Neuro-oxidative damage and aerobic potential loss of sharks under elevated CO2 and warming

Rosa, Rui; Paula, José Ricardo; Sampaio, Eduardo; Pimentel, Marta S.; Lopes, Ana Rita; Baptista, Miguel; Guerreiro, Miguel; Santos, Catarina; Campos, Derek Felipe; Almeida-Val, Vera Maria Fonseca de; Calado, Ricardo; Diniz, Mário; Repolho, Tiago

doi:10.1007/s00227-016-2898-7

Cited by 46 publications

(23 citation statements)

References 53 publications

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“…Another aspect worth mentioning is the fact that, in the present study, both up-and downregulations of the selected ecotoxicological biomarkers were observed, depending on the tissue and stressor interaction, a trend that is also in agreement with previous findings (e.g., References [24,25,80,83,85]). Such differential tissue biomarker responses to environmental stressors are a result of either (i) the activation of cells' defense mechanisms in order to overcome the stress (in case of biomarker upregulation) or (ii) the depletion of cellular defense mechanisms due to severe and/or long-lasting stress conditions that exceed species' thresholds of physiological tolerance (in case of biomarker downregulation) [24,83].…”

Section: Interactive Effects Of Hg and Climate Change-related Stressosupporting

confidence: 93%

Mercury in Juvenile Solea senegalensis: Linking Bioaccumulation, Seafood Safety, and Neuro-Oxidative Responses under Climate Change-Related Stressors

et al. 2020

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Mercury (Hg) is globally recognized as a persistent chemical contaminant that accumulates in marine biota, thus constituting an ecological hazard, as well as a health risk to seafood consumers. Climate change-related stressors may influence the bioaccumulation, detoxification, and toxicity of chemical contaminants, such as Hg. Yet, the potential interactions between environmental stressors and contaminants, as well as their impacts on marine organisms and seafood safety, are still unclear. Hence, the aim of this work was to assess the bioaccumulation of Hg and neuro-oxidative responses on the commercial flat fish species Solea senegalensis (muscle, liver, and brain) co-exposed to dietary Hg in its most toxic form (i.e., MeHg), seawater warming (ΔT°C = +4 °C), and acidification (pCO2 = +1000 µatm, equivalent to ΔpH = −0.4 units). In general, fish liver exhibited the highest Hg concentration, followed by brain and muscle. Warming enhanced Hg bioaccumulation, whereas acidification decreased this element’s levels. Neuro-oxidative responses to stressors were affected by both climate change-related stressors and Hg dietary exposure. Hazard quotient (HQ) estimations evidenced that human exposure to Hg through the consumption of fish species may be aggravated in tomorrow’s ocean, thus raising concerns from the seafood safety perspective.

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Section: Interactive Effects Of Hg and Climate Change-related Stressosupporting

confidence: 93%

Mercury in Juvenile Solea senegalensis: Linking Bioaccumulation, Seafood Safety, and Neuro-Oxidative Responses under Climate Change-Related Stressors

et al. 2020

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“…This synergistic response pattern links impaired aerobic capacity with reduced embryo survival under exposure to warming and elevated P CO 2 . Previous studies investigating CO 2 effects on the thermal sensitivity of aerobic metabolism in marine fish embryos reported similar results (Rosa et al ., , ; Di Santo, ), while other species or life stages may display higher acclimation capacities (Gräns et al ., ; Flynn et al ., ).…”

Section: Discussionsupporting

confidence: 65%

Effects of ocean acidification increase embryonic sensitivity to thermal extremes in Atlantic cod, Gadus morhua

Dahlke

Leo

Mark

et al. 2016

Global Change Biology

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Thermal tolerance windows serve as a powerful tool for estimating the vulnerability of marine species and their life stages to increasing temperature means and extremes. However, it remains uncertain to which extent additional drivers, such as ocean acidification, modify organismal responses to temperature. This study investigated the effects of CO -driven ocean acidification on embryonic thermal sensitivity and performance in Atlantic cod, Gadus morhua, from the Kattegat. Fertilized eggs were exposed to factorial combinations of two PCO conditions (400 μatm vs. 1100 μatm) and five temperature treatments (0, 3, 6, 9 and 12 °C), which allow identifying both lower and upper thermal tolerance thresholds. We quantified hatching success, oxygen consumption (MO ) and mitochondrial functioning of embryos as well as larval morphometrics at hatch and the abundance of acid-base-relevant ionocytes on the yolk sac epithelium of newly hatched larvae. Hatching success was high under ambient spawning conditions (3-6 °C), but decreased towards both cold and warm temperature extremes. Elevated PCO caused a significant decrease in hatching success, particularly at cold (3 and 0 °C) and warm (12 °C) temperatures. Warming imposed limitations to MO and mitochondrial capacities. Elevated PCO stimulated MO at cold and intermediate temperatures, but exacerbated warming-induced constraints on MO , indicating a synergistic interaction with temperature. Mitochondrial functioning was not affected by PCO . Increased MO in response to elevated PCO was paralleled by reduced larval size at hatch. Finally, ionocyte abundance decreased with increasing temperature, but did not differ between PCO treatments. Our results demonstrate increased thermal sensitivity of cod embryos under future PCO conditions and suggest that acclimation to elevated PCO requires reallocation of limited resources at the expense of embryonic growth. We conclude that ocean acidification constrains the thermal performance window of embryos, which has important implication for the susceptibility of cod to projected climate change.

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“…13: 20160796 were associated with H. ocellatum living in shallow reef and lagoon habitats that naturally experience variable CO 2 levels, which could confer them a certain degree of tolerance to projected future CO 2 concentrations. Contrary to these two studies that encompass acclimation periods varying between 30 and 60 days (table 1), other studies performed in recently hatched juveniles exposed to elevated CO 2 during the entire embryogenesis (more than 200 days of acclimation; table 1) observed significant changes in Fulton's condition index [32], aerobic potential (citrate synthase activity), peroxidative damage in the brain, cholinergic neurotransmission [33] and digestive enzyme activities [34], among other physiological variables. Most of these effects also exhibited significant interactions with elevated temperatures (figure 1).…”

Section: Physiologymentioning

confidence: 79%

“…The physiological effects of simulated end-of-century elevated CO 2 conditions have only been evaluated in four relatively sedentary, benthic species: the temperate lesserspotted (Scyliorhinus canicula) catshark [38] and Port Jackson (H. portusjacksoni) sharks [39,40] and the tropical bamboo (C. punctatum) [32][33][34] and epaulette (H. ocellatum) sharks [35,36] (table 1). Previous studies investigating physiological processes under elevated CO 2 in sharks have been conducted at very high CO 2 levels (.8-10 mm Hg, approximately 10 000-13 000 matm) (e.g.…”

Section: Physiologymentioning

confidence: 99%

Biological responses of sharks to ocean acidification

2017

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Sharks play a key role in the structure of marine food webs, but are facing major threats due to overfishing and habitat degradation. Although sharks are also assumed to be at relatively high risk from climate change due to a low intrinsic rate of population growth and slow rates of evolution, ocean acidification (OA) has not, until recently, been considered a direct threat. New studies have been evaluating the potential effects of end-of-century elevated CO 2 levels on sharks and their relatives' early development, physiology and behaviour. Here, we review those findings and use a meta-analysis approach to quantify the overall direction and magnitude of biological responses to OA in the species of sharks that have been investigated to date. While embryo survival and development time are mostly unaffected by elevated CO 2 , there are clear effects on body condition, growth, aerobic potential and behaviour (e.g. lateralization, hunting and prey detection). Furthermore, studies to date suggest that the effects of OA could be as substantial as those due to warming in some species. A major limitation is that all past studies have involved relatively sedentary, benthic sharks that are capable of buccal ventilation—no studies have investigated pelagic sharks that depend on ram ventilation. Future research should focus on species with different life strategies (e.g. pelagic, ram ventilators), climate zones (e.g. polar regions), habitats (e.g. open ocean), and distinct phases of ontogeny in order to fully predict how OA and climate change will impact higher-order predators and therefore marine ecosystem dynamics.

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Neuro-oxidative damage and aerobic potential loss of sharks under elevated CO2 and warming

Cited by 46 publications

References 53 publications

Mercury in Juvenile Solea senegalensis: Linking Bioaccumulation, Seafood Safety, and Neuro-Oxidative Responses under Climate Change-Related Stressors

Mercury in Juvenile Solea senegalensis: Linking Bioaccumulation, Seafood Safety, and Neuro-Oxidative Responses under Climate Change-Related Stressors

Effects of ocean acidification increase embryonic sensitivity to thermal extremes in Atlantic cod, Gadus morhua

Biological responses of sharks to ocean acidification

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