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首页> 外文期刊>Coral reefs: journal of the International Society for Reef Studies >Host tolerance, not symbiont tolerance, determines the distribution of coral species in relation to their environment at a Central Pacific atoll
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Host tolerance, not symbiont tolerance, determines the distribution of coral species in relation to their environment at a Central Pacific atoll

机译：宿主耐受性而非共生体耐受性决定了中部太平洋环礁上珊瑚物种相对于其环境的分布

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Tolerance of environmental variables differs between corals and their dinoflagellate symbionts (Symbiodinium spp.), controlling the holobiont's (host and symbiont combined) resilience to environmental stress. However, the ecological role that environmental variables play in holobiont distribution remains poorly understood. We compared the drivers of symbiont and coral species distributions at Palmyra Atoll, a location with a range of reef environments from low to high sediment concentrations (1-52 g dry weight m ~(-2) day ~(-1)). We observed uniform holobiont partnerships across the atoll (e. g. Montipora spp. with Symbiodinium type C15 at all sites). Multivariate analysis revealed that field-based estimates of settling sediment predominantly explained the spatial variation of coral species among sites (P < 0.01). However, none of the environmental variables measured (sedimentation, temperature, chlorophyll concentration, salinity) affected symbiont distribution. The discord between environmental variables and symbiont distributions suggests that the symbionts are physiologically tolerant of the variable environmental regime across this location and that the distribution of different host-symbiont combinations present is largely dependent on coral rather than Symbiodinium physiology. The data highlight the importance of host tolerance to environmental stressors, which should be considered simultaneously with symbiont sensitivity when considering the impact of variations in environmental conditions on coral communities.
机译：珊瑚及其鞭毛共生体（Symbiodinium spp。）之间对环境变量的容忍度有所不同，从而控制了整个整体（对宿主和共生体的共生性）对环境压力的适应力。然而，人们对环境变量在整体分布中所起的生态作用仍然知之甚少。我们比较了巴尔米拉环礁共生菌和珊瑚物种分布的驱动因素，该地区的礁石环境范围从低到高的沉积物浓度（1-52 g干重m〜（-2）天〜（-1））。我们在整个环礁上观察到了统一的整体类伙伴关系（例如，在所有地点，Montipora spp。与Symbiodinium类型为C15）。多变量分析表明，基于实地的沉积物估算主要解释了地点之间珊瑚物种的空间变化（P <0.01）。但是，所测量的环境变量（沉降，温度，叶绿素浓度，盐度）均不影响共生体分布。环境变量和共生体分布之间的矛盾表明，共生体在该位置对可变环境机制具有生理耐受性，并且存在的不同宿主共生体组合的分布在很大程度上取决于珊瑚，而不是共生体生理。数据强调了宿主对环境胁迫的耐受性的重要性，在考虑环境条件变化对珊瑚群落的影响时，应同时考虑共生体敏感性。

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