Lin Ya-Ping, Lu Cheng-Yueh, Lee Cheng-Ruei
Institute of Ecology and Evolutionary Biology, National Taiwan University, Taipei, Taiwan.
Institute of Plant Biology, National Taiwan University, Taipei, Taiwan.
AoB Plants. 2020 Mar 12;12(2):plaa012. doi: 10.1093/aobpla/plaa012. eCollection 2020 Apr.
Under intraspecific differentiation driven by differential climatic adaptation, it may be expected that intraspecific genetic groups occur at distinct environments. Populations occupying different niches may therefore differ in their ability to cope with climate change. Here, we addressed this hypothesis with a wild tomato, . This species is distributed from the west side of Andes to the coastal region in Peru and Ecuador and occupies a wide environmental diversity. This environmental diversity is related to the genetic structure of the species providing an ideal material to investigate the isolation by environment hypothesis. While previous hypothesis stated that originated from northern Peru and migrated northwards and southwards, our results support that originated from Ecuador and expanded to northern and southern Peru, and during this process, the niche space of became more associated with cold and drought. We further predicted its fate under anthropogenic climate change. According to our predictions, the northern group will maintain its current extent or even expand to the entire western region of Ecuador. In contrast, we predicted low habitat suitability for the southern group which could potentially lead to the shrinkage of its distribution. In conclusion, we revealed the distinct fates among the differentiated populations driven by environment under global warming conditions.
在由差异气候适应驱动的种内分化下，可以预期种内遗传群体出现在不同的环境中。因此，占据不同生态位的种群应对气候变化的能力可能存在差异。在这里，我们用一种野生番茄来验证这一假设。该物种分布于安第斯山脉西侧至秘鲁和厄瓜多尔的沿海地区，占据了广泛的环境多样性。这种环境多样性与该物种的遗传结构相关，为研究环境隔离假说提供了理想材料。虽然先前的假说认为该物种起源于秘鲁北部并向北和向南迁移，但我们的结果支持该物种起源于厄瓜多尔并扩展到秘鲁北部和南部，在此过程中，该物种的生态位空间与寒冷和干旱的关联度更高。我们进一步预测了其在人为气候变化下的命运。根据我们的预测，北部群体将维持其当前范围，甚至扩展到厄瓜多尔的整个西部地区。相比之下，我们预测南部群体的栖息地适宜性较低，这可能导致其分布范围缩小。总之，我们揭示了在全球变暖条件下，由环境驱动的分化种群之间的不同命运。
