Overcoming the congenitally disadvantageous mutation through adaptation to environmental UV exposure in land snails

Congenital fitness-disadvantageous mutations are not maintained in the population; they are purged from the population through processes such as purifying selection. However, these mutations could persist in the population as polymorphisms when it is advantageous for the individuals carrying them to adapt to a specific external environment. We tested this hypothesis using the dimorphic land snail Euhadra peliomphala simodae in Japan; these snails have dark or bright-coloured shells. The survival rate of dark snails at hatching was lower than that of the bright ones, as observed in the F1 progenies produced through crossing. Dark snails have a congenital fitness-disadvantageous mutation; however, they also have protection against ultraviolet radiation. They have a higher survival rate than the bright snails in a UV environment, as observed using the UV exposure experiments and UV transmittance measurements. This is a good example of a congenitally disadvantageous mutation that is advanta..., , , # Overcoming the congenitally disadvantageous mutation through adaptation to environmental UV exposure in land snails

[https://doi.org/10.5061/dryad.qz612jmnf](https://doi.org/10.5061/dryad.qz612jmnf)

## File list

1. 2.1.Crossing.csv – The data file of the crossing experiment in section 2.1.
* Categories of mating pair (Dark-Dark(BB) or Bright-Bright(ww)
* Individual status (alive (1) or dead (2))
* Passed days
2. 2.2.Thermal\_exposure.csv – The data file of the thermal exposure experiment is in section 2.2.
* Individual ID
* Increasing rate of inner temperature
* Decreasing rate of inner temperature
* Shell colour values (standardised luminance)
3. 2.3.UV\_exposure.csv – The data file of the ultraviolet exposure experiment in section 2.3.
* Individual ID
* Experiment conditions (UV condition or control)
* Individual status (alive (0) or dead (1))
* Passed days
* Shell colour values (standardised luminance)
4. 2.4.UV\_transmittance.csv ...