Table 3 Results for the selection of nectar sources of Boloria pales using Jacobs’ index of selection (Jacobs 1974; interpretational classification of Jacobs` index for our study: 1 to 0.33 preference, 0.33 to − 0.33 neutrality, − 0.33 to −1 avoidance) and Bailey’s confidence intervals at p value < 0.05 (Bailey, 1980; Cherry, 1996); rating: “+” preference nectar source, “=” neutrality, “-”avoidance
Category | Observed visits | Proportion expected | Proportion used | Jacobs` index | Jacobs` index rating | Bailey’s confidence intervals | Bailey’s confidence intervals rating | |
|---|---|---|---|---|---|---|---|---|
Plant family | ||||||||
Males | Asteraceae | 84 | 0.208 | 0.903 | 0.945 | + | (0.744;0.969) | + |
Caprifoliaceae | 9 | 0.035 | 0.097 | 0.495 | + | (0.020;0.226) | = | |
Females | Asteraceae | 25 | 0.208 | 0.284 | 0.204 | = | (0.139;0.460) | = |
Caprifoliaceae | 61 | 0.035 | 0.693 | 0.968 | + | (0.514;0.843) | + | |
Plant genera | ||||||||
Males | Hieracium (Asteraceae) | 73 | 0.245 | 0.785 | 0.837 | + | (0.604;0.895) | + |
Leontodon (Asteraceae) | 11 | 0.112 | 0.118 | 0.029 | = | (0.030;0.254) | = | |
Scabiosa (Caprifoliaceae) | 9 | 0.106 | 0.097 | −0.049 | = | (0.020;0.226) | = | |
Females | Carduus (Asteraceae) | 2 | 0.081 | 0.023 | −0.578 | – | (0.001;0.122) | = |
Carlina (Asteraceae) | 1 | 0.062 | 0.012 | −0.690 | – | (0.005;0.099) | = | |
Hieracium (Asteraceae) | 14 | 0.245 | 0.163 | −0.250 | = | (0.052;0.316) | = | |
Leontodon (Asteraceae) | 8 | 0.112 | 0.093 | −0.103 | = | (0.016;0.227) | = | |
Scabiosa (Caprifoliaceae) | 61 | 0.106 | 0.709 | 0.907 | + | (0.514;0.843) | + | |