Figure 5. Relation between habitat structure and mean body length of bee species and the mean foraging trip duration: (a) Foraging trip duration of O. rufa in different habitat types anova: F = 2·89, n = 41, P = 0·048. (b) Foraging trip duration of O. rufa in relation ▪ to the number of plant species. Linear regression model: y = 1118–7·14 x, F = 9·88, r2 = 59%, n = 7, P = 0·026. Field type symbols: set-aside fields sown with grass–clover mixture, • field margin strips, extensively used grassland, ◆ chalk grassland. (c) Foraging trip duration in relation to the mean body length of eight solitary bee species. Linear regression model: y = −1395 + 244·8x, r2 = 56%, F = 7·77, n = 7, P = 0·032. (d) Foraging trip duration for different solitary bee species. Species on the x-axis were sorted by their mean body length (left small, right large). anova: F = 18·1, n = 72, P < 0·001. Species abbreviations: H.t., H. truncorum; C.r., C. rapunculi; O.l., O. leucomelana; O.p., O. parietina; O.r., O. rufa; O.le., O. leaiana; M.l., M. lapponica; M.v., M. versicolor. In Fig. 5a and d, arithmetic means and standard errors are given. Identical letters show homogeneous groups (Tukey test).
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