How do cold-adapted plants respond to climatic cycles? interglacial expansion explains current distribution and genomic diversity in Primula farinosa L.

Understanding the effects of past climatic fluctuations on the distribution and population-size dynamics of cold-adapted species is essential for predicting their responses to ongoing global climate change. In spite of the heterogeneity of cold-adapted species, two main contrasting hypotheses have been proposed to explain their responses to Late Quaternary glacial cycles, namely, the interglacial contraction versus the interglacial expansion hypotheses. Here, we use the cold-adapted plant Primula farinosa to test two demographic models under each of the two alternative hypotheses and a fifth, null model. We first approximate the time and extent of demographic contractions and expansions during the Late Quaternary by projecting species distribution models across the last 72 ka. We also generate genome-wide sequence data using a Reduced Representation Library approach to reconstruct the spatial structure, genetic diversity, and phylogenetic relationships of lineages within P. farinosa. Fi...

解析过往气候波动对耐寒物种分布与种群动态的影响，对预测其应对当前全球气候变化的响应至关重要。尽管耐寒物种存在生态异质性，学界已提出两种核心对立假说以解释其对晚第四纪冰期旋回的响应，即间冰期收缩假说与间冰期扩张假说。本研究以耐寒植物球花报春（Primula farinosa）为研究材料，针对上述两种对立假说分别推导的种群动态模型，以及第五种零模型开展检验。我们首先通过在过去72千年（ka）间投射物种分布模型，估算晚第四纪时期种群收缩与扩张的时间与规模。此外，本研究采用简化基因组文库（Reduced Representation Library）技术获取全基因组序列数据，以重构球花报春种群内谱系的空间结构、遗传多样性及系统发育关系。Fi...