Genetic distance predicts trait differentiation at the subpopulation but not the individual level in eelgrass, Zostera marina

Ecology and Evolution
Jessica M AbbottJohn J Stachowicz

Abstract

Ecological studies often assume that genetically similar individuals will be more similar in phenotypic traits, such that genetic diversity can serve as a proxy for trait diversity. Here, we explicitly test the relationship between genetic relatedness and trait distance using 40 eelgrass (Zostera marina) genotypes from five sites within Bodega Harbor, CA. We measured traits related to nutrient uptake, morphology, biomass and growth, photosynthesis, and chemical deterrents for all genotypes. We used these trait measurements to calculate a multivariate pairwise trait distance for all possible genotype combinations. We then estimated pairwise relatedness from 11 microsatellite markers. We found significant trait variation among genotypes for nearly every measured trait; however, there was no evidence of a significant correlation between pairwise genetic relatedness and multivariate trait distance among individuals. However, at the subpopulation level (sites within a harbor), genetic (FST) and trait differentiation were positively correlated. Our work suggests that pairwise relatedness estimated from neutral marker loci is a poor proxy for trait differentiation between individual genotypes. It remains to be seen whether genomewide ...Continue Reading

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Citations

May 30, 2021·Proceedings of the National Academy of Sciences of the United States of America·Katie L BarottRuth D Gates
Jan 11, 2022·Global Change Biology·Katherine DuBoisJohn J Stachowicz

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Methods Mentioned

BETA
PCA

Software Mentioned

STORM
Vegan
stats
R package QstFstComp
R
R Core
ARLEQUIN

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