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In many study systems, populations fluctuate synchronously across large regions. Several mechanisms have been advanced to explain this, but their importance in nature is often uncertain. Theoretical studies suggest that spatial synchrony initiated in one species through Moran effects may propagate among trophically linked species, but evidence for this in nature is lacking. By applying the nonparametric spatial correlation function to time series data, we discover that densities of the gypsy moth, the moth's chief predator (the white‐footed mouse), and the mouse's winter food source (red oak acorns) fluctuate synchronously over similar distances (∼1000 km) and with similar levels of synchrony. In addition, we investigate the importance of consumer–resource interactions in propagating synchrony among species using an empirically informed simulation model of interactions between acorns, the white‐footed …