Oxidative stress in the hydrocoral Millepora alcicornis exposed to CO2-driven seawater acidification

Débora Camacho Luz, Yuri Dornelles Zebral, Roberta Daniele Klein, Joseane Aparecida Marques, Laura Fernandes de Barros Marangoni, Cristiano Macedo Pereira, Gustavo Adolpho Santos Duarte, Débora de Oliveira Pires, Clovis Barreira e. Castro, Emiliano Nicolas Calderon, Adalto Bianchini

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Global impacts are affecting negatively coral reefs’ health worldwide. Ocean acidification associated with the increasing CO2 partial pressure in the atmosphere can potentially induce oxidative stress with consequent cellular damage in corals and hydrocorals. In the present study, parameters related to oxidative status were evaluated in the hydrocoral Millepora alcicornis exposed to three different levels of seawater acidification using a mesocosm system. CO2-driven acidification of seawater was performed until reaching 0.3, 0.6 and 0.9 pH units below the current pH of seawater pumped from the coral reef adjacent to the mesocosm. Therefore, treatments corresponded to control (pH 8.1), mild (pH 7.8), intermediate (pH 7.5) and severe (pH 7.2) seawater acidification. After 0, 16 and 30 d of exposure, hydrocorals were collected and the following parameters were analyzed in the holobiont: antioxidant capacity against peroxyl radicals (ACAP), total glutathione (GSHt) concentration, reduced (GSH) and oxidized (GSSG) glutathione ratio (GSH/GSSG), lipid peroxidation (LPO) and protein carbonyl group (PC) levels. ACAP was increased in hydrocorals after 16 d of exposure to intermediate levels of seawater acidification. GSHt and GSH/GSSG did not change over the experimental period. LPO was increased at any level of seawater acidification, while PC content was increased in hydrocorals exposed to intermediate and severe seawater acidification for 30 d. These findings indicate that the antioxidant defense system of M. alcicornis is capable of coping with acidic conditions for a short period of time (16 d). Additionally, they clearly show that a long-term (30 d) exposure to seawater acidification induces oxidative stress with consequent oxidative damage to lipids and proteins, which could compromise hydrocoral health.

Original languageEnglish
Pages (from-to)571-579
Number of pages9
JournalCoral Reefs
Volume37
Issue number2
DOIs
StatePublished - 1 Jun 2018
Externally publishedYes

Keywords

  • Antioxidant capacity
  • Coral reefs
  • Lipid oxidation
  • Mesocosm
  • Ocean acidification
  • Protein oxidation

ASJC Scopus subject areas

  • Aquatic Science

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