Intraspecific trait variability (ITV) is an important aspect of community ecology, but we still have a poor understanding of what drives the magnitude of relationships between ITV and ecological dynamics. In order to guide ecologists interested in unravelling the ecological implications of ITV, we asked whether relationships’ magnitudes differ (i) between intraspecific levels (among-vs. within- populations), (ii) among ecological responses spanning levels of biological organization (from individ