Data from: Multiple evolutionary pathways to decreased lateral plate coverage in freshwater threespine sticklebacks
| Main Authors: | Leinonen, Tuomas Eerikki, McCairns, R.J. Scott, Herczeg, Gabor, Merila, Juha |
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| Format: | info dataset Journal |
| Terbitan: |
, 2012
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/4969388 |
Daftar Isi:
- Adaptation to novel environments can be based either on standing genetic variation or variation attributable to new mutations. When standing genetic variation for a functional adaptation is lacking, and variation due to new mutations is not yet available, adaptation is possible only through alternative functional solutions. Reduction in the number of bony lateral plates as an adaptation to freshwater colonization by marine threespine sticklebacks (Gasterosteus aculeatus) has occurred in numerous independent cases through allelic substitution in the ectodysplasin-a (Eda) gene. Studying the phenotypic and genetic variation in plate number and size in five marine and six freshwater threespine stickleback populations, we found that when variation in Eda was limiting (i.e. alleles associated with the low-plate morph were missing or in extremely low frequency), plate number reduction did not take place in freshwater populations, but reduced lateral plate coverage was achieved by a reduction in the size of lateral plates. Our results suggest that this phenotypically and genetically discrete "small-plated" threespine stickleback – which is the dominant form in three northern European freshwater populations – may be functionally equivalent to the low-plated morph and hence, serve as an example of convergent evolution towards functional similarity in the face of genetic constraints.
- dryad_polymorphic_lociGenepop file format of polymorphic loci used to test for bottlenecks and demographic expansion. For details see Methods.QTL_lateralplatesGenotype data for the putative lateral plate QTL including individuals not phenotyped. Ind - individual, Pop - population, alleles one and two for each locus are provided as separate columns, e.g. Stn380.1 for locus 1 of Stn380 and Stn380.2 for locus 2 of Stn380.dryad.QTL.csvlateral_plate_morphologyLateral plate size and genotypes for putative lateral plate QTL and Eda. Hab-habitat, Morph-lateral plate morph (see Methods for morph classification), body.d-body depth, rat.4-ratio of lateral plate height at fourth myomere and body depth.dryad.morph.csv