Variable Genetic Architecture Limits Cross-Range Genomic Prediction of Functional Traits in Invasive Common Ragweed (Ambrosia artemisiifolia)

Abstract

Functional trait expression is a potentially powerful predictor of invasion success, but the reliability of trait-based predictions across populations depends on the consistency of genetic architecture. We tested this assumption using common ragweed (Ambrosia artemisiifolia), an annual plant native to North America that has invaded Europe and Australia. Using genome-wide markers (158,652 SNPs) and five functional traits measured in a common garden, we characterised trait correlations, genetic architecture, evolutionary potential, and the transferability of genomic prediction (GP) models across the native and invasive ranges. Genetic and phenotypic diversity and their correlation declined fro..