Natural stimuli display spatiotemporal characteristics that typically vary over orders of magnitude and their encoding by sensory neurons remains poorly understood. We investigated population coding of highly heterogeneous natural electro-communication stimuli in Apteronotus leptorhynchus of either sex. Neuronal activities were positively correlated with one another in the absence of stimulation and that correlation magnitude decayed with increasing distance between recording sites. Under stimulation, we found that correlations between trial-averaged neuronal responses (i.e., signal correlations) were positive and higher in magnitude for neurons located close to another, but that correlations between the trial-to-trial variability (i.e., noise correlations) were independent of physical distance. Overall, signal and noise correlations were independent of stimulus waveform as well as of one another. To investigate how neuronal populations encoded natural electro-communication stimuli, we considered a nonline...