Seasonal changes of antioxidant and oxidative parameters in the coralPocillopora capitataon the Pacific coast of Mexico

Abstract

AbstractThe physiological responses of the coralPocillopora capitatato environmental conditions common in winter and summer were studied in 2007 during February–March (winter) and June–July (summer) at La Boquita reef (Manzanillo, Colima, Mexico). Shallow and deep sampling stations were established at different distances from a small jetty built next to the Juluapan Lagoon. We analyzed superoxide radicals () and lipid peroxidants (TBARS); the activities of superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), glutathione reductase (GR), and glutathione‐S‐transferase (GST); chlorophylla(Chla), zooxanthellae density (ZD); and mycosporine‐like amino acids (MAAs). Our results showed that the, TBARS, CAT, GST, MAAs, and Chla,levels were significantly higher in summer (P < 0.05); no seasonal difference was found for GPx, GR or ZD. We found significant differences (P < 0.05) in winter only for Chlaand ZD at shallow sites and, in contrast, forat deeper sites. The results of this study indicate that increasing temperature and radiation associated with seasonal changes (from winter to summer), the efficiency of the enzymes GST, CR and GPX, and the production of MAAs together form a powerful mechanism forP. capitatato offset the detrimental effects of environmental change.