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Occurrence of apomictic conspecifics and ecological preferences rather than colonization history govern the geographic distribution of sexual Potentilla puberula.
Ecology and Evolution ( IF 2.3 ) Pub Date : 2020-06-22 , DOI: 10.1002/ece3.6455 Flavia Domizia Nardi 1, 2 , Karl Hülber 3 , Dietmar Moser 3 , Henar Alonso-Marcos 1, 3 , Andreas Tribsch 2 , Christoph Dobeš 1
Ecology and Evolution ( IF 2.3 ) Pub Date : 2020-06-22 , DOI: 10.1002/ece3.6455 Flavia Domizia Nardi 1, 2 , Karl Hülber 3 , Dietmar Moser 3 , Henar Alonso-Marcos 1, 3 , Andreas Tribsch 2 , Christoph Dobeš 1
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The geographic distribution of sexual‐apomictic taxa (i.e., comprising individuals usually reproducing either sexually or asexually via seeds) is traditionally thought to be driven by their ecological preferences and colonization histories. Where sexuals and apomicts get into contact with each other, competitive and reproductive interactions can interfere with these factors, an aspect which hitherto received little attention in biogeographic studies. We disentangled and quantified the relative effects of the three factors on the distribution of tetraploid sexuals in Potentilla puberula in a latitudinal transect through the Eastern European Alps, in which they are codistributed with penta‐, hepta‐, and octoploid apomictic conspecifics. Effects were explored by means of binomial generalized linear regression models combining a single with a multiple predictor approach. Postglacial colonization history was inferred from population genetic variation (AFLPs and cpDNA) and quantified using a cost distance metric. The study was based on 235 populations, which were purely sexual, purely apomictic, or of mixed reproductive mode. The occurrence of apomicts explained most of the variation in the distribution of sexuals (31%). Specifically, the presence of sexual tetraploids was negatively related to the presence of each of the three apomictic cytotypes. Effects of ecological preferences were substantial too (7% and 12% of the total variation explained by ecological preferences alone, or jointly with apomicts’ occurrence, respectively). In contrast, colonization history had negligible effects on the occurrence of sexuals. Taken together, our results highlight the potentially high impact of reproductive interactions on the geographic distribution of sexual and apomictic conspecifics and that resultant mutual exclusion interrelates to ecological differentiation, a situation potentially promoting their local coexistence.
中文翻译：
有性生殖委陵菜的地理分布是由无融合生殖同种体的出现和生态偏好而不是殖民历史决定的。
有性无融合生殖类群（即，通常通过种子进行有性或无性繁殖的个体组成）的地理分布传统上被认为是由其生态偏好和殖民历史驱动的。当有性生殖和无融合生殖彼此接触时，竞争和生殖相互作用会干扰这些因素，这一方面迄今为止在生物地理学研究中很少受到关注。我们解开了并量化了这三个因素对穿过东欧阿尔卑斯山纬度样带的毛委陵菜四倍体有性生殖分布的相对影响，其中它们与五倍体、七倍体和八倍体无性生殖同种共分布。通过将单一预测方法与多重预测方法相结合的二项式广义线性回归模型来探讨效果。冰河后殖民历史是根据种群遗传变异（AFLP 和 cpDNA）推断出来的，并使用成本距离度量进行量化。该研究基于235个种群，这些种群是纯有性生殖、纯无性生殖或混合生殖模式。无融合生殖体的出现解释了两性分布差异的大部分（31%）。具体而言，有性四倍体的存在与三种无融合生殖细胞型中每一种的存在负相关。生态偏好的影响也很大（总变异的 7% 和 12% 分别由生态偏好单独解释，或与无融合生殖体的出现共同解释）。相比之下，殖民历史对有性生殖的影响可以忽略不计。 总而言之，我们的结果强调了生殖相互作用对有性生殖和无性生殖同种的地理分布具有潜在的巨大影响，并且由此产生的相互排斥与生态分化相互关联，这种情况可能促进它们在当地的共存。
更新日期：2020-07-30
中文翻译：
有性生殖委陵菜的地理分布是由无融合生殖同种体的出现和生态偏好而不是殖民历史决定的。
有性无融合生殖类群（即，通常通过种子进行有性或无性繁殖的个体组成）的地理分布传统上被认为是由其生态偏好和殖民历史驱动的。当有性生殖和无融合生殖彼此接触时，竞争和生殖相互作用会干扰这些因素，这一方面迄今为止在生物地理学研究中很少受到关注。我们解开了并量化了这三个因素对穿过东欧阿尔卑斯山纬度样带的毛委陵菜四倍体有性生殖分布的相对影响，其中它们与五倍体、七倍体和八倍体无性生殖同种共分布。通过将单一预测方法与多重预测方法相结合的二项式广义线性回归模型来探讨效果。冰河后殖民历史是根据种群遗传变异（AFLP 和 cpDNA）推断出来的，并使用成本距离度量进行量化。该研究基于235个种群，这些种群是纯有性生殖、纯无性生殖或混合生殖模式。无融合生殖体的出现解释了两性分布差异的大部分（31%）。具体而言，有性四倍体的存在与三种无融合生殖细胞型中每一种的存在负相关。生态偏好的影响也很大（总变异的 7% 和 12% 分别由生态偏好单独解释，或与无融合生殖体的出现共同解释）。相比之下，殖民历史对有性生殖的影响可以忽略不计。 总而言之，我们的结果强调了生殖相互作用对有性生殖和无性生殖同种的地理分布具有潜在的巨大影响，并且由此产生的相互排斥与生态分化相互关联，这种情况可能促进它们在当地的共存。
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