Symbiodinium biogeography tracks environmental patterns rather than host genetics in a key Caribbean reef-builder, Orbicella annularis.
Symbiodinium biogeography tracks environmental patterns rather than host genetics in a key Caribbean reef-builder, Orbicella annularis.
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DOI：
10.1098/rspb.2016.1938
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发表时间：
2016-11-16
期刊：
影响因子：
--
通讯作者：
Stevens JR
中科院分区：
文献类型：
--
作者：
Kennedy EV;Tonk L;Foster NL;Chollett I;Ortiz JC;Dove S;Hoegh-Guldberg O;Mumby PJ;Stevens JR
造礁珊瑚的生理性能是珊瑚宿主和共生藻类共同作用的结果。众所周知，环环环孢霉（Orbicella annularis）是大加勒比海地区主要的造礁珊瑚，就其共生菌类型的多样性而言，环环环孢霉是一种灵活的宿主，但目前尚不确定这种多样性在整个加勒比地区是如何变化的，以及共生群落的空间变异性是否与环环环孢霉基因型或环境有关。本文以共生菌- its2基因为目标，在前所未有的空间尺度上对O. annularis寄主的显性共生菌进行了表征和定位。我们揭示了西北-东南在加勒比地区的划分，无论是在主要的共生类群寄主和组合多样性方面。结合一系列环境和遗传因素的多元回归分析表明，观察到的空间格局主要由慢性热应激（夏季温度）解释，与宿主基因型无关。此外，我们能够将特定共生菌类型的存在与当地环境驱动因素联系起来（例如，共生菌C7与夏季较冷的地区有关，共生菌B1j与营养负荷有关，共生菌B17与浊度有关），这些关联以前没有被描述过。
The physiological performance of a reef-building coral is a combined outcome of both the coral host and its algal endosymbionts, Symbiodinium. While Orbicella annularis—a dominant reef-building coral in the Wider Caribbean—is known to be a flexible host in terms of the diversity of Symbiodinium types it can associate with, it is uncertain how this diversity varies across the Caribbean, and whether spatial variability in the symbiont community is related to either O. annularis genotype or environment. Here, we target the Symbiodinium-ITS2 gene to characterize and map dominant Symbiodinium hosted by O. annularis at an unprecedented spatial scale. We reveal northwest–southeast partitioning across the Caribbean, both in terms of the dominant symbiont taxa hosted and in assemblage diversity. Multivariate regression analyses incorporating a suite of environmental and genetic factors reveal that observed spatial patterns are predominantly explained by chronic thermal stress (summer temperatures) and are unrelated to host genotype. Furthermore, we were able to associate the presence of specific Symbiodinium types with local environmental drivers (for example, Symbiodinium C7 with areas experiencing cooler summers, B1j with nutrient loading and B17 with turbidity), associations that have not previously been described.
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影响因子：
9.2
作者：
Kennedy, Emma V.;Perry, Chris T.;Mumby, Peter J.
通讯作者：
Mumby, Peter J.
影响因子：
2.5
作者：
Edmunds, Peter J.;Pochon, Xavier;Gates, Ruth D.
通讯作者：
Gates, Ruth D.
影响因子：
3.5
作者：
Kennedy, Emma V.;Foster, Nicola L.;Stevens, Jamie R.
通讯作者：
Stevens, Jamie R.
影响因子：
56.9
作者：
KNOWLTON, N;WEIL, E;GUZMAN, HM
通讯作者：
GUZMAN, HM
影响因子：
4.9
作者：
Baums, IB;Miller, MW;Hellberg, ME
通讯作者：
Hellberg, ME