Title

Sex-biased genetic component distribution among populations: additive genetic and maternal contributions to phenotypic differences among populations of Chinook salmon

Document Type

Article

Publication Date

2012

Publication Title

Journal of Evolutionary Biology

Volume

25

Issue

4

First Page

682

Last Page

690

DOI

10.1111/j.1420-9101.2012.02462.x

Keywords

atlantic salmon; body-weight; chinook salmon; common garden designs; consequences; early-life-history; Evolution; fitness-related traits; fresh-water; local adaptation; local adaptation; Maternal effects; pacific; Quantitative genetics; salar; survival

Abstract

An approach frequently used to demonstrate a genetic basis for population-level phenotypic differences is to employ common garden rearing designs, where observed differences are assumed to be attributable to primarily additive genetic effects. Here, in two common garden experiments, we employed factorial breeding designs between wild and domestic, and among wild populations of Chinook salmon (Oncorhynchus tshawytscha). We measured the contribution of additive (VA) and maternal (VM) effects to the observed population differences for 17 life history and fitness-related traits. Our results show that, in general, maternal effects contribute more to phenotypic differences among populations than additive genetic effects. These results suggest that maternal effects are important in population phenotypic differentiation and also signify that the inclusion of the maternal source of variation is critical when employing models to test population differences in salmon, such as in local adaptation studies.

Comments

This is an accepted manuscript version of an aritcle whose version of record was published in:Journal of Evolutionary Biology: http://dx.doi.org/10.1111/j.1420-9101.2012.02462.x