Bioenergetic condition of anchovy and sardine in the Bay of Biscay and English Channel

Gatti, Paul; Cominassi, Louise; Duhamel, Erwan; Grellier, Patrick; Delliou, Hervé Le; Mestre, Sophie Le; Petitgas, Pierre; Rabiller, Manuella; Spitz, Jérôme; Huret, Martin

doi:10.1016/j.pocean.2017.12.006

Cited by 22 publications

(26 citation statements)

References 53 publications

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“…It may also explain the higher values recorded for energy density. The consistency with previous values recorded over the 2002-2010 period seem to demonstrate some stability of ecosystem functioning over the last two decades (Dubreuil and Petitgas, 2009;Gatti et al, 2018;Spitz and Jouma'a, 2013). As a result, and even if the minimum trophic level is lower in the Bay of Biscay than in the Gulf of Lions, the biomass maximum occurs at an upper trophic level in the Bay of Biscay.…”

Section: Productivity and Community Structuresupporting

confidence: 88%

Primary production and depth drive different trophic structure and functioning of fish assemblages in French marine ecosystems

Cresson

Chouvelon

Bustamante

et al. 2020

Progress in Oceanography

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Section: Productivity and Community Structuresupporting

confidence: 88%

Primary production and depth drive different trophic structure and functioning of fish assemblages in French marine ecosystems

Cresson

Chouvelon

Bustamante

et al. 2020

Progress in Oceanography

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“…In the latter regions, the reserve buffer is filled in autumn to prepare for the winter, while it is almost constant throughout the year in the Aegean Sea. The model predicts a positive latitudinal gradient in energy density before winter from the Aegean to the North Sea, a feature that was described for both anchovy and sardine between the Bay of Biscay and the English Channel (Gatti et al 2018). This pattern was described as an adaptive allocation strategy to the seasonal variability with latitude, under a size-selective winter mortality constraint (Schultz & Conover 1999).…”

Section: Seasonality In Energy Dynamicsmentioning

confidence: 78%

“…This pattern was described as an adaptive allocation strategy to the seasonal variability with latitude, under a size-selective winter mortality constraint (Schultz & Conover 1999). In the Northwestern Mediterranean, energy density is highest in spring and lowest in autumn (Albo-Puigserver et al 2017), while in the Bay of Biscay it is lowest at the end of the winter−spring period and highest in autumn (Dubreuil & Petitgas 2009, Gatti et al 2018. This sea-sonal variability in energy density follows the seasonal variability in food availa bility in the respective regions.…”

Section: Seasonality In Energy Dynamicsmentioning

confidence: 97%

Variation in life-history traits of European anchovy along a latitudinal gradient: a bioenergetics modelling approach

Huret¹,

Tsiaras²,

Daewel³

et al. 2019

Mar. Ecol. Prog. Ser.

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Anchovy Engraulis encrasicolus distribution in European waters spans from the Mediterranean Sea to the North Sea, and is expected to expand further north with global warming. Observations from the eastern Mediterranean (North Aegean Sea), the Bay of Biscay and the North Sea reveal latitudinal differences in growth, maximum size, fecundity and timing of reproduction. We set up a mechanistic framework combining a bioenergetics model with regional physical−biogeochemical models providing temperature and zooplankton biomass to investigate the underlying mechanisms of variation in these traits. The bioenergetics model, based on the Dynamic Energy Budget theory and initially calibrated in the Bay of Biscay, was used to simulate growth and reproduction patterns. Environment partly explained the increased growth rate and larger body size towards the north. However, regional calibration of the maximum assimilation rate was necessary to obtain the best model fit. This suggests a genetic adaptation, with a pattern of cogradient variation with increasing resource towards the north, in addition to a countergradient thermal adaptation. Overall, the seasonal energy dynamics supports the pattern of body-size scaling with latitude, i.e. food-limited growth but low maintenance costs in the warm Aegean Sea, and larger size in the North Sea allowing sufficient storage capacity for overwintering. Further, the model suggests a synchronisation of reproductive timing with environmental seasonality as a trade-off between thresholds of temperature and reserves for spawning and overwintering, respectively. Finally, low temperature, short productive and spawning seasons, and insufficient reserves for overwintering appear to be current limitations for an expansion of anchovy to the Norwegian Sea.

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“…This is illustrated by a wider maturation envelope in autumn. Contrary to the autumn period when sardines have benefited from both spring and summer periods to store energy reserves (McBride et al, 2015), sardines emerge at the end of the overwintering period with, on average, a very low body condition (Gatti et al, 2018;Véron et al, 2020). The maturation envelope represents most of the combinations of size and condition at which sardine maturation can occur (Heino and Dieckmann, 2008) and the autumn maturation envelope could represent the strong variability in both growth rates and ability of individuals to store reserves.…”

Section: Impact Of Body Condition On Maturation Processmentioning

confidence: 99%

Determinism of Temporal Variability in Size at Maturation of Sardine Sardina pilchardus in the Bay of Biscay

et al. 2020

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Age and size at maturation appear as key parameters governing the dynamics of a population as they affect growth rate, fecundity, and survival. The expression of such life history traits is determined by genetic make-up and modulated by environmental factors mainly through phenotypic plasticity. Moreover, fishing, besides decreasing population size and changing demographic composition can alter allelic frequencies through fisheries-induced evolution by selecting for some particular traits. In the Bay of Biscay, a decreasing trend in both sardine body condition and size-at-age has recently been pointed out at the population level. The Probabilistic Maturation Reaction Norm (PMRN) approach was applied to help disentangle phenotypic plasticity and genetic changes. Based on the analysis of sardine spawning seasonality, PMRN was estimated by considering body condition as additional life-history state variable to predict the onset of maturation. The resulting PMRN was then used to investigate temporal trends in reaction norm midpoints to test whether changes in length at maturation can be explained by plastic and/or evolutionary adaptive change. Overall, our results emphasize for the first time that including sardine body condition as explanatory variable improves predictions of maturation probability. We found that better individual condition increases maturation probability. The assessment of temporal changes in length at maturation confirms the low plasticity in this trait for a species maturing mostly at age-1 and advocates for the use of a monthly time scale when investigating PMRNs for this species. Beside environmental variables included in this analysis (water temperature, chlorophyll-a, and population biomass) that only show a weak correlation with PMRN midpoints, our results reveal no evidence for recent fisheries-induced evolution in the sardine stock of the Bay of Biscay. They suggest that the short-term variability in length at maturation is strongly dependent upon individual growth which is likely driven by environmental factors. For sardine fisheries management, our study highlights the need to consider both the length-composition data and the seasonality within a stock assessment model. Finally, we discuss the fact that considering individual growth trajectories should improve our understanding of the relationship between environmental variability and changes in maturation for sardine.

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Bioenergetic condition of anchovy and sardine in the Bay of Biscay and English Channel

Cited by 22 publications

References 53 publications

Primary production and depth drive different trophic structure and functioning of fish assemblages in French marine ecosystems

Primary production and depth drive different trophic structure and functioning of fish assemblages in French marine ecosystems

Variation in life-history traits of European anchovy along a latitudinal gradient: a bioenergetics modelling approach

Determinism of Temporal Variability in Size at Maturation of Sardine Sardina pilchardus in the Bay of Biscay

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