Distribution of the specimens of the declining and more stable <i>Bombus</i> spp.

<p>Specimens collected in the Netherlands between the years 1918–1926 before the recent bumblebee declines started (1950–1980), with a picture of each <i>Bombus</i> spp. used in the analysis. Species pictures from [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0127870#pone.0127870.ref056" target="_blank">56</a>]. The letters refer to each sampling location: A = N-Holland, B = Z-Holland, C = Overrijssel, D = Gelderland and E = Limburg. Symbol size refers to the amount of species sampled at that location, while the numbers refer to which species. With for the stable and widespread species: 1 = <i>B</i>. <i>hortorum</i>, 2 = <i>B</i>. <i>lapidarius</i>, 3 = <i>B</i>. <i>pratorum</i>, 4 = <i>B</i>. <i>pascuorum</i>; for the declining and restricted species: 5 = <i>B</i>. <i>humilis</i>, 6 = <i>B</i>. <i>ruderatus</i>, 7 = <i>B</i>. <i>subterraneus</i>, 8 = <i>B</i>. <i>sylvarum</i>, and for the declining and widespread species: 9 = <i>B</i>. <i>muscorum</i>, 10 = <i>B</i>. <i>ruderarius</i>, and 11 = <i>B</i>. <i>veteranus</i>.