Summary of flight parameters.

<p>Table of sample sizes, predicted means and 95% confidence intervals (C.I.) of the analysed flight characteristics, and statistics for homed bees, non-returning bees and the total dataset. Parameters were compared using linear mixed models (LMM) fitted by restricted maximum likelihood (REML), with a crossed fixed model (treatment × homing success) and a nested random model (tracking day × bee). Denominator degrees of freedom (<i>d.d.f.</i>) are reported individually whereas the test-wide unvaried nominator degree of freedom (<i>n.d.f.</i>) is given in the heading. Parameters marked with an asterisk (*) were only for successfully homed bees (see also <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0103989#pone.0103989.s002" target="_blank">Table S1</a>). Parameters marked with two asterisks (**) were assessed excluding composite tracks (<i>n</i> = 3) consisting of two sub-tracks recorded over a long period of time i.e. putative non-returning bees re-emerging on the radar screen after a long period of discontinuous radar-tracking (tracking of other bees interspersed with non-tracking times while bees were prepared and displaced), characterized by one very long putative stop separating the two track-components.