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Bacterial communities of oceanic sea star (Asteroidea: Echinodermata) larvae

机译：海洋海星（小行星：Echinodermata）幼虫的细菌群落

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Planktotrophic sea star larvae of several species are abundant in oligotrophic waters of the Gulf Stream, western Sargasso Sea, and Caribbean Sea. One abundant larval morphotype at the bipinnaria stage of development is unusual in its ability to constitutively produce clones and in harboring a community of auto-fluorescent bacteria. We hypothesized that the bacterial community would be distinct in these larvae compared to those that do not consistently reproduce clonally. Three sea star larval morphotypes were collected in the Gulf Stream off the coast of Florida. We used DNA-based maximum likelihood phylogenetic analyses to taxonomically classify the larvae and 16S rDNA profiling by deep sequencing to characterize the bacterial communities harbored within. The cloning bipinnaria and non-cloning brachiolaria morphotypes were determined to be a single species of Asteroidea in the family Oreasteridae. The third morphotype, a non-cloning bipinnaria, was identified as Mithrodia clavigera. With bacterial 16S rDNA profiling, we found that the two species of larvae harbor bacterial communities distinct from each other. The Oreasteridae bacterial community at both developmental stages has a photosynthetic Cyanobacteria Synechococcus sp. as the most abundant bacteria. The M. clavigera larvae host a flora consisting primarily of Gammaproteo-bacteria. The identification of the larval microbiomes is a step toward understanding their host-microbe interactions. Specifically, the association of photosynthetic bacteria with cloning larvae allows for future assessments of whether the bacteria supplement the nutrition of the larvae during extended periods of development and clonal reproduction in open ocean regions where phytoplankton food for the larvae may be in limited supply.
机译：在墨西哥湾流，萨尔加索海西部和加勒比海的贫营养水域中，数种浮游性海星幼虫大量存在。在双pinnaria发育阶段，一种丰富的幼虫形态是不寻常的，因为它能够组成性地产生克隆，并具有自发荧光细菌群落。我们假设，与未持续克隆繁殖的幼虫相比，这些幼虫中的细菌群落是不同的。在佛罗里达海岸附近的墨西哥湾流中收集了三种海星幼虫形态型。我们使用基于DNA的最大似然系统发育分析，通过深度测序对幼虫和16S rDNA谱进行分类，以鉴定其中所含细菌群落的特征。克隆的双pinnaria和非克隆的腕兰形态被确定为Oreasteridae科中的小行星的一个单一物种。第三种形态型是非克隆的双子叶植物，被鉴定为密闭丝状线虫。通过细菌16S rDNA分析，我们发现两种幼虫具有彼此不同的细菌群落。在两个发育阶段的Oreasteridae细菌群落都具有光合作用蓝细菌Syechococcus sp。作为最丰富的细菌。克氏梭菌幼虫具有主要由γ-蛋白细菌组成的菌群。幼虫微生物群的鉴定是迈向了解其宿主-微生物相互作用的一步。具体而言，光合细菌与克隆幼虫的联系可以在未来的评估中确定细菌是否在开放海洋区域的长期发育和克隆繁殖期间补充了幼虫的营养，而在这些海洋中，幼体的浮游植物食物可能供应有限。

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  • 来源
    《Marine biology》 |2016年第7期|162.1-162.14|共14页
  • 作者

    Galac Madeline R.; Bosch Isidro; Janies Daniel A.;

  • 作者单位

    Univ N Carolina, Dept Bioinformat & Genom, Charlotte, NC 28223 USA;

    SUNY Coll Geneseo, Dept Biol, Geneseo, NY 14454 USA;

    Univ N Carolina, Dept Bioinformat & Genom, Charlotte, NC 28223 USA;

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