Grace, Jon, and Jeff tackle a recent paper in Ecology (Pillai and Gouhier, 2019) that claims that the "positive" effect of biodiversity on ecosystem functioning is vastly overstated. The gang talk about the background and context of the paper, including neutral theory, competitive exclusion, and complementarity, while also revisiting some classic ecology work from Tilman and Huston. Also, March Mammal Madness is coming soon!