Data from: Evolutionary time-series analysis reveals the signature of frequency-dependent selection on a female mating polymorphism
Le Rouzic, Arnaud
Hansen, Thomas F.
Gosden, Thomas P.
Svensson, Erik I.
Published Dec 30, 2014 on Dryad.
Cite this dataset
Le Rouzic, Arnaud; Hansen, Thomas F.; Gosden, Thomas P.; Svensson, Erik I. (2014). Data from: Evolutionary time-series analysis reveals the signature of frequency-dependent selection on a female mating polymorphism [Dataset]. Dryad. https://doi.org/10.5061/dryad.bj86g
A major challenge in evolutionary biology is understanding how stochastic and deterministic factors interact and influence macroevolutionary dynamics in natural populations. One classical approach is to record frequency changes of heritable and visible genetic polymorphisms over multiple generations. Here, we combined this approach with a maximum likelihood–based population-genetic model with the aim of understanding and quantifying the evolutionary processes operating on a female mating polymorphism in the blue-tailed damselfly Ischnura elegans. Previous studies on this color-polymorphic species have suggested that males form a search image for females, which leads to excessive mating harassment of common female morphs. We analyzed a large temporally and spatially replicated data set of between-generation morph frequency changes in I. elegans. Morph frequencies were more stable than expected from genetic drift alone, suggesting the presence of selection toward a stable equilibrium that prevents local loss or fixation of morphs. This can be interpreted as the signature of negative frequency-dependent selection maintaining the phenotypic stasis and genetic diversity in these populations. Our novel analytical approach allows the estimation of the strength of frequency-dependent selection from the morph frequency fluctuations around their inferred long-term equilibria. This approach can be extended and applied to other polymorphic organisms for which time-series data across multiple generations are available.
Female Color Morph Counts
The file reports the counts in female color morphs of damselflies (I. elegans) in 12 ponds of southern Sweden, for 12 consecutive years (2000 to 2011). The number of females of each morph (A, I, and O) is reported in three distinct tables (years as lines, populations as columns). The file is formatted such that it can be read by our statistical program.
This ZIP file contains all scripts and code to reproduce the statistical analyses of our paper. Programs R and ADMB should be installed on the computer. Scripts were run on a Linux/Ubuntu operating system. Directory 'analysis': scripts to generate the figures (there could be minor differences compared to the published version). Directory 'data' contains the data (same file as already published on Dryad). Directory 'model' contains the ADMB code to run the model (should be compiled with ADMB). Directory 'suppl' contains the material necessary to run the supplementary analyses, including simulations and tests for the robustness of the model. Note that this supplementary analyses were run on a powerful server and may require a significant amount of computational power.