Institut de Biologie de l'Ecole Normale Supérieure (IBENS), CNRS, INSERM, Université PSL, Paris, France.
US Military HIV Research Program, WRAIR, Silver Spring, MD, USA.
Nat Ecol Evol. 2018 Nov;2(11):1715-1723. doi: 10.1038/s41559-018-0691-3. Epub 2018 Oct 22.
Diatoms are one of the most abundant and diverse groups of phytoplankton and play a major role in marine ecosystems and the Earth's biogeochemical cycles. Here we combine DNA metabarcoding data from the Tara Oceans expedition with palaeoenvironmental data and phylogenetic models of diversification to analyse the diversity dynamics of marine diatoms. We reveal a primary effect of variation in carbon dioxide partial pressure (pCO) on early diatom diversification, followed by a major burst of diversification in the late Eocene epoch, after which diversification is chiefly affected by sea level, an influx of silica availability and competition with other planktonic groups. Our results demonstrate a remarkable heterogeneity of diversification dynamics across diatoms and suggest that a changing climate will favour some clades at the expense of others.
硅藻是浮游植物中最丰富和最多样化的群体之一，在海洋生态系统和地球的生物地球化学循环中起着重要作用。在这里，我们结合 Tara Oceans 考察的 DNA 代谢组学数据以及多样化的古环境数据和系统发育模型，来分析海洋硅藻的多样性动态。我们揭示了二氧化碳分压（pCO）变化对早期硅藻多样化的主要影响，随后在晚始新世出现了多样化的大爆发，此后多样化主要受到海平面、硅可用性的增加以及与其他浮游生物群的竞争的影响。我们的研究结果表明硅藻的多样化动态具有显著的异质性，并表明气候变化将有利于某些进化枝，而使其他进化枝处于不利地位。
