干旱
基因流
生态学
植被(病理学)
末次冰期最大值
栖息地
物种分布
沙漠气候
地理
生物
冰期
遗传变异
古生物学
医学
生物化学
病理
基因
作者
Ron Eric Stein,César R. Luque-Fernández,Christiane Kiefer,Johanna Möbus,G. Anthony Pauca-Tanco,Sarina Jabbusch,Dörte Harpke,Julia Bechteler,Dietmar Quandt,Francisco Villasante Benavides,Marcus A. Koch
标识
DOI:10.1016/j.gloplacha.2023.104258
摘要
Epiarenic (sand-growing) Tillandsia vegetation in the hyperarid and arid region of the Chilean-Peruvian Atacama Desert represents an extreme case of adaptation in plant species-poor ecosystems. The involved species exist at the limit of terrestrial life and form mono/oligo-specific and very characteristic structures within the landscape. Covering thousands of square kilometers they represent the major carbon sink in the hyperarid Atacama core. The various Tillandsia species and respective vegetation may have evolved and adapted independently to this extreme environment. The most abundant vicariant diploid species are T. landbeckii in Chile and T. purpurea in Peru. Spatio-temporally varying distribution range overlaps may have caused potentially adaptive gene flow between different species leading to present day gene pools. Using species distribution modelling we explored the idea that from Last Glacial Maximum (LGM) onwards both species shifted their distribution ranges, which resulted in the formation of varying suture zones from Peru towards northern Chile. We further explored genetic data from a Tillandsia loma vegetation in Southern Peru with three sympatrically growing species exemplifying inter-species gene flow crossing even ploidy levels. This mechanism highlights a strategy to evolve and adapt more rapidly to environmental changes in extreme arid and hyperarid habitats and provides an opportunity for Tillandsia populations to efficiently conserve new genotypes via subsequent clonal propagation.
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