黑珊瑚（Antipatharia：Hexacorallia）的热敏感性：马达加斯加热波动地区的同域物种与异域同属物种之间的比较,Science of the Total Environment

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黑珊瑚（Antipatharia：Hexacorallia）的热敏感性：马达加斯加热波动地区的同域物种与异域同属物种之间的比较
Science of the Total Environment ( IF 8.2 ) Pub Date : 2023-11-04 , DOI: 10.1016/j.scitotenv.2023.168311
Mathilde Godefroid ₁ , Mathilde Vandendriessche ₁ , Gildas Georges Boleslas Todinanahary ₂ , Ignace Ransquin ₃ , Philippe Dubois ₁

Affiliation

这项研究调查了影响 Antipatharian 热敏感性的因素，Antipatharian 是一种其成员在所有海洋中形成密集聚集体的分类单元，具有高度的生物多样性。首先，我们使用急性升温方法测试了图利亚拉大礁（马达加斯加）的五个同域物种（、、 cf. 和 cf.）的热响应。然后我们比较了这五个物种的耗氧量热性能曲线（TPC）。结果表明，系统发育本身并不能解释热敏感性的差异（Antipathidae 与 Myriopathidae）。相反，形态（支化与非支化）似乎是一个关键因素，非支化物种（. cf. , . cf. ）比支化物种（和）更能耐受热应力。一些假设可以解释不同形态的热耐受性的这些变化，例如组织厚度、表面/体积比或传质效率。其次，我们将马达加斯加的 TPC 与之前从加那利群岛和法属波利尼西亚的同类产品中获得的 TPC 进行了比较。这表明前者比后者具有更高的耐热性。有人提出，与法属波利尼西亚相比，这与这两个地点较高的年气温变化（但不是日变化）有关。结论是，antipatharians 的热敏感性与影响其生理学的形态和热历史有关。科水平的系统发育在解释反噬者热敏感性差异方面发挥的作用不太重要。

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Thermal sensitivity of black corals (Antipatharia: Hexacorallia): Comparisons between sympatric species from a thermally fluctuating site in Madagascar and between allopatric congenerics

This study investigated factors shaping the thermal sensitivity in antipatharians, a taxon whose members form dense aggregations in all oceans, harbouring a high biodiversity. First, we tested the thermal responses of five sympatric species (, , cf. , and cf. ) from the Great Reef of Toliara (Madagascar), using an acute ramping methodology. We then compared the thermal performance curves (TPCs) for oxygen consumption of these five species. Results indicated that phylogeny alone does not explain differences in thermal sensitivity (Antipathidae vs. Myriopathidae). On the contrary, morphology (branched vs. unbranched) appeared as a key factor, with unbranched species (. cf. , . cf. ) being more tolerant to thermal stress than branched ones ( and ). Several hypothesis could explain these variations in thermal tolerance across morphology, such as tissue thickness, surface/volume ratio or mass-transfer efficiency. Secondly, we compared the TPC of from Madagascar with those previously obtained in congenerics from the Canary Islands and French Polynesia. This revealed a higher thermal tolerance in the two former than in the latter. It is proposed that it is linked to higher annual temperature variability (but not daily variability) in these two sites compared to French Polynesia. It is concluded that thermal sensitivity in antipatharians is linked to their morphology influencing their physiology and to their thermal history. Phylogeny at the family level plays a less important role in explaining differences in thermal sensitivity in antipatharians.

更新日期：2023-11-04

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