Effects of feed restriction on the upper temperature tolerance and heat shock response in juvenile green and white sturgeon

Lee, Seunghyung; Hung, Silas S.O.; Fangue, Nann A.; Haller, Liran Y.; Verhille, Christine E.; Zhao, Juan; Todgham, Anne E.

doi:10.1016/j.cbpa.2016.04.016

Cited by 34 publications

(31 citation statements)

References 69 publications

(93 reference statements)

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“…Similar findings have been observed in juvenile A. transmontanus(Lee et al, 2016), where CTMax was independent of food availability, even when food rations were very low (12.5% OFR). The magnitude of food restriction used in studies is also likely to mediate the observed effect on CTMax.…”

supporting

confidence: 87%

“…Countering our prediction, food restriction had no effect on Upper and lower thermal tolerance limits typically increase with rising acclimation temperature (Beitinger & Bennett, 2000), and as such CTMax of 11°C-acclimated fish was c.2°C lower than 18°Cacclimated fish. Higher CTMax values (1°C higher) have been reported in A. transmontanus despite the use of identical acclimation temperature (18°C), heating rate (0.3°C/min) and end point (LOE) (Lee et al, 2016). However, fish in the previous study were older and larger (205 g; 197 dph) and differences in CTMax probably reflect ontogenetic or size dependent changes in thermal tolerance (Komoroske et al, 2014).…”

Section: Isolated and Combined Effects Of Stressors On Ctmaxmentioning

confidence: 56%

“…Fish were allowed a 1-hr adjustment period before water temperature was increased at a rate of 0.3°C/min (Fangue, Hofmeister, & Schulte, 2006;Sardella, Sanmarti, & Kültz, 2008;Verhille, Todgham, Hung, & Fangue, 2015). Chamber water temperatures were monitored and recorded using an alcohol thermometer calibrated against a certified standard mercury thermometer (Thermo Fisher Scientific), and a calibrated optic shuttle temperature logger (Onset Computer Corporation, Bourne, MA, U.S.A.) also recorded temperature every 15 s. Fish were observed throughout the trials and loss of equilibrium (LOE), defined as an inability to maintain an upright position in the water column for 10 s, was used as an endpoint (Lee et al, 2016). Following LOE, fish were immediately placed in an aerated recovery tank matching acclimation temperature.…”

Section: Critical Thermal Maximamentioning

confidence: 99%

“…Previous studies have shown food deprived fish to have lower upper thermal tolerance (i.e. critical thermal maxima, CTMax) and an inhibited capacity to overexpress heat shock proteins (Hsps; Deng, Wang, Lee, Bai, & Hung, 2009;Han, Huang, Wang, Deng, & Hung, 2012;Lee, Fangue, Verhille, & Todgham, 2016;Woiwode & Adelman, 1992).…”

Section: Introductionmentioning

confidence: 99%

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Stressor interactions in freshwater habitats: Effects of cold water exposure and food limitation on early‐life growth and upper thermal tolerance in white sturgeon, Acipenser transmontanus

et al. 2018

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Limited food availability and altered thermal regimes (e.g. cold water releases from dams) are two common stressors threatening the persistence of fishes inhabiting anthropogenically disturbed freshwater systems. Yet, the combined effects of these stressors remain poorly characterised. To remedy this, we examined the isolated and combined effects of low temperature exposure and food restriction on specific growth rate (SGR, % body mass/day) and upper thermal tolerance (critical thermal maxima, CTMax) in larval white sturgeon (Acipenser transmontanus [Acipenseridae], 32 days post‐hatch, body mass: 0.25 ± 0.03 g, mean ± standard deviation). A 2 × 2 factorial design was implemented with fish exposed to one of two ecologically‐relevant acclimation temperatures (cold exposure: 11°C or a control temperature: 18°C) and one of two food restriction treatments designed to emulate observed declines in food availability (100% or 40% optimal feed rate) for 6 weeks (N: 3 replicate tanks/treatment, 50 fish/tank). Specific growth rate was affected by both low temperature exposure and food restriction in isolation; low temperature exposure reduced SGR by 56.5% and food restriction reduced SGR by 30.6%. Simultaneous exposure to low temperature and food restriction resulted in a greater but less than additive reduction in SGR (80.6%), indicating that the stressors interacted antagonistically. Critical thermal maxima were c. 2°C higher in 18°C‐acclimated fish (CTMax = 30.7 ± 0.4°C, mean ± standard error) compared to 11°C‐acclimated fish (CTMax = 28.6 ± 0.2°C, mean ± standard error); however, CTMax was independent of food restriction in both 11°C‐ and 18°C‐acclimated fish. These data highlight the unpredictability of stressor interactions and may guide holistic conservation strategies, which target co‐occurring stressors in freshwater habitats.

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supporting

confidence: 87%

Section: Isolated and Combined Effects Of Stressors On Ctmaxmentioning

confidence: 56%

Section: Critical Thermal Maximamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stressor interactions in freshwater habitats: Effects of cold water exposure and food limitation on early‐life growth and upper thermal tolerance in white sturgeon, Acipenser transmontanus

et al. 2018

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“…Fasted juvenile Green Sturgeon Acipenser medirostris were less tolerant of elevated temperatures relative to fed individuals (Lee et al. ), indicating that a feedback between nutritional status and the behavioral response to environmental stressors is plausible, but this relationship has not been established for CO 2 . Knowledge of how contexts such as nutritional status can impact both behavioral and physiological responses to elevated CO 2 is important, not only because fish can face high CO 2 naturally but also because such information can be used to define avoidance thresholds or tolerance limits for practitioners looking to deploy CO 2 barriers (Donaldson et al.…”

mentioning

confidence: 99%

Influence of Nutritional Status on Carbon Dioxide Tolerance and Avoidance Behavior in a Freshwater Teleost

2019

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Challenging environmental conditions can induce voluntary behavioral avoidance in animals. Dissolved carbon dioxide (CO2) is an environmental stressor that was previously shown to upregulate the stress axis in fish and also causes voluntary avoidance. Variation in individual state or context, such as whether an animal is fasted or fed, can alter animal behavior, including the response to environmental challenges. In the current study, we sought to define the influence of nutritional status on the response of Largemouth Bass Micropterus salmoides to elevated CO2. Two groups of Largemouth Bass—one fed group and one fasted group—were first subjected to a CO2 shuttling protocol to define avoidance thresholds, followed by a CO2 tolerance protocol to define the time required to lose equilibrium and recover. Data showed that although feeding and fasting had no influence on the avoidance of CO2, fasted fish required 17% longer to lose equilibrium in elevated CO2. Avoidance of elevated CO2 is therefore independent of animal state, but fish in poor nutritional condition from fasting are more tolerant. Thus, managers considering elevated CO2 as a nonphysical barrier to deter fish movements should be cognizant of food availability, as fasted animals may require increased partial pressures of CO2 to ensure successful deterrence.

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Starvation reduces thermal limits of the widespread copepod Acartia tonsa

Rueda Moreno,

Sasaki

2023

Ecology and Evolution

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Organismal thermal limits affect a wide range of biogeographical and ecological processes. Copepods are some of the most abundant animals on the planet and play key roles in aquatic habitats. Despite their abundance and ecological importance, there is limited data on the factors that affect copepod thermal limits, impeding our ability to predict how aquatic ecosystems will be affected by anthropogenic climate change. In a warming ocean, one factor that may have particularly important effects on thermal limits is the availability of food. A recently proposed feedback loop known as “metabolic meltdown” suggests that starvation and exposure to high temperatures interact to drastically reduce organismal thermal limits, increasing vulnerability to warming. To investigate one component of this feedback loop, we examined how starvation affects thermal limits (critical thermal maxima: CTmax) of Acartia tonsa, a widespread estuarine copepod. We found that there was no effect of short‐duration exposure to starvation (up to 2 days). However, after 3 days, there was a significant decrease in the CTmax of starved copepods relative to the fed controls. Our results provide empirical evidence that extended periods of starvation reduce thermal limits, potentially initiating “metabolic meltdown” in this key species of coastal copepod. This suggests that changes in food availability may increase the vulnerability of copepods to increasing temperatures, amplifying the effects of climate change on coastal systems.

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Effects of feed restriction on the upper temperature tolerance and heat shock response in juvenile green and white sturgeon

Cited by 34 publications

References 69 publications

Stressor interactions in freshwater habitats: Effects of cold water exposure and food limitation on early‐life growth and upper thermal tolerance in white sturgeon, Acipenser transmontanus

Stressor interactions in freshwater habitats: Effects of cold water exposure and food limitation on early‐life growth and upper thermal tolerance in white sturgeon, Acipenser transmontanus

Influence of Nutritional Status on Carbon Dioxide Tolerance and Avoidance Behavior in a Freshwater Teleost

Starvation reduces thermal limits of the widespread copepod Acartia tonsa

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