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. 2021 Sep 22;11:18793. doi: 10.1038/s41598-021-97890-4

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Spearman correlations indicate significant (positive and negative) relationships between microbial species and sea sickness. r: Spearman's correlation coefficient. Species of genus Propionibacterium (r = 0.49, p = 0.001) show strong positive correlation while that of genus Bacteroides (r = − 0.49 and − 0.46, p = 0.001 and 0.003) show negative correlation with sea-sickness. Lactobacillus acidophilus was positively correlated (r = 0.27, p = 0.1) and Bifidobacterium longum was negatively correlated (r = − 0.14, p = 0.4). p-value < 0.05 was considered statistically significant.