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Limited pollen flow and high selfing rates toward geographic range limit in an Atlantic forest bromeliad

机译：花粉流动受限且自交率高，对大西洋菠萝科的地理范围限制

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摘要

Bromeliaceae is a Neotropical family that evolved ecological key innovations in association with extensive adaptive radiation. Its species present a variety of different mating system strategies varying within and among species, within genera and subfamilies. Also, species with a wide geographical range can display large variation in mating system, reproductive success and genetic diversity. Here we combined data from hand pollinations and genetic analysis to assess outcomes of contemporary gene flow and mating system variation at the range edge of Vriesea gigantea. Results from pollen germination rates showed that this species is cryptically self-incompatible. Hand-pollination experiments and genetic analysis of progeny arrays revealed that V. gigantea has a mixed mating system, with high selling rates (s = 0.612), and high inbreeding coefficient (F= 0.372). Inbreeding in V. gigantea at southern edge of its distribution range was caused by high levels of selfing rather than by mating among relatives. Moreover, strong pollen pool genetic structure was observed (Phi'(FT) = 0.671), with an increase from north to south. The parameters observed help us to understand historical and ecological conditions under which V. gigantea has experienced moderate to high levels of selfing in the face of reduced pollen flow from central to peripheral populations due to recent southward range expansion. (C) 2015 Elsevier GmbH. All rights reserved.
机译：凤梨科是新热带家庭，它与广泛的适应性辐射一起发展了生态学关键创新。其种呈现出各种不同的交配系统策略，在种内和种内，属和亚科内变化。同样，具有广泛地理范围的物种在交配系统，繁殖成功和遗传多样性方面也可能表现出很大差异。在这里，我们结合了来自手工授粉和遗传分析的数据，以评估当代大花鸟（Vriesea gigantea）范围边缘的基因流和交配系统变异的结果。花粉发芽率的结果表明，该物种是隐秘的自我不相容的。人工授粉实验和后代阵列的遗传分析表明，巨大弧菌具有混合的交配系统，具有高销售率（s = 0.612）和高近交系数（F = 0.372）。在其分布范围的南部边缘，V。gigantea的近交是由于高水平的自交而不是亲属之间的交配引起的。此外，观察到强的花粉池遗传结构（Phi'（FT）= 0.671），并且从北向南增加。所观察到的参数有助于我们了解历史和生态条件，面对近期从南向南扩展的花粉现象，从中部到外围种群的花粉流量减少，而巨型V. gigantea经历了中度到高度的自交。 （C）2015 Elsevier GmbH。版权所有。

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