Impacts of tropospheric ozone exposure on peatland microbial consumers
Impacts of tropospheric ozone exposure on peatland microbial consumers
复制标题
DOI：
10.1016/j.soilbio.2017.08.012
复制
发表时间：
2017-12
影响因子：
9.7
通讯作者：
R. Payne;S. Toet;M. Ashmore;V. Jassey;D. Gilbert
中科院分区：
文献类型：
--
作者：
R. Payne;S. Toet;M. Ashmore;V. Jassey;D. Gilbert
对流层臭氧污染被认为是对陆地生态系统的重要威胁，但人们对泥炭地的影响知之甚少，尽管泥炭作为全球碳库的重要性。在这里，我们调查了对流层臭氧暴露的三个水平升高对泥炭地微生物群落的影响，特别是对主要的微生物消费者--变形虫的影响。我们发现，中等(环境空气+0.25万亿ppb臭氧)和高臭氧处理(环境空气+夏季+35ppb，全年+10ppb)导致了州内阿米巴群落的显著变化，以Phyrganellaspp的丰度增加为代表。因此，观察到的阿米巴群落的变化可能是由于臭氧引起的真菌或其他微生物群落丰度的变化。我们没有发现未分化微藻、线虫或轮虫数量变化的证据，但确实发现鞭毛虫和纤毛虫数量增加的证据很弱。我们的结果提供了第一个直接数据来显示臭氧对泥炭地微生物消费者的影响。
Tropospheric ozone pollution is recognised as an important threat to terrestrial ecosystems but impacts on peatlands are little understood despite the importance of peat as a global carbon store. Here we investigate the impacts of three levels of elevated exposure to tropospheric ozone on peatland microbial communities with a particular focus on testate amoebae, the dominant microbial consumers. We found that intermediate (ambient + 25 ppb O3) and high ozone treatments (ambient +35 ppb summer, +10 ppb year round) led to significant changes in testate amoeba communities, typified by an increase in abundance ofPhyrganellaspp. and loss of diversity.Phyrganellais often suggested to feed on fungi so the observed community change in testate amoeba could be due to ozone-induced changes in the abundance of fungi or other microbial groups. We do not find evidence for changes in numbers of undifferentiated microalgae, nematodes or rotifers but do find weak evidence for an increase in flagellates and ciliates. Our results provide the first direct data to show the impact of ozone on microbial consumers in peatlands.