Differential strategies developed by two light-dependent scleractinian corals to extend their vertical range to mesophotic depths

IF 2.7 2区 生物学 Q1 MARINE & FRESHWATER BIOLOGY
Gonzalo Pérez-Rosales, Héloïse Rouzé, Michel Pichon, Pim Bongaerts, Nelly Bregere, Jérémy Carlot, Valeriano Parravicini, Laetitia Hédouin
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Abstract

Mesophotic coral ecosystems are characterised by the presence of photosynthetic scleractinian corals despite the decreasing amounts of light available with depth. To better understand physiological strategies across a broad depth gradient, we studied the biological trait responses of Pocillopora cf. verrucosa from 6 to 60 m depth and Pachyseris “speciosa” spp. from 20 to 90 m depth at four islands of French Polynesia. Specifically, we characterised associated Symbiodiniaceae communities, photophysiological traits (Symbiodiniaceae density and chlorophyll concentrations), micro-morphology and trophic plasticity (autotrophy vs heterotrophy inferred from stable isotopes). Our results showed that both taxa can live at mesophotic depths without significant genetic structuring in their generic Symbiodiniaceae communities, mainly composed of Cladocopium and Durusdinium. Yet, the prevalence of Symbiodiniaceae ITS2 profiles revealed location-based variations that sometimes interact with depth and highlight putative shallow- or depth-tolerant taxa. For both taxa, symbiont density and chlorophyll pigment concentrations increased with increasing depth. We also found a change in their skeletal micro-morphology with an increase in the inter-corallite distance for Pocillopora cf. verrucosa and a decrease in the height of septa for Pachyseris “speciosa” spp. with depth. Finally, we found no isotopic evidence of switching to a more heterotrophic diet as their primary energy source, although host–tissue δ13C ratios became more negative with depth in both corals. Overall, our findings show similarity (across the two species) and species-specific strategies (biological trait patterns with increasing depth) underlying the capacity of symbiotic scleractinian corals to live in low-light environments.

Abstract Image

两种依赖光照的硬骨鱼类珊瑚为将其垂直分布范围扩展到中深海而制定的不同策略
中生代珊瑚生态系统的特点是存在光合作用的硬骨珊瑚,尽管可利用的光量随着深度的增加而减少。为了更好地了解广阔深度梯度上的生理策略,我们研究了法属波利尼西亚四个岛屿上深度从 6 米到 60 米的 Pocillopora cf. verrucosa 和深度从 20 米到 90 米的 Pachyseris "speciosa" spp.具体而言,我们研究了相关的共生藻群落、光生理学特征(共生藻密度和叶绿素浓度)、微形态和营养可塑性(根据稳定同位素推断的自养与异养)。我们的研究结果表明,这两个类群都能生活在中深海中,其一般的 Symbiodiniaceae 群落(主要由 Cladocopium 和 Durusdinium 组成)没有明显的遗传结构。然而,Symbiodiniaceae ITS2 图谱的普遍性揭示了基于位置的变化,这种变化有时会与深度相互作用,并突出了潜在的耐浅或耐深类群。这两个类群的共生体密度和叶绿素色素浓度都随着深度的增加而增加。我们还发现,随着深度的增加,它们的骨骼微形态也发生了变化,Pocillopora cf. verrucosa 的栅孔间距增加,而 Pachyseris "speciosa" spp.最后,尽管两种珊瑚的宿主组织δ13C 比率随着深度的增加而呈负值,但我们没有发现任何同位素证据表明它们的主要能量来源已转向更多的异养生物食物。总之,我们的研究结果表明,共生硬骨鱼类珊瑚在低光照环境中生活的能力具有相似性(在两个物种之间)和物种特有的策略(随深度增加的生物特征模式)。
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来源期刊
Coral Reefs
Coral Reefs 生物-海洋与淡水生物学
CiteScore
6.80
自引率
11.40%
发文量
111
审稿时长
4-8 weeks
期刊介绍: Coral Reefs, the Journal of the International Coral Reef Society, presents multidisciplinary literature across the broad fields of reef studies, publishing analytical and theoretical papers on both modern and ancient reefs. These encourage the search for theories about reef structure and dynamics, and the use of experimentation, modeling, quantification and the applied sciences. Coverage includes such subject areas as population dynamics; community ecology of reef organisms; energy and nutrient flows; biogeochemical cycles; physiology of calcification; reef responses to natural and anthropogenic influences; stress markers in reef organisms; behavioural ecology; sedimentology; diagenesis; reef structure and morphology; evolutionary ecology of the reef biota; palaeoceanography of coral reefs and coral islands; reef management and its underlying disciplines; molecular biology and genetics of coral; aetiology of disease in reef-related organisms; reef responses to global change, and more.
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