Long-term experimental warming alters community composition of ascomycetes in Alaskan moist and dry arctic tundra

Arctic tundra regions have been responding to global warming with visible changes in plant community composition, including expansion of shrubs and declines in lichens and bryophytes. Even though it is well-known that the majority of arctic plants are associated with their symbiotic fungi, how fungal community composition will be different with climate warming remains largely unknown. In this study, we addressed the effects of long-term (18 years) experimental warming on the community composition and taxonomic richness of soil ascomycetes in dry and moist tundra types. Using deep Ion Torrent sequencing we quantified how OTU assemblage and richness of different orders of Ascomycota changed in response to summer warming. Experimental warming significantly altered ascomycete communities with stronger responses observed in the moist tundra compared to dry tundra. The proportion of several lichenized and moss-associated fungi decreased with warming, while the proportion of several plant and ...

北极苔原（Arctic tundra）区域已对全球变暖产生响应，植物群落组成出现可观测的变化，包括灌木扩张以及地衣（lichens）和苔藓植物（bryophytes）的衰退。尽管学界已普遍知晓多数北极植物与其共生真菌（symbiotic fungi）存在共生关联，但气候变暖下真菌群落组成将发生何种改变，目前仍在很大程度上未被阐明。本研究针对为期18年的实验增温，探究了其对干燥苔原与湿润苔原类型中土壤子囊真菌（soil ascomycetes）的群落组成及分类学丰富度的影响。本研究采用深度Ion Torrent测序技术，量化分析了子囊菌门（Ascomycota）不同目级类群的操作分类单元（Operational Taxonomic Unit，OTU）集合及其丰富度如何响应夏季增温。实验增温显著改变了子囊真菌群落，且相较于干燥苔原，湿润苔原中的子囊真菌群落响应更为强烈。部分地衣共生真菌与苔藓关联真菌的占比随增温出现下降，而部分植物相关及……