Chronic parrotfish grazing impedes coral recovery after bleaching
Chronic parrotfish grazing impedes coral recovery after bleaching
复制标题
鹦嘴鱼长期吃草阻碍珊瑚白化后的恢复
DOI：
10.1007/s00338-006-0120-y
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发表时间：
2006
期刊：
影响因子：
3.5
通讯作者：
S. Lewis
中科院分区：
文献类型：
--
作者：
R. Rotjan;James L. Dimond;D. Thornhill;J. Leichter;B. Helmuth;D. Kemp;S. Lewis
珊瑚漂白，即珊瑚变得明显苍白，通常失去其内共生虫黄藻（共生藻属），越来越多地威胁着世界各地的珊瑚礁。虽然漂白的近端环境触发因素已相当清楚，但对可能加剧珊瑚漂白或延迟恢复的生理和生态因素知之甚少。我们报告了2004年9月在伯利兹发生的一次白化事件。与完整的珊瑚群落相比，先前被食珊瑚鹦嘴鱼吃草的珊瑚显示出共生体密度的持续减少。此外，放牧珊瑚表现出更大的多样性，其共生体群落的遗传组成，从统一的ITS 2型C7共生藻漂白前的混合组合的共生藻类型漂白后。这些结果表明，慢性捕食可能会加剧环境压力的影响，并通过改变珊瑚虫黄藻共生，这种非生物-生物的相互作用可能有助于漂白过程中的空间变化。
Coral bleaching, in which corals become visibly pale and typically lose their endosymbiotic zooxanthellae (Symbiodinium spp.), increasingly threatens coral reefs worldwide. While the proximal environmental triggers of bleaching are reasonably well understood, considerably less is known concerning physiological and ecological factors that might exacerbate coral bleaching or delay recovery. We report a bleaching event in Belize during September 2004 in which Montastraea spp. corals that had been previously grazed by corallivorous parrotfishes showed a persistent reduction in symbiont density compared to intact colonies. Additionally, grazed corals exhibited greater diversity in the genetic composition of their symbiont communities, changing from uniform ITS2 type C7 Symbiodinium prior to bleaching to mixed assemblages of Symbiodinium types post-bleaching. These results suggest that chronic predation may exacerbate the influence of environmental stressors and, by altering the coral-zooxanthellae symbiosis, such abiotic-biotic interactions may contribute to spatial variation in bleaching processes.