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Fig. 1 | Frontiers in Zoology

Fig. 1

From: Natural variation in yolk fatty acids, but not androgens, predicts offspring fitness in a wild bird

Fig. 1

Relationships between egg yolk components and fitness proxies in great tit nestlings. Yolk components are grouped based on a principal component analysis. PC1 was mainly represented by high concentrations of vitamin E (α-tocopherol) and ω-6 polyunsaturated fatty acids (PUFAs), PC2 by high concentrations of saturated fatty acids (SFAs), mono-unsaturated fatty acids (MUFAs) and ω-3 PUFAs, and PC3 by high concentrations of androgens (androstenedione, 5α-dihydrotestosterone and testosterone) and carotenoids (lutein and zeaxanthin; Additional file 1). Shown are the standardized effect sizes with their corresponding 95% credible intervals (CrIs). Filled circles indicate statistically meaningful support (i.e., if the mean difference between compared estimates is higher than 0.95) for the effect of a set of yolk components on fitness proxies

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