Characterizing contemporary evolutionary change in a recently isolated population of Threespine Stickleback (Gasterosteus aculeatus L.)

Parallel evolution of lateral plates and body shape in threespine stickleback (Gasterosteus aculeatus) is an iconic example of adaptation. We test a case of contemporary evolutionary transition in a recently isolated population of marine G. aculeatus in British Columbia, Canada. We investigate Ectodysplasin (Eda) genotypes, plate counts, neutral genetic divergence and whole-body phenotypes to determine genetic and phenotypic distance between this population and nearby comparative populations. Our focal population is in the process of adapting both genetically and phenotypically to a freshwater environment and we provide an example of the genetic basis for parallel evolutionon a contemporary timescale. The frequency of Eda genotypes and lateral plate phenotypes in our focal population are not consistent with those of marine or fully freshwater populations. Although our focal population is genetically distinct from nearby marine populations, these fish still more closely resemble marine p..., , , # Characterizing contemporary evolutionary change in a recently isolated population of Threespine Stickleback (Gasterosteus aculeatus L.)

The dataset contains R code and raw data files required to analyze 3D body shape and genetic divergence in this population of threespine stickleback along with a set of comparator data.

## Description of the data and file structure

DATA-SPECIFIC INFORMATION FOR:KOZAK_LL_COMPILED.csv

File contents: Specimen information and 3D landmark coordinates obtained from CT scans for specimens from Lost Lagoon

Variable List: see accompanying publication for details about each variable

ID: specimen ID

Population: population name

Eda: ectodysplasin genotype

Sex: genetic sex

RawCoord1-402: raw 3D landmark coordinates in XYZXYZ format

DATA-SPECIFIC INFORMATION FOR:KOZAK_ALLDATA_COMPILED.csv

File contents: Specimen information and 3D landmark coordinates obtained from CT scans for comparator specimens

Variable List: see accompanying publication for de...