Feeding.

<p>(A) Larvae are allowed to feed on either a red-dyed, PURE Petri dish (left) or on a red-dyed, 5 mM QUI-containing Petri dish (right), for 15 minutes. Using a digital camera, a picture is taken and the area of red colour in individual larvae (indicating the amount eaten) as well as the area size of the whole body is determined for the calculation of the Feeding Index. (B) Feeding Indices of larvae fed on QUI in a concentration range between 0.05 mM and 5 mM. Positive Feeding Index values (FI) indicate that larvae eat more on a QUI than on a PURE Petri dish, negative scores indicate QUI-induced suppression of feeding. Larvae show feeding suppression for QUI concentrations in a range from 0.5 mM to 5 mM. Please mind the truncated axis. Shading of the boxes indicates significant differences from chance behaviour (i.e. zero, one-sample sign tests) (<i>P</i><0.05/7, keeping the experiment-wide error rate at 5% [i.e. Bonferroni correction]); labelling of * or ns refers to <i>P</i><0.05/2 or <i>P</i>>0.05/2 in Mann-Whitney U-tests. Box plots represent the median as the middle line and 25%/75% and 10%/90% as box boundaries and whiskers, respectively. Sample sizes: from left to right N = 90, 70, 200, 119, 147, 70, 162.