It is well recognized that environmental degradation caused by human activities can result in dramatic losses of species and diversity. However, comparatively little is known about the ability of biodiversity to re-emerge following ecosystem recovery. Here, we show that a European whitefish subspecies, the gangfisch Coregonus lavaretus macrophthalmus, rapidly increased its ecologically functional diversity following the restoration of Lake Constance after anthropogenic eutrophication. In fewer than ten generations, gangfisch evolved a greater range of gill raker numbers (GRNs) to utilize a broader ecological niche. A sparse genetic architecture underlies this variation in GRN. Several co-expressed gene modules and genes showing signals of positive selection were associated with GRN and body shape. These were enriched for biological pathways related to trophic niche expansion in fishes. Our findings demonstrate the potential of functional diversity to expand following habitat restoration, given a fortuitous combination of genetic architecture, genetic diversity and selection.
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The sequence datasets have been deposited in the National Center for Biotechnology Information Sequence Read Archive with the BioProject accession code PRJNA497182 (corresponding to BioSample accessions SAMN10250325 to SAMN10250521). Phenotype and ecological data are available at the ‘Enlighten: Research Data’ repository of the University of Glasgow: https://doi.org/10.5525/gla.researchdata.680.
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We thank H. Thiele, M. Schmid, W. Kornberger and A. Sulger for assistance with specimen and data collection, D. Straile for providing background data, and P. Hirsch, H. Recknagel and A. Yurchencko for comments and advice. This work was funded by a Marie Curie Action Career Integration Grant (321999) to K.R.E., a BBSRC WestBio Doctoral Training Partnership studentship to M.C., C.E.A. and K.R.E. (BB/J013854/1), ERASMUS+ (to J.B.-G. and K.R.E.), a Fisheries Society of the British Isles Research Grant (to K.R.E. and A.J.), and AFF funding from the University of Konstanz to E.Y. and J.B.-G.
The authors declare no competing interests.
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Jacobs, A., Carruthers, M., Eckmann, R. et al. Rapid niche expansion by selection on functional genomic variation after ecosystem recovery. Nat Ecol Evol 3, 77–86 (2019). https://doi.org/10.1038/s41559-018-0742-9
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