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A comparative study of gut microbiota profiles of earthworms fed in three different substrates

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Abstract

The gut microbiome of earthworms has a complex interdependence with the host. When the soil minerals pass through earthworm’s gut, they may affect the gut microbiota. To gain insight into the response of gut microbiota to the passed minerals, we fed earthworm (Eisenia fetida) on nutrient-poor soil and ore powder, and used high throughput sequencing to characterize the earthworm intestinal microbial community to find evidence for a core bacterial community of the E. fetida. The results showed that earthworms’ gut maintained a core microbiome that appeared in all samples. These core microbiota may play a significant role in a species’ environmental interactions. The composition of intestinal microbiomes varied with substrates. The earthworm guts from two nutrient-poor substrates had similar microbial communities and they were different from nutrient-rich substrate. Proteobacteria and Bacteroidetes were more abundant in the gut of earthworms kept on a nutrient-poor substrate such as ore powder or mineral soil than in the gut of earthworms kept in organic-rich compost soil; some of these microorganisms may help earthworms survive in nutrient-poor substrates.

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Acknowledgements

This work was supported by National Natural Science Foundation of China (U1204405 and 41373078) and Natural Science Foundation of Henan Educational Committee, China (14B180010).

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Correspondence to Dianfeng Liu or Bin Lian.

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Liu, D., Lian, B., Wu, C. et al. A comparative study of gut microbiota profiles of earthworms fed in three different substrates. Symbiosis 74, 21–29 (2018). https://doi.org/10.1007/s13199-017-0491-6

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