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B E E A N D W A S P R I C H N E S S A N D M A S S - F L O W E R I N G C R O P S 223








Fig. 3 Relation between estimated species richness across the year (a, b) and after mass flowering of oilseed rape (c, d), abundance
of pollinators hatched across the year (e) and after mass flowering of oilseed rape (f), number of undetermined nests of bivoltine first
generations hatched in the field across the year (g) and during mass flowering of oilseed rape (h) with the percentage area of oilseed
rape and/or the percentage area of seminatural habitats. Because in final models for estimated species richness the percentage areas
of oilseed rape and seminatural habitats were retained as significant explanatory variables, residuals of regression models containing
only one of these variables were plotted against the unfitted variable when displaying the relationships between estimated species
richness and these significant landscape variables (a–d).

© 2013 Blackwell Publishing Ltd, GCB Bioenergy, 6, 219–226