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首页> 外文期刊>The ISME journal emultidisciplinary journal of microbial ecology >Divergent symbiont communities determine the physiology and nutrition of a reef coral across a light-availability gradient
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Divergent symbiont communities determine the physiology and nutrition of a reef coral across a light-availability gradient

机译：不同的Symbiont社区确定光可用性梯度礁珊瑚的生理学和营养

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摘要

Reef corals are mixotrophic organisms relying on symbiont-derived photoautotrophy and water column heterotrophy. Coral endosymbionts (Family: Symbiodiniaceae), while typically considered mutualists, display a range of species-specific and environmentally mediated opportunism in their interactions with coral hosts, potentially requiring corals to rely more on heterotrophy to avoid declines in performance. To test the influence of symbiont communities on coral physiology (tissue biomass, symbiont density, photopigmentation) and nutrition (delta C-13, delta N-15), we sampled Montipora capitata colonies dominated by a specialist symbiont Cladocopium spp. or a putative opportunist Durusdinium glynnii (hereafter, C- or D-colonies) from Kane'ohe Bay, Hawai'i, across gradients in photosynthetically active radiation (PAR) during summer and winter. We report for the first time that isotope values of reef corals are influenced by Symbiodiniaceae communities, indicative of different autotrophic capacities among symbiont species. D-colonies had on average 56% higher symbiont densities, but lower photopigments per symbiont cell and consistently lower delta C-13 values in host and symbiont tissues; this pattern in isotope values is consistent with lower symbiont carbon assimilation and translocation to the host. Neither C- nor D-colonies showed signs of greater heterotrophy or nutritional plasticity; instead changes in delta C-13 values were driven by PAR availability and photoacclimation attributes that differed between symbiont communities. Together, these results reveal Symbiodiniaceae functional diversity produces distinct holobionts with different capacities for autotrophic nutrition, and energy tradeoffs from associating with opportunist symbionts are not met with increased heterotrophy.
机译：Reef珊瑚是依赖于Symbiont衍生的光摄影和水柱异营养学的混合营养生物。珊瑚endosymbionts（家族：Symbidiniaceae），而通常认为相互主义者，在与珊瑚宿主的相互作用中显示一系列特定的特定和环境介导的机会主义，可能需要珊瑚依赖于异营性以避免性能下降。为了测试Symbiont社区对珊瑚生理学的影响（组织生物量，Symbiont密度，皮肤下沉积）和营养（Delta C-13，Delta N-15），我们采样由专业Symbiont Cladocopium SPP主导的Montipora Capitata菌落。或者在夏季和冬季的光合作用辐射（PAR）的梯度中，来自Kane'ohe Bay的推定机会主义者·杜兰尼尼·甘蓝（以下，C-或D-Colonies）。我们首次报告礁珊瑚的同位素值受Symbiodiniaceae群落的影响，这表明Symbiont物种之间的不同自养能力。 D-Colonies平均较高56％的Symbiont密度，但每种Symbiont细胞的光处理较低，并且始终如一的宿主和Symbiont组织中的Delta C-13值;同位素值中的这种模式与较低的Symbiont碳同化和易位到主机一致。既不是c-也不是d-colonies显示出更大的异养或营养塑性的迹象;相反，Delta C-13值的变化是由Symbiont社区之间不同的Par可用性和PhotoAcclimation属性驱动的。这些结果揭示了Symbiodiniaceae功能多样性，产生不同的自养营养能力的不同能力，并且从与机会主义者共享者相关的能量权衡并没有增加异步。

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