全球海洋生物多样性热点地区珊瑚寄生的高度多样化的共生藻属类型。

IF 3.3 3区 生物学 Q2 ECOLOGY Microbial Ecology Pub Date : 2024-07-10 DOI:10.1007/s00248-024-02407-x
Ming Sheng Ng, Nathaniel Soon, Lutfi Afiq-Rosli, Ismael Kunning, Ralph R Mana, Ying Chang, Benjamin J Wainwright
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引用次数: 0

摘要

共生双鞭毛藻属(Symbiodiniaceae)的共生双鞭毛藻在促进珊瑚宿主的恢复能力和提高其抗压能力方面发挥着至关重要的作用。当世界上大部分珊瑚屈服于与日益严重和频繁的热漂白事件相关的压力时,巴布亚新几内亚(PNG)的活珊瑚覆盖率仍然是全球最高的,尽管该国周围的水域历来温暖。然而,尽管巴布亚新几内亚的珊瑚覆盖率很高,而且共生藻科植物在其寄主体内发挥的作用也得到了公认,但这些群落在这一全球生物多样性热点地区的特征却尚未得到研究。利用 ITS2 rDNA 基因的高通量测序,我们对巴布亚新几内亚六个地点的四个珊瑚物种(Diploastrea heliopora、Pachyseris speciosa、Pocillopora acuta 和 Porites lutea)的内共生体进行了分析。我们的研究结果表明,Cladocopium 和 Durusdinium 的优势模式与珊瑚三角区的其他珊瑚礁相似,但基因组内和基因组间的差异更大。在不同采集地点观察到了寄主和地点特异性的共生藻科类型变异,这似乎是由环境条件驱动的。值得注意的是,基因组内和基因组间的广泛变异,加上许多以前未报道的序列,凸显了巴布亚新几内亚是一个潜在的共生生物多样性热点地区。这项研究首次描述了巴布亚新几内亚海洋生物多样性热点地区的珊瑚-共生体群落结构,为今后的研究提供了基线。
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Highly Diverse Symbiodiniaceae Types Hosted by Corals in a Global Hotspot of Marine Biodiversity.

Symbiotic dinoflagellates in the genus Symbiodiniaceae play vital roles in promoting resilience and increasing stress tolerance in their coral hosts. While much of the world's coral succumb to the stresses associated with increasingly severe and frequent thermal bleaching events, live coral cover in Papua New Guinea (PNG) remains some of the highest reported globally despite the historically warm waters surrounding the country. Yet, in spite of the high coral cover in PNG and the acknowledged roles Symbiodiniaceae play within their hosts, these communities have not been characterized in this global biodiversity hotspot. Using high-throughput sequencing of the ITS2 rDNA gene, we profiled the endosymbionts of four coral species, Diploastrea heliopora, Pachyseris speciosa, Pocillopora acuta, and Porites lutea, across six sites in PNG. Our findings reveal patterns of Cladocopium and Durusdinium dominance similar to other reefs in the Coral Triangle, albeit with much greater intra- and intergenomic variation. Host- and site-specific variations in Symbiodiniaceae type profiles were observed across collection sites, appearing to be driven by environmental conditions. Notably, the extensive intra- and intergenomic variation, coupled with many previously unreported sequences, highlight PNG as a potential hotspot of symbiont diversity. This work represents the first characterization of the coral-symbiont community structure in the PNG marine biodiversity hotspot, serving as a baseline for future studies.

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来源期刊
Microbial Ecology
Microbial Ecology 生物-海洋与淡水生物学
CiteScore
6.90
自引率
2.80%
发文量
212
审稿时长
3-8 weeks
期刊介绍: The journal Microbial Ecology was founded more than 50 years ago by Dr. Ralph Mitchell, Gordon McKay Professor of Applied Biology at Harvard University in Cambridge, MA. The journal has evolved to become a premier location for the presentation of manuscripts that represent advances in the field of microbial ecology. The journal has become a dedicated international forum for the presentation of high-quality scientific investigations of how microorganisms interact with their environment, with each other and with their hosts. Microbial Ecology offers articles of original research in full paper and note formats, as well as brief reviews and topical position papers.
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