Physiological responses of corals to ocean acidification and copper exposure.

Autor: Bielmyer-Fraser GK; Jacksonville University, United States of America. Electronic address: gbielmy@ju.edu., Patel P; Valdosta State University, United States of America., Capo T; University of Miami, United States of America., Grosell M; University of Miami, United States of America.
Jazyk: angličtina
Zdroj: Marine pollution bulletin [Mar Pollut Bull] 2018 Aug; Vol. 133, pp. 781-790. Date of Electronic Publication: 2018 Jun 22.
DOI: 10.1016/j.marpolbul.2018.06.048
Abstrakt: Acidification and land-based sources of pollution have been linked to widespread declines of coral cover in coastal reef ecosystems. In this study, two coral species, Acropora cervicornis and Pocillopora damicornis were exposed to increased copper at two CO 2 levels for 96 h. Copper accumulation and anti-oxidant enzyme activities were measured. Copper accumulation only increased in A. cervicornis zooxanthellae and corresponded with photosynthetic toxicity. Enzyme activities in both coral species were affected; however, A. cervicornis was more sensitive than P. damicornis, and zooxanthellae were more affected than animal fractions of holobionts. Generally, activities of all anti-oxidant enzymes increased, with copper exposure in corals; whereas, activities of glutathione reductase and to some degree glutathione peroxidase were observed due to increasing CO 2 exposure alone. Exposure to copper in combination with higher CO 2 resulted in a synergistic response in some cases. These results provide insight into mechanisms of copper and CO 2 impacts in corals.
(Copyright © 2018 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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