Voolstra Christian R, Hume Benjamin C C, Armstrong Eric J, Mitushasi Guinther, Porro Barbara, Oury Nicolas, Agostini Sylvain, Boissin Emilie, Poulain Julie, Carradec Quentin, Paz-García David A, Zoccola Didier, Magalon Hélène, Moulin Clémentine, Bourdin Guillaume, Iwankow Guillaume, Romac Sarah, Banaigs Bernard, Boss Emmanuel, Bowler Chris, de Vargas Colomban, Douville Eric, Flores Michel, Furla Paola, Galand Pierre E, Gilson Eric, Lombard Fabien, Pesant Stéphane, Reynaud Stéphanie, Sullivan Matthew B, Sunagawa Shinichi, Thomas Olivier P, Troublé Romain, Thurber Rebecca Vega, Wincker Patrick, Planes Serge, Allemand Denis, Forcioli Didier
Department of Biology, University of Konstanz, 78457, Konstanz, Germany.
PSL Research University, EPHE, CNRS, Université de Perpignan, Perpignan, France.
NPJ Biodivers. 2023 Jul 7;2(1):15. doi: 10.1038/s44185-023-00020-8.
Tropical coral reefs are among the most affected ecosystems by climate change and face increasing loss in the coming decades. Effective conservation strategies that maximize ecosystem resilience must be informed by the accurate characterization of extant genetic diversity and population structure together with an understanding of the adaptive potential of keystone species. Here we analyzed samples from the Tara Pacific Expedition (2016-2018) that completed an 18,000 km longitudinal transect of the Pacific Ocean sampling three widespread corals-Pocillopora meandrina, Porites lobata, and Millepora cf. platyphylla-across 33 sites from 11 islands. Using deep metagenomic sequencing of 269 colonies in conjunction with morphological analyses and climate variability data, we can show that despite a targeted sampling the transect encompasses multiple cryptic species. These species exhibit disparate biogeographic patterns and, most importantly, distinct evolutionary patterns in identical environmental regimes. Our findings demonstrate on a basin scale that evolutionary trajectories are species-specific and can only in part be predicted from the environment. This highlights that conservation strategies must integrate multi-species investigations to discern the distinct genomic footprints shaped by selection as well as the genetic potential for adaptive change.
热带珊瑚礁是受气候变化影响最严重的生态系统之一，在未来几十年面临着日益增加的损失。有效的保护策略若要最大限度地提高生态系统恢复力，必须基于对现存遗传多样性和种群结构的准确描述，以及对关键物种适应潜力的理解。在此，我们分析了塔拉太平洋探险队（2016 - 2018年）采集的样本，该探险队完成了一次长达18000公里的太平洋纵向断面调查，在来自11个岛屿的33个地点对三种分布广泛的珊瑚——鹿角杯形珊瑚、扁脑珊瑚和多孔螅属扁平多孔螅进行了采样。通过对269个珊瑚群落进行深度宏基因组测序，并结合形态分析和气候变率数据，我们可以证明，尽管是有针对性的采样，该断面仍包含多个隐存种。这些物种呈现出不同的生物地理模式，最重要的是，在相同的环境条件下具有独特的进化模式。我们的研究结果表明，在一个盆地尺度上，进化轨迹是物种特异性的，只能部分地从环境中预测。这突出表明，保护策略必须整合多物种调查，以识别由选择塑造的独特基因组印记以及适应性变化的遗传潜力。
