Birefringence intensity.

<p>Mean gray value (in pixel) of the shells under polarized light in the different <i>p</i>CO₂ treatments (± SE). Bars with different letters are significantly different (Dunn post-hoc test, p<0.05,), n = 5 to 8 larvae per condition. Pictures taken under polarized light (below the graph) show birefringent patterns in the different <i>p</i>CO₂ treatments.