Microbial diversity associated with four functional groups of benthic reef algae and the reef-building coral Montastraea annularis
Microbial diversity associated with four functional groups of benthic reef algae and the reef-building coral Montastraea annularis
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DOI：
10.1111/j.1462-2920.2010.02419.x
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发表时间：
2011-05-01
影响因子：
5.1
通讯作者：
Rohwer, Forest L.
中科院分区：
文献类型：
--
作者：
Barott, Katie L.;Rodriguez-Brito, Beltran;Rohwer, Forest L.
珊瑚礁底栖动物主要由珊瑚和藻类栖息，它们经常相互直接竞争空间。许多研究表明，与珊瑚有关的细菌不同于周围的海水，至少部分具有物种特异性(即同一珊瑚物种上的相同细菌物种)。在这里，我们将这些微生物研究扩展到珊瑚礁上发现的四个主要藻类生态功能群：直立和结壳的钙化藻类、肉质藻类和草坪藻，并将结果与在造礁珊瑚Montastraea Cirularis上发现的群落进行比较。利用16S rDNA标记焦磷酸测序发现，不同的藻属都有独特的细菌群落，而且这些群落通常比珊瑚上的群落更多样化。虽然大多数与珊瑚有关的细菌与已知的异养生物有关，主要消耗富含碳的珊瑚粘液，但与藻类相关的群落中有很高比例的自养生物。与藻类相关的自养细菌大多是蓝藻，可能对藻类的氮循环起重要作用。与藻类相关的光合作用真核生物也有丰富的多样性，包括原生生物、硅藻和其他微藻。总之，这些观察结果支持这样一种假设，即珊瑚礁是一片由独特微生物群落组成的广阔景观，并将全息生物的概念扩展到海底藻类。
P>The coral reef benthos is primarily colonized by corals and algae, which are often in direct competition with one another for space. Numerous studies have shown that coral-associated Bacteria are different from the surrounding seawater and are at least partially species specific (i.e. the same bacterial species on the same coral species). Here we extend these microbial studies to four of the major ecological functional groups of algae found on coral reefs: upright and encrusting calcifying algae, fleshy algae, and turf algae, and compare the results to the communities found on the reef-building coral Montastraea annularis. It was found using 16S rDNA tag pyrosequencing that the different algal genera harbour characteristic bacterial communities, and these communities were generally more diverse than those found on corals. While the majority of coral-associated Bacteria were related to known heterotrophs, primarily consuming carbon-rich coral mucus, algal-associated communities harboured a high percentage of autotrophs. The majority of algal-associated autotrophic Bacteria were Cyanobacteria and may be important for nitrogen cycling on the algae. There was also a rich diversity of photosynthetic eukaryotes associated with the algae, including protists, diatoms, and other groups of microalgae. Together, these observations support the hypothesis that coral reefs are a vast landscape of distinctive microbial communities and extend the holobiont concept to benthic algae.