Evolution of coastal forests based on a full set of mangrove genomes
Evolution of coastal forests based on a full set of mangrove genomes
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DOI：
10.1038/s41559-022-01744-9
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发表时间：
2022-04-28
影响因子：
16.8
通讯作者：
Shi, Suhua
中科院分区：
文献类型：
--
作者：
He, Ziwen;Feng, Xiao;Shi, Suhua
基因组研究现在准备探索整个物种群落。类似于70种木本植物的锚沿海生态系统的热带地区，统称为红树林，特别适合这种探索。在这项研究中，我们对32种红树林的全基因组进行了重新测序，并将其与其他30个物种的其他序列相结合，这些物种几乎包括全球所有的红树林。这些社区范围的基因组数据将对生态学、进化和生物多样性研究有价值。虽然数据显示有27个红树林的独立起源，但总的物种起源表明，即使在物种形成活跃的沿海地区，物种数量也只略有增加，这表明红树林灭绝是常见的。对常见灭绝的一个可能解释是地质记录中记录的海平面频繁上升和福尔斯（SLR和SLF）。事实上，种群规模（N）非常小的物种的接近灭绝往往发生在快速SLR期间，几乎所有红树林的全基因组杂合性揭示了这一点。氮的减少可能会进一步加剧种群的分裂和随后有害突变的积累，从而推动红树林更接近灭绝。最重要的是，人类对这些红树林栖息地的侵占将加剧下一次SLR的影响，可能不可逆转地改变热带海岸的生态系统。锚在热带沿海生态系统的木本植物，统称为红树林，约70种，特别适合这种探索。在这项研究中，我们对32种红树林的全基因组进行了重新测序，并将其与其他30个物种的其他序列相结合，这些物种几乎包括全球所有的红树林。这些社区范围的基因组数据将对生态学、进化和生物多样性研究有价值。虽然数据显示有27个红树林的独立起源，但总的物种起源表明，即使在物种形成活跃的沿海地区，物种数量也只略有增加，这表明红树林灭绝是常见的。对常见灭绝的一个可能解释是地质记录中记录的海平面频繁上升和福尔斯（SLR和SLF）。事实上，种群规模（N）非常小的物种的接近灭绝往往发生在快速SLR期间，几乎所有红树林的全基因组杂合性揭示了这一点。氮的减少可能会进一步加剧种群的分裂和随后有害突变的积累，从而推动红树林更接近灭绝。至关重要的是，人类对这些红树林栖息地的侵占将加剧下一次SLR的影响，可能不可逆转地改变热带海岸的生态系统。
Genomic studies are now poised to explore whole communities of species. The similar to 70 species of woody plants that anchor the coastal ecosystems of the tropics, collectively referred to as mangroves, are particularly suited to this exploration. In this study, we de novo sequenced the whole genomes of 32 mangroves, which we combined with other sequences of 30 additional species, comprising almost all mangroves globally. These community-wide genomic data will be valuable for ecology, evolution and biodiversity research. While the data revealed 27 independent origins of mangroves, the total phylogeny shows only modest increases in species number, even in coastal areas of active speciation, suggesting that mangrove extinction is common. A possible explanation for common extinction is the frequent sea-level rises and falls (SLRs and SLFs) documented in the geological record. Indeed, near-extinctions of species with extremely small population size (N) often happened during periods of rapid SLR, as revealed by the genome-wide heterozygosity of almost all mangroves. Reduction in N has possibly been further compounded by population fragmentation and the subsequent accumulation of deleterious mutations, thus pushing mangroves even closer to extinction. Crucially, the impact of the next SLR will be exacerbated by human encroachment into these mangrove habitats, potentially altering the ecosystems of tropical coasts irreversibly.Genomic studies are now poised to explore whole communities of species. The -70 species of woody plants that anchor the coastal ecosystems of the tropics, collectively referred to as mangroves, are particularly suited to this exploration. In this study, we de novo sequenced the whole genomes of 32 mangroves, which we combined with other sequences of 30 additional species, comprising almost all mangroves globally. These community-wide genomic data will be valuable for ecology, evolution and biodiversity research. While the data revealed 27 independent origins of mangroves, the total phylogeny shows only modest increases in species number, even in coastal areas of active speciation, suggesting that mangrove extinction is common. A possible explanation for common extinction is the frequent sea-level rises and falls (SLRs and SLFs) documented in the geological record. Indeed, near-extinctions of species with extremely small population size (N) often happened during periods of rapid SLR, as revealed by the genome-wide heterozygosity of almost all mangroves. Reduction in N has possibly been further compounded by population fragmentation and the subsequent accumulation of deleterious mutations, thus pushing mangroves even closer to extinction. Crucially, the impact of the next SLR will be exacerbated by human encroachment into these mangrove habitats, potentially altering the ecosystems of tropical coasts irreversibly.