Table 2. Values of the specialisation index d′ of male and female syrphids.

Larger values of the d′ index correspond to more specialised flower visitation. Species where one or both sexes had <5 observations were excluded from the analysis.

	Specialisation (d′)
Species	Females	Males
Chrysogaster solstitialis	0.43	0.41
Episyrphus balteatus	0.27	0.26
Eristalis arbustorum	0.29	0.28
Eristalis nemorum	0.27	0.26
Lapposyrphus lapponicus	0.17	0.23
Melanostoma mellinum	0.25	0.17
Pipizella viduata	0.27	0.28
Sericomyia silentis	0.34	0.29
Sphaerophoria scripta	0.13	0.17
Syritta pipiens	0.23	0.27
Syrphus ribesii	0.17	0.23
Syrphus torvus	0.16	0.26
Syrphus vitripennis	0.12	0.17