densities at sea during both the incubation and chick-rearing periods. The direction of incoming fl...
Article
Full-text available
1. The size of body organs shows adaptive temporal variation in many animal species. The variation in the size of body organs was examined to see if it is also a component of local adaptation to geographical variation in ecological conditions.2. Major body organs were measured in five species of Icelandic seabirds, sampled from two areas where bird...
Article
Full-text available
Stable-nitrogen and carbon isotope ratios (delta(15)N and delta(13)C) were determined in liver tissue samples from six species of Icelandic seabirds. Stomach contents were primarily capelin (Mallotus villosus) in north Iceland, and primarily sandlance (Ammodytes sp.) in south Iceland. Stable isotope signatures also were measured in a range of typic...
Article
Full-text available
The massive expansion in breeding numbers and range of the northern fulmar Fulmarus glacialis over the last two centuries is generally attributed to an increased availability of fish offal and discarded fishes from commercial fisheries. This implies that discards should be a major component in fulmar diets in the more recently colonised areas in th...
Article
Full-text available
The massive expansion in breeding numbers and range of the northern fulmar Fulmarus glacialis over the last two centuries is generally attributed to an increased availability of fish offal and discarded fishes from commercial fisheries. This implies that discards should be a major component in fulmar diets in the more recently colonised areas in th...
Article
Full-text available
The diet of the six most numerous seabird species found in Iceland was investigated during the summers of 1994 and 1995. A total of 1481 stomachs was analysed from common guillemots (Uria aalge), Brü nnich's guillemots (U. lomvia), razorbills (Alca torda), puffins (Fratercula arctica), kittiwakes (Rissa tridactyla), and northern fulmars (Fulmarus g...

Projects

Projects (2)
Project
Groundfish surveys carried out in Icelandic waters by the Marine and Freshwater Research Institute. Main goals are to study changes in abundance, condition and distribution of demersal fish in Icelandic waters, thereby improving the precision of stock assessments.