Responses of intertidal bacterial biofilm communities to increasing pCO2
Responses of intertidal bacterial biofilm communities to increasing pCO2
复制标题
潮间带细菌生物膜群落对 pCO2 增加的反应
DOI：
10.1007/s10126-020-09958-3
复制
发表时间：
2020
影响因子：
3
通讯作者：
Adams J. and Hall-Spencer J.
中科院分区：
文献类型：
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作者：
Kerfahi D.;Harvey B.;Agostini S.;Kon K.;Huang R.;Adams J. and Hall-Spencer J.
海洋酸化对生态系统的影响仍然知之甚少，因为很难模拟二氧化碳浓度升高对整个海洋群落的影响。富含二氧化碳的自然系统正被用来帮助了解海洋酸化的长期影响。在这里，我们比较了日本沿海海水二氧化碳梯度的潮间带鹅卵石/巨石和基岩上的生物膜细菌群落。16S rRNA测序结果显示，不同co2浓度和不同生境类型的细菌群落存在差异。在这两个栖息地中，细菌多样性在酸化条件下都有所增加。pco2的差异与优势门相对丰度的差异有关。然而，尽管群落组成存在差异，但没有迹象表明这些变化对养分循环和生态系统功能有显著影响。其他研究表明，除了海水化学对生物膜的直接影响外，微藻生长的增加和放牧的减少也可能导致高CO2环境下细菌组成的变化。因此，全球二氧化碳浓度升高对细菌群落组成的影响需要进一步研究，以评估其对海洋生态系统功能的影响。然而，生物膜沿着pco2梯度明显缺乏功能变化，这是浅海边缘生态系统功能稳定性的一个可靠指标。
The effects of ocean acidification on ecosystems remain poorly understood, because it is difficult to simulate the effects of elevated CO2on entire marine communities. Natural systems enriched in CO2are being used to help understand the long-term effects of ocean acidification in situ. Here, we compared biofilm bacterial communities on intertidal cobbles/boulders and bedrock along a seawater CO2gradient off Japan. Samples sequenced for 16S rRNA showed differences in bacterial communities with differentpCO2and between habitat types. In both habitats, bacterial diversity increased in the acidified conditions. Differences inpCO2were associated with differences in the relative abundance of the dominant phyla. However, despite the differences in community composition, there was no indication that these changes would be significant for nutrient cycling and ecosystem function. As well as direct effects of seawater chemistry on the biofilm, increased microalgal growth and decreased grazing may contribute to the shift in bacterial composition at high CO2, as documented by other studies. Thus, the effects of changes in bacterial community composition due to globally increasingpCO2levels require further investigation to assess the implications for marine ecosystem function. However, the apparent lack of functional shifts in biofilms along thepCO2gradient is a reassuring indicator of stability of their ecosystem functions in shallow ocean margins.