The adaptive bleaching hypothesis: Experimental tests of critical assumptions
The adaptive bleaching hypothesis: Experimental tests of critical assumptions
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DOI：
10.2307/1543084
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发表时间：
2001-02-01
影响因子：
1.6
通讯作者：
Coffroth, MA
中科院分区：
文献类型：
--
作者：
Kinzie, RA;Takayama, M;Coffroth, MA
珊瑚白化，即由于共生虫黄藻或其色素的损失而失去颜色，似乎在强度和地理范围上都在增加，这可能与海面温度上升有关。适应性漂白假说（ABH）假定，当环境条件发生变化时，一种或多种虫黄藻的损失迅速，有时不明显，随后形成一个新的共生财团，其中不同的虫黄藻更适合宿主栖息地的新条件。ABH的基本假设包括：（1）不同类型的虫黄藻对环境条件的反应不同，特别是温度。（2）漂白成虫可从环境中间接获得虫黄藻。我们对这些假设进行了简单的测试，结果表明：（1）不同遗传类型的虫黄藻对高温表现出不同的反应;（2）漂白的成虫宿主可以获得藻类共生体，虫黄藻浓度与共生体建立速率之间存在明显的剂量依赖关系;（3）最后，漂白的成虫宿主可以从水柱中获得共生体。
Coral bleaching, the loss of color due to loss of symbiotic zooxanthellae or their pigment, appears to be increasing in intensity and geographic extent, perhaps related to increasing sea surface temperatures. The adaptive bleaching hypothesis (ABH) posits that when environmental circumstances change, the loss of one or more kinds of zooxanthellae is rapidly, sometimes unnoticeably, followed by formation of a new symbiotic consortium with different zooxanthellae that are more suited to the new conditions in the host's habitat. Fundamental assumptions of the ABH include (1) different types of zooxanthellae respond differently to environmental conditions, specifically temperature. and (2) bleached adults can secondarily acquire zooxanthellae from the environment. We present simple tests of these assumptions and show that (1) genetically different strains of zooxanthellae exhibit different responses to elevated temperature, (2) bleached adult hosts can acquire algal symbionts with an apparently dose-dependent relationship between the concentration of zooxanthellae and the rate of establishment of the symbiosis, (3) and finally, bleached adult hosts can acquire symbionts from the water column.