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. 2016 May 11;283(1830):20153027. doi: 10.1098/rspb.2015.3027

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© 2016 The Author(s)

Published by the Royal Society. All rights reserved.

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Figure 4. — Boxplots showing the link between the ability of genera to cross the tropical/temperate boundary and their species richness. Bridge genera have significantly more species within the tropics (TSB) than genera limited to the tropics (TG), and are significantly more species-rich within the extratropics (ESB) than genera limited to the extratropics (EG, Wilcoxon rank sum test, see text). Black points within the boxplots represent mean per-genus species richness with 95% bootstrapped confidence intervals. TG, tropical genera; TSB, tropical-only species of bridge genera; ESB, extratropical-only species of bridge genera; EG, extratropical genera. Numbers in parentheses show the number of genera in each category. The numbers of bridge genera differ between TSB and ESB because some bridge genera contain bridge species and tropical-only species but do not contain extratropical-only species.