Rapid diversification underlying the global dominance of a cosmopolitan phytoplankton.
Rapid diversification underlying the global dominance of a cosmopolitan phytoplankton.
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DOI：
10.1038/s41396-023-01365-5
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发表时间：
2023-04
期刊：
影响因子：
11
通讯作者：
Filatov, Dmitry
中科院分区：
文献类型：
--
作者：
Bendif, El Mahdi;Probert, Ian;Archontikis, Odysseas A.;Young, Jeremy R.;Beaufort, Luc;Rickaby, Rosalind E.;Filatov, Dmitry
海洋浮游植物在全球生态系统中发挥着重要作用，其生物量由数量有限的世界性关键物种驱动。最近的研究表明，这些浮游植物中有许多是由兄弟物种组成的复合体，但对其形成的进化过程知之甚少。Gephyrocapsa huxleyi是一种分布广泛、数量丰富的单细胞海洋浮游藻类，其产生的钙化鳞片（球壳）通过固定无机碳对全球生态地球化学循环产生重要影响。该物种由不同程度的颗石钙化所定义的形态型组成，其进化生态学尚不清楚。在这里，我们报告了一个综合的形态，生态和基因组调查全球分布的G。huxleyi菌株重建形态型之间的进化关系，与他们的栖息地。而G. huxleyi一直被认为是一个单一的世界性种，我们的分析表明，它已经进化到包括至少三个不同的种，这使得我们正式修订了G.赫胥黎情结此外，第一次物种形成事件发生在末次间冰期（~140 ka）之前，而第二次则发生在这次间冰期。然后，在最近的冰盖扩张的最后一个冰川期发生进一步快速多样化，并建立了形态型作为优势种群的环境渐变。这些结果表明，冰川周期动力学的海洋盆地的隔离和隔离的海洋前沿作为外在的驱动程序的微进化辐射现存的海洋浮游植物。
Marine phytoplankton play important roles in the global ecosystem, with a limited number of cosmopolitan keystone species driving their biomass. Recent studies have revealed that many of these phytoplankton are complexes composed of sibling species, but little is known about the evolutionary processes underlying their formation. Gephyrocapsa huxleyi, a widely distributed and abundant unicellular marine planktonic algae, produces calcified scales (coccoliths), thereby significantly affects global biogeochemical cycles via sequestration of inorganic carbon. This species is composed of morphotypes defined by differing degrees of coccolith calcification, the evolutionary ecology of which remains unclear. Here, we report an integrated morphological, ecological and genomic survey across globally distributed G. huxleyi strains to reconstruct evolutionary relationships between morphotypes in relation to their habitats. While G. huxleyi has been considered a single cosmopolitan species, our analyses demonstrate that it has evolved to comprise at least three distinct species, which led us to formally revise the taxonomy of the G. huxleyi complex. Moreover, the first speciation event occurred before the onset of the last interglacial period (~140 ka), while the second followed during this interglacial. Then, further rapid diversifications occurred during the most recent ice-sheet expansion of the last glacial period and established morphotypes as dominant populations across environmental clines. These results suggest that glacial-cycle dynamics contributed to the isolation of ocean basins and the segregations of oceans fronts as extrinsic drivers of micro-evolutionary radiations in extant marine phytoplankton.
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DOI：
10.1073/pnas.0709381104
发表时间：
2007-12-18
影响因子：
11.1
作者：
Finkel, Z. V.;Sebbo, J.;Falkowski, P. G.
通讯作者：
Falkowski, P. G.
DOI：
10.1073/pnas.1001380107
发表时间：
2010-07-20
影响因子：
11.1
作者：
Casteleyn, Griet;Leliaert, Frederik;Vyverman, Wim
通讯作者：
Vyverman, Wim
影响因子：
1.9
作者：
Andruleit, Harald;Lueckge, Andreas;Staeger, Sabine
通讯作者：
Staeger, Sabine
影响因子：
1.9
作者：
Flores, Jose-Abel;Colmenero-Hidalgo, Elena;Rodrigues, Teresa
通讯作者：
Rodrigues, Teresa
影响因子：
10.7
作者：
Bryant, D;Moulton, V
通讯作者：
Moulton, V