Variations in length and growth of Greenland Halibut juveniles in relation to environmental conditions

Youcef, Wahiba Ait; Lambert, Yvan; Audet, Céline

doi:10.1016/j.fishres.2015.01.007

Cited by 14 publications

(25 citation statements)

References 46 publications

(45 reference statements)

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“…at 5 °C (e.g. Dupont‐Prinet et al ., ; Youcef et al ., ) and with the known preference of this species for cold water (Gundersen et al ., ). Despite a lack of records below 16% sat.…”

Section: Resultsmentioning

confidence: 78%

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Marine species in ambient low‐oxygen regions subject to double jeopardy impacts of climate change

Stortini

Chabot

Shackell

2016

Global Change Biology

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We have learned much about the impacts of warming on the productivity and distribution of marine organisms, but less about the impact of warming combined with other environmental stressors, including oxygen depletion. Also, the combined impact of multiple environmental stressors requires evaluation at the scales most relevant to resource managers. We use the Gulf of St. Lawrence, Canada, characterized by a large permanently hypoxic zone, as a case study. Species distribution models were used to predict the impact of multiple scenarios of warming and oxygen depletion on the local density of three commercially and ecologically important species. Substantial changes are projected within 20-40 years. A eurythermal depleted species already limited to shallow, oxygen-rich refuge habitat (Atlantic cod) may be relatively uninfluenced by oxygen depletion but increase in density within refuge areas with warming. A more stenothermal, deep-dwelling species (Greenland halibut) is projected to lose ~55% of its high-density areas under the combined impacts of warming and oxygen depletion. Another deep-dwelling, more eurythermal species (Northern shrimp) would lose ~4% of its high-density areas due to oxygen depletion alone, but these impacts may be buffered by warming, which may increase density by 8% in less hypoxic areas, but decrease density by ~20% in the warmest parts of the region. Due to local climate variability and extreme events, and that our models cannot project changes in species sensitivity to hypoxia with warming, our results should be considered conservative. We present an approach to effectively evaluate the individual and cumulative impacts of multiple environmental stressors on a species-by-species basis at the scales most relevant to managers. Our study may provide a basis for work in other low-oxygen regions and should contribute to a growing literature base in climate science, which will continue to be of support for resource managers as climate change accelerates.

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“…at 5 °C (e.g. Dupont‐Prinet et al ., ; Youcef et al ., ) and with the known preference of this species for cold water (Gundersen et al ., ). Despite a lack of records below 16% sat.…”

Section: Resultsmentioning

confidence: 78%

“…() confirmed the reduction in aerobic scope when DO is < 30% sat., whereas Youcef et al . () found a decrease in growth rate at DO < 25% sat. Further, this species is stenothermal; that is, it is found within a narrow temperature range, −1–6 °C (Scott & Scott, ; Gundersen et al ., ).…”

Section: Methodsmentioning

confidence: 95%

Marine species in ambient low‐oxygen regions subject to double jeopardy impacts of climate change

Stortini

Chabot

Shackell

2016

Global Change Biology

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“…The tows lasted 30 minutes at speeds of 2 3 knots; depths varied between 175 and 275 m but most captures occurred at 235 m. Juveniles between 20 and 32 cm were selected. According to Ait Youcef et al (2015) and Bourdages et al (2016), these lengths should correspond to two-year-old juveniles. The juveniles were driven from Rimouski to the Maurice-Lamontagne Institute (DFO; 48° 38' 25 N, 68° 9' 21 W), a distance of 34 km, in insulated aerated tanks.…”

Section: Capture Rearing Conditions and Experimental Designmentioning

confidence: 97%

Influence of sex on growth of juvenile Greenland halibut (Reinhardtius hippoglossoides) in the Estuary and Gulf of St. Lawrence

2019

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Understanding growth in early life stages is primordial in commercial fisheries management, but studies dealing with growth trajectory divergences occurring during the juvenile stage are scarce. We surveyed growth of individually tagged two-year-old juvenile Greenland halibut captured in the wild, and maintained at 4°C for 17 months. At the end of the experiment, they were still at the juvenile stage (no ovary or testis development through the maturation stage).In the absence of energetic allocation to gonad development, female juveniles were larger than male juveniles, with a greater gain in mass and length. Female juveniles rapidly reached a higher Fulton condition index while maintained in captivity compared to male juveniles. However, no difference in glycogen, lipid, or protein liver composition or muscle energy storage was found between the sexes. Plasma cortisol was higher in male juveniles, suggesting males were more sensitive to captivity than females. Pre-maturation divergences in juvenile growth could participate in or accentuate the size-related sexual dimorphism observed in nature among adults.

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“…, Ait Youcef et al. ). Jonsson and Jonsson () recently discussed how conditions fish encounter early in their life cycle could leave lasting effects on morphology, growth rate, life history, and behavioral traits.…”

Section: Discussionmentioning

confidence: 99%

Trade‐offs between accuracy and interpretability in vonBertalanffy random‐effects models of growth

Vincenzi

Crivellì

Munch

et al. 2016

Ecological Applications

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Better understanding of variation in growth will always be an important problem in ecology. Individual variation in growth can arise from a variety of processes; for example, individuals within a population vary in their intrinsic metabolic rates and behavioral traits, which may influence their foraging dynamics and access to resources. However, when adopting a growth model, we face trade-offs between model complexity, biological interpretability of parameters, and goodness of fit. We explore how different formulations of the von Bertalanffy growth function (vBGF) with individual random effects and environmental predictors affect these trade-offs. In the vBGF, the growth of an organism results from a dynamic balance between anabolic and catabolic processes. We start from a formulation of the vBGF that models the anabolic coefficient (q) as a function of the catabolic coefficient (k), a coefficient related to the properties of the environment (γ) and a parameter that determines the relative importance of behavior and environment in determining growth (ψ). We treat the vBGF parameters as a function of individual random effects and environmental variables. We use simulations to show how different functional forms and individual or group variability in the growth function's parameters provide a very flexible description of growth trajectories. We then consider a case study of two fish populations of Salmo marmoratus and Salmo trutta to test the goodness of fit and predictive power of the models, along with the biological interpretability of vBGF's parameters when using different model formulations. The best models, according to AIC, included individual variability in both k and γ and cohort as predictor of growth trajectories, and are consistent with the hypothesis that habitat selection is more important than behavioral and metabolic traits in determining lifetime growth trajectories of the two fish species. Model predictions of individual growth trajectories were largely more accurate than predictions based on mean size-at-age of fish. Our method shares information across individuals, and thus, for both fish populations investigated, allows using a single measurement early in the life of individual fish or cohort to obtain accurate predictions of lifetime individual or cohort size-at-age.

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Variations in length and growth of Greenland Halibut juveniles in relation to environmental conditions

Cited by 14 publications

References 46 publications

Marine species in ambient low‐oxygen regions subject to double jeopardy impacts of climate change

Marine species in ambient low‐oxygen regions subject to double jeopardy impacts of climate change

Influence of sex on growth of juvenile Greenland halibut (Reinhardtius hippoglossoides) in the Estuary and Gulf of St. Lawrence

Trade‐offs between accuracy and interpretability in vonBertalanffy random‐effects models of growth

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