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Fig. 5 | BMC Evolutionary Biology

Fig. 5

From: Age-related association of venom gene expression and diet of predatory gastropods

Fig. 5

Patterns of ontogenetic shifts of dietary diversities and levels of conotoxin gene expression. Average levels of expression of six conotoxin genes and dietary diversities are calculated with a sliding window approach (with window size of 5 mm in shell lengths). a Plot of dietary variables versus average shell lengths. Shannon’s index (H’), Gini-Simpson’s index (S), and average genetic distances (GD). The Y-axis on the left represents S and GD, whereas the Y-axis on the right represents H’. b Plot of relative levels of expression of six conotoxin loci EA1, ED20, E1, EA4, ED4, and ED8 versus shell lengths. The expression levels are centered and standardized. c Cross-correlation of conotoxin gene expression levels and dietary diversities through increasing shell lengths, using conotoxin locus ED8 and dietary variable H’ as an example. Cross-correlations of all conotoxin genes and dietary variables are illustrated in Additional file 1: Figure S5. Y-axis: correlation coefficient of two series; X-axis: lag in shell lengths of H’ in comparison to conotoxin gene expression; blue dashed lines: 95 % confidence intervals. d Linear regression of lag of expression levels of locus ED8 with the dietary variable H’ by a time period equivalent to 2 mm in shell lengths. Regression analyses of expression levels of all conotoxin genes and dietary variables are shown in Additional file 1: Figure S6

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