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Comparison of blue whale call production on (a) days with and without seismic operations and (b) during periods within those seismic operation days when sparker pulses were and were not detected; ***GLM (quasi-Poisson), p < 0.001. (c) Calling activity during adjacent 1 h no-seismic and 1 h seismic blocks. Bold line indicates two occurrences with the same vocal change.
