Drivers of growth for Atlantic cod (<i>Gadus morhua</i> L.) in Icelandic waters – A Bayesian approach to determine spatiotemporal variation and its causes

Frater, Paul N.; Hrafnkelsson, Birgir; Elvarsson, Bjarki Þór; Stefansson, Gunnar

doi:10.1111/jfb.14051

Cited by 2 publications

(3 citation statements)

References 68 publications

(104 reference statements)

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“…For example, individuals from a particular year class may experience good (or poor) environmental conditions during the juvenile phase and those positive (or negative) effects may be carried over during the life of fish and be manifested in future growth 48 . Such cohort-specific variation in growth was previously found in Icelandic cod 31 , suggesting persistent influences of extrinsic conditions, such as food availability modulated by intraspecific competition. Here, the importance of temperature conditions for the cohort mean growth was supported by the results of the within-group centering of the SST variable.…”

Section: Discussionsupporting

confidence: 73%

“…Some of the potentially important predictors were excluded because the time series of relevant proxies relating to oceanography or prey dynamics are short in comparison with our century-long analysis. For example, the incorporation of time series on abundance of capelin 31 , as well as euphausiids or shrimps, constituting important food resources for Icelandic cod 35,36 , could provide a more complete picture of the environmental drivers of cod growth. The inclusion of large-scale climatic factors (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, we controlled for potential confounding effects of fishing pressure and density-dependence 30 . We selected these potential environmental predictors of the cod growth based on prior ecological knowledge 28 , 31 – 34 , taking into consideration data reliability and availability. Some of the potentially important predictors were excluded because the time series of relevant proxies relating to oceanography or prey dynamics are short in comparison with our century-long analysis.…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Century-long cod otolith biochronology reveals individual growth plasticity in response to temperature

Smoliński

Deplanque-Lasserre

Hjörleifsson

et al. 2020

Sci Rep

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Otolith biochronologies combine growth records from individual fish to produce long-term growth sequences, which can help to disentangle individual from population-level responses to environmental variability. This study assessed individual thermal plasticity of Atlantic cod (Gadus morhua) growth in Icelandic waters based on measurements of otolith increments. We applied linear mixed-effects models and developed a century-long growth biochronology (1908–2014). We demonstrated interannual and cohort-specific changes in the growth of Icelandic cod over the last century which were mainly driven by temperature variation. Temperature had contrasting relationships with growth—positive for the fish during the youngest ages and negative during the oldest ages. We decomposed the effects of temperature on growth observed at the population level into within-individual effects and among‐individual effects and detected significant individual variation in the thermal plasticity of growth. Variance in the individual plasticity differed across cohorts and may be related to the mean environmental conditions experienced by the group. Our results underscore the complexity of the relationships between climatic conditions and the growth of fish at both the population and individual level, and highlight the need to distinguish between average population responses and growth plasticity of the individuals for accurate growth predictions.

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Section: Discussionsupporting

confidence: 73%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Century-long cod otolith biochronology reveals individual growth plasticity in response to temperature

Smoliński

Deplanque-Lasserre

Hjörleifsson

et al. 2020

Sci Rep

View full text Add to dashboard Cite

show abstract

Exploring the role of temperature in observed inter-population differences of Atlantic cod(Gadus morhua)growth with a 4-dimensional modelling approach

Sokolova

Butzin

Dahlke

et al. 2021

ICES Journal of Marine Science

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Atlantic cod (Gadus morhua) is one of the most commercially important fish species in the North Atlantic. Environmental factors, such as water temperatures, influence growth of individuals over time, thus forming population-specific growth patterns across climatic regions. Here we develop an integrative approach to investigate the role of temperature in shaping geographic differences of cod growth in the Celtic Sea, North Sea, Iceland, and Barents Sea. We combine a physiology-based growth model and 50-years observational temperature data of 0.5 × 0.5° spatial resolution to simulate continuous growth of cod. The model generated weight-at-age data for the period 1959–2007 which we compared to observational data from fishery-independent scientific surveys. In the Celtic and the northern North Sea, simulated growth matches well observational data. We also show that relatively warm temperatures in the Celtic Sea facilitate maximum growth rates; future warming is likely to have a negative impact on growth of these cod stocks. Growth simulations in Icelandic waters and the Barents Sea are less consistent with local observational data. More complex growth patterns in these regions are probably shaped by ontogenetic shifts in temperature regimes, feeding conditions and physiological adaptations. These findings should stimulate further research on critical processes to be considered in population-specific projections of growth of cod and productivity.

show abstract

Drivers of growth for Atlantic cod (Gadus morhua L.) in Icelandic waters – A Bayesian approach to determine spatiotemporal variation and its causes

Cited by 2 publications

References 68 publications

Century-long cod otolith biochronology reveals individual growth plasticity in response to temperature

Century-long cod otolith biochronology reveals individual growth plasticity in response to temperature

Exploring the role of temperature in observed inter-population differences of Atlantic cod(Gadus morhua)growth with a 4-dimensional modelling approach

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