Distribution of observed (o) and predicted (line) number of <i>P. melanarius</i> recaptured along the length of the experimental field, cumulated over time and over the width of the field for (a) beetles released in oilseed radish at 50 m and (b) beetles released in rye at 70 m. Predicted values are simulated with the model that had most support from the data (model 1, Table 1).

<p>The error-bars show the 95% CI of the observations. Averaging of densities at a given <i>x</i> was done over all traps at that <i>x</i>-value. At x = 50 and 70 m, there were no traps close to the release points, causing a drop in the catch, both in the data and the fitted model. Cf. <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0115751#pone-0115751-g001" target="_blank">Fig. 1</a> for trap locations.