Data and code for: Multiple genetic impacts of immigration interact to shape local population persistence versus extinction

Major ongoing theoretical and empirical challenges are to predict the impacts of immigration on extinction probabilities of remaining populations within fragmented habitats. Comprehensive prediction requires considering multiple genetic effects on demography, including inbreeding and resulting inbreeding depression, additive genetic variance in fitness and resulting adaptive micro-evolution, and local adaptation and resulting migration load. However, all such effects have not been quantified or modelled simultaneously, especially for small wild populations experiencing regular natural immigration. We used quantitative genetic individual-based simulations parameterised using long-term data from song sparrows (Melospiza melodia) to show that, contrary to broad expectation, increasing immigration could slightly increase short-term extinction probability. This outcome arose because, while immigration reduced inbreeding and resulting expression of inbreeding depression, migration load stemmi..., , , # Data and code for: Multiple genetic impacts of immigration interact to shape local population persistence versus extinction

[https://doi.org/10.5061/dryad.tx95x6b70](https://doi.org/10.5061/dryad.tx95x6b70)

## Description of the data and file structure

The data are the outputs of a quantitative genetic individual-based simulation model.  The R scripts for the model and to produce figures from the simulated data are also provided.

The overarching aims were to investigate how multiple genetic effects (inbreeding depression, additive genetic variance, and local adaptation) affect the probability of extinction of a small population receiving immigrants.

### Files and variables

#### Explanations of R code and simulated data:

**Summary of R code and data files provided:**

There are five files containing R scripts (originally produced and run with R v4.2.1)

\"PopSims_RCode_RunBlock_Final.txt\"

\"Heatmap_RCode_Final.txt\"

\"CombinedFigures_RCode_Final.txt\"

\"CombinedFiguresStoch_RCode_F...,