Oxidative stress and seasonal coral bleaching

被引:380
作者
Downs, CA
Fauth, JE
Halas, JC
Dustan, P
Bemiss, J
Woodley, CM
机构
[1] EnVirtue Biotechnol Inc, Walnut Creek, CA USA
[2] US Natl Ocean & Atmospher Adm, Marine Biotechnol Program, Charleston, SC USA
[3] Coll Charleston, Dept Biol, Charleston, SC 29424 USA
[4] US Natl Ocean & Atmospher Adm, Florida Keys Natl Marine Sanctuary, Key Largo, FL USA
[5] Cousteau Soc, Chesapeake, VA USA
基金
美国国家科学基金会;
关键词
coral bleaching; coral reef; oxidative stress; oxidative damage; stress protein response; free radicals;
D O I
10.1016/S0891-5849(02)00907-3
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
During the past two decades, coral reefs have experienced extensive degradation worldwide. One etiology for this global degradation is a syndrome known as coral bleaching. Mass coral bleaching events are correlated with increased sea-surface temperatures, however, the cellular mechanism underlying this phenomenon is uncertain. To determine if oxidative stress plays a mechanistic role in the process of sea-surface temperature-related coral bleaching, we examined corals along a depth transect in the Florida Keys over a single season that was characterized by unusually high sea-surface temperatures. We observed strong positive correlations between accumulation of oxidative damage products and bleaching in corals over a year of sampling. High levels of antioxidant enzymes and small heat-shock proteins were negatively correlated with levels of oxidative damage products. Corals that experienced oxidative stress had higher chaperonin levels and protein turnover activity. Our results indicate that coral bleaching is tightly coupled to the antioxidant and cellular stress capacity of the symbiotic coral, supporting the mechanistic model that coral bleaching (zooxanthellae loss) may be a final strategy to defend corals from oxidative stress. (C) 2002 Elsevier Science Inc.
引用
收藏
页码:533 / 543
页数:11
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