Ecological stoichiometry and fungal community turnover reveal variation among mycorrhizal partners in their responses to warming and drought

生物 生态系统 生态学 生态化学计量学 营养物 共生 微生物种群生物学 气候变化 植物 菌丝 植物群落 耐旱性 物种丰富度 遗传学 细菌
作者
Haiyang Zhang,Amber C. Churchill,Ian C. Anderson,Chioma Igwenagu,Sally A. Power,Jonathan M. Plett,Catriona A. Macdonald,Elise Pendall,Yolima Carrillo,Jeff R. Powell
出处
期刊:Molecular Ecology [Wiley]
卷期号:32 (1): 229-243 被引量:6
标识
DOI:10.1111/mec.16278
摘要

Symbiotic fungi mediate important energy and nutrient transfers in terrestrial ecosystems. Environmental change can lead to shifts in communities of symbiotic fungi, but the consequences of these shifts for nutrient dynamics among symbiotic partners are poorly understood. Here, we assessed variation in carbon (C), nitrogen (N) and phosphorus (P) in tissues of arbuscular mycorrhizal (AM) fungi and a host plant (Medicago sativa) in response to experimental warming and drought. We linked compositional shifts in AM fungal communities in roots and soil to variation in hyphal chemistry by using high-throughput DNA sequencing and joint species distribution modelling. Compared to plants, AM hyphae was 43% lower in (C) and 24% lower in (N) but more than nine times higher in (P), with significantly lower C:N, C:P and N:P ratios. Warming and drought resulted in increases in (P) and reduced C:P and N:P ratios in all tissues, indicating fungal P accumulation was exacerbated by climate-associated stress. Warming and drought modified the composition of AM fungal communities, and many of the AM fungal genera that were linked to shifts in mycelial chemistry were also negatively impacted by climate variation. Our study offers a unified framework to link climate change, fungal community composition, and community-level functional traits. Thus, our study provides insight into how environmental change can alter ecosystem functions via the promotion or reduction of fungal taxa with different stoichiometric characteristics and responses.
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