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Genomic signatures of local adaptation to the degree of environmental predictability in rotifers

Franch-Gras, Lluis; Hahn, Christoph; García-Roger, Eduardo M.; Carmona, María José; Serra, Manuel; Gómez, Africa

Authors

Lluis Franch-Gras

Christoph Hahn

Eduardo M. García-Roger

María José Carmona

Manuel Serra



Abstract

Environmental fuctuations are ubiquitous and thus essential for the study of adaptation. Despite
this, genome evolution in response to environmental fuctuations —and more specifcally to the
degree of environmental predictability– is still unknown. Saline lakes in the Mediterranean region
are remarkably diverse in their ecological conditions, which can lead to divergent local adaptation
patterns in the inhabiting aquatic organisms. The facultatively sexual rotifer Brachionus plicatilis shows
diverging local adaptation in its life-history traits in relation to estimated environmental predictability
in its habitats. Here, we used an integrative approach —combining environmental, phenotypic and
genomic data for the same populations– to understand the genomic basis of this diverging adaptation.
Firstly, a novel draft genome for B. plicatilis was assembled. Then, genome-wide polymorphisms were
studied using genotyping by sequencing on 270 clones from nine populations in eastern Spain. As a
result, 4,543 high-quality SNPs were identifed and genotyped. More than 90 SNPs were found to
be putatively under selection with signatures of diversifying and balancing selection. Over 140 SNPs
were correlated with environmental or phenotypic variables revealing signatures of local adaptation,
including environmental predictability. Putative functions were associated to most of these SNPs, since
they were located within annotated genes. Our results reveal associations between genomic variation
and the degree of environmental predictability, providing genomic evidence of adaptation to local
conditions in natural rotifer populations.

Citation

Franch-Gras, L., Hahn, C., García-Roger, E. M., Carmona, M. J., Serra, M., & Gómez, A. (2018). Genomic signatures of local adaptation to the degree of environmental predictability in rotifers. Scientific reports, 8(1), https://doi.org/10.1038/s41598-018-34188-y

Journal Article Type Article
Acceptance Date Sep 27, 2018
Online Publication Date Oct 30, 2018
Publication Date Dec 1, 2018
Deposit Date Oct 31, 2018
Publicly Available Date Nov 1, 2018
Journal Scientific Reports
Print ISSN 2045-2322
Electronic ISSN 2045-2322
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 8
Issue 1
Article Number 16051
DOI https://doi.org/10.1038/s41598-018-34188-y
Keywords Multidisciplinary
Public URL https://hull-repository.worktribe.com/output/1138730
Publisher URL https://www.nature.com/articles/s41598-018-34188-y.pdf

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Publisher Licence URL
https://creativecommons.org/licenses/by/4.0/

Copyright Statement
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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.





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