Preprints
https://doi.org/10.5194/bg-2017-147
https://doi.org/10.5194/bg-2017-147
02 May 2017
 | 02 May 2017
Status: this discussion paper is a preprint. It has been under review for the journal Biogeosciences (BG). The manuscript was not accepted for further review after discussion.

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

Eduardo Sampaio, Ana R. Lopes, Sofia Francisco, Jose R. Paula, Marta Pimentel, Ana L. Maulvault, Tiago Repolho, Tiago F. Grilo, Pedro Pousão-Ferreira, António Marques, and Rui Rosa

Abstract. 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 = 4 ºC) and acidification (ΔpCO2 = 1100 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) 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.

Eduardo Sampaio, Ana R. Lopes, Sofia Francisco, Jose R. Paula, Marta Pimentel, Ana L. Maulvault, Tiago Repolho, Tiago F. Grilo, Pedro Pousão-Ferreira, António Marques, and Rui Rosa
 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Eduardo Sampaio, Ana R. Lopes, Sofia Francisco, Jose R. Paula, Marta Pimentel, Ana L. Maulvault, Tiago Repolho, Tiago F. Grilo, Pedro Pousão-Ferreira, António Marques, and Rui Rosa
Eduardo Sampaio, Ana R. Lopes, Sofia Francisco, Jose R. Paula, Marta Pimentel, Ana L. Maulvault, Tiago Repolho, Tiago F. Grilo, Pedro Pousão-Ferreira, António Marques, and Rui Rosa

Viewed

Total article views: 1,770 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
1,049 659 62 1,770 129 42 57
  • HTML: 1,049
  • PDF: 659
  • XML: 62
  • Total: 1,770
  • Supplement: 129
  • BibTeX: 42
  • EndNote: 57
Views and downloads (calculated since 02 May 2017)
Cumulative views and downloads (calculated since 02 May 2017)

Viewed (geographical distribution)

Total article views: 1,616 (including HTML, PDF, and XML) Thereof 1,613 with geography defined and 3 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Latest update: 28 Mar 2024
Download
Short summary
Through controlled experimental approach, we found that ocean acidification offsets physiological stress prompted by ocean warming and methylmercury contamination. These intertwined mechanisms have great implications in the future fitness of, not only Argyrosomus regius, but also of other teleost fish of commercial and ecological importance, in future ocean scenarios. Our research highlights the need of multi-stressor studies in order to accurately predict future individual and stock conditions.
Altmetrics