Non-metric multidimensional scaling ordination (nMDS) of the major pollen taxa in Australia and New Zealand.

<p>(<b>A</b>) Distribution of urban areas using a matrix of percentage representation of major pollen taxa (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0097925#pone-0097925-t002" target="_blank">Table 2</a> and using top eight pollen taxa at each site). The pie charts depict the relative contribution of the most abundant pollen taxa in each urban area. (<b>B</b>) Distribution of pollen taxa contributing to the differentiation of aerobiology of each urban area Note: coloured squares associated with each taxa depicted in (B) match the pie chart colours shown in (A), with diamonds showing taxa with a low percentage representation. The vectors (dotted lines) for the environmental variables show positions for each variable within the environmental space. Longer vectors (higher r² values, see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0097925#pone-0097925-t003" target="_blank">Table 3</a>) indicate a stronger association of the environmental variable with site/species variation in the ordination space.