The independent contributions (%) of the variables to the population densities.

<p>Contributions were calculated in the hierarchical partitioning analysis. Variables that had the strongest statistically significant (<i>P</i> < 0.05) impact on the local densities of (a) <i>Phengaris teleius</i> and (b) <i>P</i>. <i>nausithous</i> are shown with gray bars.</p

Landscape structure of the studied regions in Kraków and Tarnów, southern Poland.

<p>Landscape structure of the studied regions in Kraków and Tarnów, southern Poland.</p

Occupation rates and metapopulation sizes of <i>Phengaris teleius</i> and <i>P</i>. <i>nausithous</i> butterflies.

<p>Occupation rates and metapopulation sizes of <i>Phengaris teleius</i> and <i>P</i>. <i>nausithous</i> butterflies.</p

Estimates of the function slopes of variables present in the most parsimonious models describing bee, butterfly and hoverfly species richness and abundance by variables on railway embankments.

<p>Standard errors (SE) and 95% confidence limits (CL) are also presented. Name of variables as in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0101297#pone-0101297-t002" target="_blank">Tab. 2</a>.</p

Independent variables measured on embankment sites.

<p>Mean ± standard deviation (SD) with minimum and maximum values are shown.</p

Map indicating the location of the study sites in the Kraków region, SE Poland.

<p>Map indicating the location of the study sites in the Kraków region, SE Poland.</p

Mean (±SD) pollinator species richness (a) and abundance (b) on railway embankments (closed bars) and grasslands (open bars).

<p>***P<0.001.</p