Habitat selection disruption and lateralization impairment of cryptic flatfish in a warm, acid, and contaminated ocean

Sampaio, Eduardo; Maulvault, Ana Luísa; Lopes, Vanessa M.; Paula, José Ricardo; Barbosa, Vera; Alves, Ricardo; Pousão-Ferreira, Pedro; Repolho, Tiago; Marques, António; Rosa, Rui

doi:10.1007/s00227-016-2994-8

Cited by 24 publications

(33 citation statements)

References 61 publications

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“…Despite previous evidence that lowered pH (< 7.0 units) increases Hg accumulation in freshwater fish (Haines et al, 1992;Ponce and Bloom, 1991), the current findings do not reflect this pattern, arguably due to the magnitude of pH decrease (here we used pH 7.5). Instead, our results support other reports demonstrating that fish exposed to hypercapnia may display metabolic decrease due to prioritization of CO2-excretory physiological processes (Perry et al, 1988;Sampaio et al, 2016). Thus, taking also into account that occurrence of both stressors lowers physiological (and consequently metabolic) thresholds (Harvey et al, 2013;Rosa et al, 2013), it is likely that a certain degree of metabolic arrest played a key role on HgT concentration decrease.…”

Section: Environmental Influence On Mercury Accumulationsupporting

confidence: 89%

“…Mercury accumulation can cause deleterious effects, such as physiological distress, i.e. activation of antioxidant and xenobiotic defense (Gonzalez et al, 2005;Mieiro et al, 2010), behavioural and organ functionality impairments (Berntssen et al, 2003;Sampaio et al, 2016), ultimately, mortality (Coccini et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

“…In parallel, severe acidification (pH < 7) increases metal availability (Wiener et al, 1990) and toxicity (Han et al, 2014). However, this effect may be offset by CO2-linked metabolism decrease, leading to lower mercury accumulation via feeding (Sampaio et al, 2016;Schiedek et al, 2007). Under environmental stressor exposure, a general deleterious biochemical pathway triggered is the formation of oxygen reactive species (ROS) in the organism's cells.…”

Section: Introductionmentioning

confidence: 99%

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Ocean acidification dampens warming and contamination effects on the physiological stress response of a commercially important fish

Sampaio

Lopes

Francisco

et al. 2017

Preprint

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Increases in carbon dioxide (CO2) and other greenhouse gases emissions are leading to changes in ocean temperature and carbonate chemistry, the so-called ocean warming and acidification phenomena, respectively. Methylmercury (MeHg) is the most abundant form of mercury (Hg), well-known for its toxic effects on biota and environmental persistency. Despite more than likely co-occurrence in future oceans, the interactive effects of these stressors are largely unknown. Here we assessed organ-dependent Hg accumulation (gills, liver and muscle) within a warming (ΔT&thinsp;=&thinsp;4&thinsp;ºC) and acidification (ΔpCO2&thinsp;=&thinsp;1100&thinsp;µatm) context, and the respective phenotypic responses of molecular chaperone and antioxidant enzymatic machineries, in a commercially important fish (the meagre Argyrosomus regius). After 30 days of exposure, although no mortalities were observed in any treatments, Hg concentration was significantly enhanced under warming conditions, significantly more so in the liver. On the other hand, increased CO2 decreased Hg accumulation and, despite negative effects prompted as a sole stressor, consistently elicited an antagonistic effect with temperature and contamination on oxidative stress (catalase, superoxide dismutase and glutathione-S-tranferase activities) and heat shock (Hsp70 levels) responses. We argue that the mechanistic interactions are grounded on simultaneous increase in excessive hydrogen (H+) and reactive oxygen species (e.g. O2&minus;) free radicals, and subsequent chemical reaction equilibrium balancing. Additional multi-stressor experiments are needed to understand such biochemical mechanism and further disentangle interactive (additive, synergistic or antagonistic) stressor effects on fish ecophysiology in the oceans of tomorrow.

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Section: Environmental Influence On Mercury Accumulationsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ocean acidification dampens warming and contamination effects on the physiological stress response of a commercially important fish

Sampaio

Lopes

Francisco

et al. 2017

Preprint

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“…In line with these impacts, previous studies on marine species exposed to MeHg reported altered molecular responses, including enhanced oxidative stress, tissue damage [21], endocrine disruption, and genotoxicity [22]. Furthermore, since brain tissues are relatively permeable to MeHg [23], this compound is neurotoxic, promoting negative impacts in vertebrate species cholinergic systems, including alterations of acetylcholinesterase (AchE) activity [24,25], as well as sensory and cognitive impairments [26].…”

Section: Introductionmentioning

confidence: 86%

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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“…Massaro et al ., ; Rada et al ., ) and to understand how they may respond to anthropogenic threats, such as climate change (e.g. Sampaio et al ., , ; Stuhldreher & Fartmann, ).…”

Section: Introductionmentioning

confidence: 99%

Geographic variation in the habitat preference of a scarce predatory insect: evolutionary and conservation perspectives

Sloggett

Zeilstra²

2020

Ecological Entomology

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1. While there has been considerable focus on prey occurrence as a factor determining the habitat preference of predators, the roles of other factors related to the habitat are less well characterised.2. In aphidophagous ladybird beetles (Coleoptera: Coccinellidae), a number of species are more restricted in the habitats in which they live than are their prey. A number of such ladybirds appear to show geographic variation in habitat preference.3. To better understand these phenomena, this study considered geographic variation in habitat preference in one such species, the 5-spot ladybird Coccinella quinquepunctata. Because of this ladybird's scarcity, a combination of over 20 years' observations, habitat surveys and online data was used to reach the study's conclusions.4. The data collected indicate that the ladybird is specialised in pioneer habitats close to water, but broadens its range to non-riverine pioneer habitats in north-west continental Europe, where it is likely that a damper (micro)climate allows it to do so. Thus, microclimatic factors appear to be important in determining the habitat of this and probably other predators that are not constrained by prey occurrence. 5. Although threatened by river management elsewhere, in north-western Europe, this species clearly benefits from human activity, which creates many of the disturbed habitats it colonises there. This finding provides further support for the contention that many ladybirds are net beneficiaries of human influence, although they are often characterised as threatened.

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Habitat selection disruption and lateralization impairment of cryptic flatfish in a warm, acid, and contaminated ocean

Cited by 24 publications

References 61 publications

Ocean acidification dampens warming and contamination effects on the physiological stress response of a commercially important fish

Ocean acidification dampens warming and contamination effects on the physiological stress response of a commercially important fish

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

Geographic variation in the habitat preference of a scarce predatory insect: evolutionary and conservation perspectives

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