Drought and bleaching impacts on tropical biodiversity-ecosystem functioning links, functional richness and functional dispersion in tropical forests and coral reefs, respectively. Dung beetle (a–d) and herbivore parrotfish communities (e–h) were surveyed before (purple) and after (blue) the 2015/2016 El Niño drought within Brazilian Amazonian forests and heatwave in Seychelles reefs, respectively. The x-axis shows dung beetle (a,b) and parrotfish (e–f) species richness, and pre- and post-drought/heatwave surveys (c,d/g,h). The y-axis represents rates of dung beetle-mediated secondary seed dispersal (a,b), parrotfish grazing rates (e,f), functional richness (c,g) and functional dispersion (d,h). Further details on functional traits, analyses and results are described in the electronic supplementary material. (Online version in colour.)