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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

From: Dispersal and adaptation strategies of the high mountain butterfly Boloria pales in the Romanian Carpathians

  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) +