The gut eukaryotic microbiota influences the growth performance among cohabitating shrimp
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Increasing evidence has revealed a close interplay between the gut bacterial communities and host growth performance. However, until recently, studies generally ignored the contribution of eukaryotes, endobiotic organisms. To fill this gap, we used Illumina sequencing technology on eukaryotic 18S rRNA gene to compare the structures of gut eukaryotic communities among cohabitating retarded, overgrown, and normal shrimp obtained from identically managed ponds. Results showed that a significant difference between gut eukaryotic communities differed significantly between water and intestine and among three shrimp categories. Structural equation modeling revealed that changes in the gut eukaryotic community were positively related to digestive enzyme activities, which in turn influenced shrimp growth performance (λ = 0.97, P < 0.001). Overgrown shrimp exhibited a more complex and cooperative gut eukaryotic interspecies interaction than retarded and normal shrimp, which may facilitate their nutrient acquisition efficiency. Notably, the distribution of dominant eukaryotic genera and shifts in keystone species were closely concordant with shrimp growth performance. In summary, this study provides an integrated overview on direct roles of gut eukaryotic communities in shrimp growth performance instead of well-studied bacterial assembly.
KeywordsShrimp growth performance Gut eukaryotic community Structural equation modeling Interspecies interaction
We appreciate Editor Ursula Kües and the two anonymous reviewers for their constructive comments. This work was supported by the Zhejiang Province Public Welfare Technology Application Research Project (2016C32063), and Education Department (Y201327177), the Project of Science and Technology Department of Ningbo (2017C10044), and the K.C. Wong Magna Fund in Ningbo University.
Compliance with ethical standards
This article does not contain any studies with human participants performed by any of the authors. All applicable international, national, and/or institutional guidelines for the care and use of animals were followed the National Institutes of Health Guide for the Care and Use of Laboratory Animals.
Conflict of interest
The authors declare that they have no conflict of interest.
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