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Figure 4 | SpringerPlus

Figure 4

From: Snails from heavy-metal polluted environments have reduced sensitivity to carbon dioxide-induced acidity

Figure 4

Avoidance and rearing pH. Y axis (zone location) is determined by assigning a linear point value for each of eight zones. Zones close to the stimulus drop had low values and zones further away had higher values. Zones locations were recorded each minute for 20 min. These 20 values were added to derive one number for control stimulus (pond water), one for extract, and one for metal stimulus. Y values were calculated by dividing control stimulus value by the experimental stimulus (extract or metal) value. Hence, Y axis values below 1 indicate that the experimental animals moved further away from the stimulus more than they had moved under control stimulus. Letters are Tukey multiple comparisons. Identical letters indicate no significant difference between values.

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