Temperature niche position and breadth of ectomycorrhizal fungi: Reduced diversity under warming predicted by a nested community structure
Temperature niche position and breadth of ectomycorrhizal fungi: Reduced diversity under warming predicted by a nested community structure
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DOI：
10.1111/gcb.14446
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发表时间：
2018-12-01
影响因子：
11.6
通讯作者：
Nara, Kazuhide
中科院分区：
文献类型：
--
作者：
Miyamoto, Yumiko;Terashima, Yoshie;Nara, Kazuhide
生态位宽度较窄的物种比生态位宽度较宽的物种更容易受到环境变化的影响。虽然关于生态位特性的信息对于预测生物对环境变化的反应是必要的，但这些信息在很大程度上缺乏土壤微生物。在这项研究中，我们提出了一个功能重要的真核土壤微生物群，外生菌根（EM）真菌的温度生态位和宽度。我们收集了来自日本26个森林站点（年平均温度范围为1.6至23.6℃）的高质量EM真菌序列数据，以创建每个真菌物种的温度生态位曲线。应用巢式理论和新建立的加权随机化零模型对75个高发生记录的真菌操作分类单位（otu）进行了研究，以考察其对特定温度位置和宽度的潜在偏好。我们的分析显示：(a)许多EM真菌OTU局限于年平均温度较低的栖息地，(b)在较冷地点观察到的真菌OTU的温度宽度比偶然预期的要窄，(c) EM真菌OTU的组成沿温度梯度呈现巢状模式，(d) EM真菌丰富度在较冷地点最高，OTU发生的重叠程度最大。这些发现表明，未来的变暖可能会限制许多目前只适应寒冷气候的EM真菌物种的分布。这可能最终会降低EM真菌的生物多样性，而EM真菌通过与树木的共生关系与森林功能有关。本研究揭示了不同EM真菌种类的分布和环境范围，有助于建立物种分布模型，以期在气候变化的情况下保护微生物。
Species with narrow niche breadths are assumed to be more susceptible to environmental changes than those with wide niche breadths. Although information on niche properties is necessary for predicting biological responses to environmental changes, such information is largely missing for soil microbes. In this study, we present the temperature niche positions and breadths of a functionally important group of eukaryotic soil microbes, ectomycorrhizal (EM) fungi. We compiled high-quality EM fungal sequence data from 26 forested sites in Japan (with mean annual temperatures ranging from 1.6 to 23.6 degrees C) to create temperature niche profiles for each individual fungal species. Nested theory and a newly developed weighted-randomization null model were applied to 75 fungal operational taxonomic units (OTUs) with high occurrence records to examine potential preferences for certain temperature positions and breadths. Our analyses revealed that (a) many EM fungal OTUs were restricted to habitats with low mean annual temperatures, (b) fungal OTUs observed at colder sites exhibited narrower temperature breadths than expected by chance, (c) the composition of EM fungal OTUs exhibited a nested pattern along the temperature gradient, and (d) EM fungal richness was highest at colder sites, where the greatest degree of overlap in OTU occurrence was observed. These findings imply that future warming may limit the distribution of many EM fungal species that are currently adapted to only cold climates. This could eventually reduce EM fungal biodiversity, which is linked to forest function through symbiotic associations with trees. This study demonstrates the distribution and environmental ranges of various EM fungal species and can contribute to develop species distribution models with the aim of conserving microbes in the face of climate change.