The thermal environment at fertilisation mediates adaptive potential in the sea

Additive genetic variation for fitness at vulnerable life stages governs the adaptive potential of populations facing stressful conditions under climate change, and can depend on current conditions as well as those experienced by past stages or generations. For sexual populations, fertilisation is the key stage that links one generation to the next, the effects of fertilisation environment on adaptive potential at the vulnerable stages that then unfold during development are rarely considered, despite climatic stress posing risks for gamete function and fertility in many taxa and external fertilisers especially. Here, we develop a simple fitness landscape model exploring the effects of environmental stress at fertilisation and development on adaptive potential in early life. We then test our model with a quantitative genetic breeding design exposing family groups of a marine external fertiliser, the tubeworm Galeolaria caespitosa, to a factorial manipulation of current and projected tem..., , , # The thermal environment at fertilisation mediates adaptive potential in the sea

[https://doi.org/10.5061/dryad.wpzgmsbm9](https://doi.org/10.5061/dryad.wpzgmsbm9)

## Description of the data and file structure

#### File: evo\_letters\_2021\_data.csv

**Description:** 

Data shows survival of larvae at different temperatures and the relatedness of theses larvae.

##### Variables

* Animal= ID of individual animal 
* Block= the experimental block this animal was tested in
* Sire = sure of each animal 
* Dam =dam of each animal 
* Fam= parental combination for each animal 
* Fert = fertilization temperature (C - cold , H - hot)
* Devo= developmental temperature (C - cold , H - hot)
* Env = combination of fert and Devo
* Rep= replicate 
* Embryo = numbers of embryos in each rep
* Hatching= numbers of surviving embryos per rep
* Survival= hatching/ embryo

#### File: evo\_letters\_2021\_code.R