Age, sun and substrate: triggers of bacterial communities in lichens
Age, sun and substrate: triggers of bacterial communities in lichens
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DOI：
10.1111/j.1758-2229.2011.00272.x
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发表时间：
2012-02-01
影响因子：
3.3
通讯作者：
Grube, Martin
中科院分区：
文献类型：
--
作者：
Cardinale, Massimiliano;Steinova, Jana;Grube, Martin
细菌群落以类似生物膜的方式在地衣表面定居。地衣所含细菌群落的整体结构显示出相似性，特别是尚未培养的Alphaproteobacteria的优势。导致地衣相关细菌群落的丰度、组成和空间组织变化的参数迄今知之甚少。作为第一步，我们使用了显微镜的方法来测试地衣的内在和外在的环境因素与11地衣样品，属于6个物种的细菌群落的意义。这些物种中的一些具有明显的年龄梯度的菌体。一个统计上的显著影响可以归因于叶状体部分的年龄，这是一个内在因素：地衣的生长部分宿主的细菌群落与叶状体的老化部分显著不同。基质类型（岩石，树木，林下植物）和（在较低程度上）暴露于阳光下也影响了细菌群落。有趣的是，地衣中细菌细胞的丰度也受到相同结构触发因素的影响。地衣种类、分化的叶状体部分或叶状体生长类型对主要细菌群的组成没有影响。我们的研究结果是重要的地衣细菌生态学的实验设计。
Bacterial communities colonize the surfaces of lichens in a biofilm-like manner. The overall structure of the bacterial communities harboured by the lichens shows similarities, in particular the dominance of not yet cultured Alphaproteobacteria. Parameters causing variation in abundance, composition and spatial organization of the lichen-associated bacterial communities are so far poorly understood. As a first step, we used a microscopic approach to test the significance of both lichen-intrinsic and extrinsic environmental factors on the bacterial communities associated with 11 lichen samples, belonging to six species. Some of these species have thalli with a distinct age gradient. A statistically significant effect can be attributed to the age of the thallus parts, which is an intrinsic factor: growing parts of the lichens host bacterial communities that significantly differ from those of the ageing portions of the thalli. The substrate type (rock, tree, understory) and (at a lower extent) the exposition to the sun also affected the bacterial communities. Interestingly, the abundance of bacterial cells in the lichens was also influenced by the same structure-triggering factors. No effect on the composition with main bacterial groups was attributed to different lichen species, differentiated thallus parts or thallus growth type. Our results are important for the experimental designs in lichen-bacterial ecology.