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首页> 外文期刊>Marine ecology progress series >Diversity of dinoflagellate symbionts in Red Sea soft corals: mode of symbiont acquisition matters
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Diversity of dinoflagellate symbionts in Red Sea soft corals: mode of symbiont acquisition matters

机译:红海软珊瑚中鞭毛藻共生体的多样性:共生体获取方式至关重要

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摘要

Symbiotic associations are ubiquitous in terrestrial and marine environments and are of great ecological importance. The onset of a symbiotic relationship differs among associations. Symbionts can be vertically transmitted from host parent to offspring or they can be acquired horizontally from the surrounding environment with each new host generation. Cnidarian-algal symbioses, the subject of our study, exhibit both strategies. We investigated the clade identity of symbionts in soft coral hosts (Eilat, Red Sea) in relation to their hosts' mode of symbiont acquisition. We found for the first time that all hosts using horizontal transmission harbored symbionts belonging to Clade C while those with vertical transmission uniquely harbored symbionts from Clade A. The latter, capable of coping with a wide array of environmental conditions, evolved to be optimal vertically transmitted symbionts. The limitation of Clade A symbionts to hosts with vertical transmission suggests a coevo-lution of the hosts and symbionts. Clade C symbionts, characterized by large sub-clade variability, are found in corals with horizontal transmission and, most probably, each of its genotypes exhibits a more specialized set of physiological capabilities.
机译:共生协会在陆地和海洋环境中无处不在,具有重要的生态意义。共生关系的发作在协会之间有所不同。共生体可以从寄主的父母垂直传播到后代,也可以从周围环境中水平获取,每一代新的寄主。这项研究的主题是藻-藻共生体,同时显示了两种策略。我们研究了软珊瑚宿主(埃拉特,红海)中共生体的进化枝身份,与它们的宿主共生体获取方式有关。我们首次发现,所有使用水平传播的宿主都具有属于进化枝C的共生体,而那些使用垂直传播的宿主具有来自进化枝A的独特共生体。后者能够应对多种环境条件,因此进化为最佳的垂直传播共生体。进化枝A共生体对垂直传播宿主的局限性提示宿主和共生体共进化。进化枝C共生体具有大的进化枝可变性,其特征是在水平传播的珊瑚中发现,并且很可能每种基因型都表现出更为专业的生理能力。

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