Humpback whale adult females and calves balance acoustic contact with vocal crypsis during periods of increased separation

This dataset was collected using animal-borne recording tags and accompanying boat- and land-based visual observations, as well as recordings from a moored hydrophone array. The non-hierarchical partitioning clustering method ‘k-means’ was used to determine adult female-calf behavioural states; a glmer was used to examine whether fine-scale dive parameters of the adult females were significantly different between behavioural states; GLMM's were used to determine if call rate (calls per hour) varied per individual between behavioural states; an lmer was used to determine if adult females modified their received call levels (dB re 1 µPa) in response to the behavioural state of the pair; and a site-specific frequency- and distance-dependent transmission loss equation was used to determine the communication active space of adult female-calf vocal signals, while a glmer was used to determine whether these pairs modified this active space in response to their behavioural state.