Fig. 3

A scatter plot of urbanization versus microbial OTU richness found in the nectar of the 20 Linaria vulgaris populations located across an urbanization gradient in the vicinity of Leuven, Belgium. Urbanization was measured as an impervious surface percentage within a 500 m radius from each sampled population. Bacterial OTUs were defined as sequence clusters exhibiting at least 1 % dissimilarity from each other, and presented red squares while yeast OTUs were defined as sequence clusters exhibiting at least 3 % dissimilarity from each other, and presented as blue circles. There was no correlation between bacterial nor yeast OTU richness and urbanization