@article {58467,
	title = {Temporal occurrence of three blue whale populations in New Zealand waters from passive acoustic monitoring},
	journal = {Journal of Mammalogy},
	year = {2022},
	abstract = {<p>Describing spatial and temporal occurrence patterns of wild animal populations is important for understanding their evolutionary trajectories, population connectivity, and ecological niche specialization, with relevance for effective management. Throughout the world, blue whales produce stereotyped songs that enable identification of separate acoustic populations. We harnessed continuous acoustic recordings from five hydrophones deployed in the South Taranaki Bight (STB) region of Aotearoa New Zealand from January 2016 to February 2018. We examined hourly presence of songs from three different blue whale populations to investigate their contrasting ecological use of New Zealand waters. The New Zealand song was detected year-round with a seasonal cycle in intensity (peak February\&ndash;July), demonstrating the importance of the region to the New Zealand population as both a foraging ground and potential breeding area. The Antarctic song was present in two distinct peaks each year (June\&ndash;July; September\&ndash;October) and predominantly at the offshore recording locations, suggesting northbound and southbound migration between feeding and wintering grounds. The Australian song was only detected during a 10-day period in January 2017, implying a rare vagrant occurrence. We therefore infer that the STB region is the primary niche of the New Zealand population, a migratory corridor for the Antarctic population, and outside the typical range of the Australian population.</p>
},
	keywords = {bioacoustics, blue whale, distribution, ecology, marine mammals, New Zealand, passive acoustic monitoring, populations, vocalizations},
	doi = {10.1093/jmammal/gyac106},
	url = {https://doi.org/10.1093/jmammal/gyac106},
	author = {Dawn R Barlow and Holger Klinck and Dimitri Ponirakis and Mattea Holt Colberg and Leigh G. Torres}
}
@article {53064,
	title = {Context-dependent variability in blue whale acoustic behaviour},
	journal = {Royal Society Open Science},
	volume = {5},
	year = {2018},
	abstract = {<p>Acoustic communication is an important aspect of reproductive, foraging and social behaviours for many marine species. Northeast Pacific blue whales (Balaenoptera musculus) produce three different call types\&mdash;A, B and D calls. All may be produced as singular calls, but A and B calls also occur in phrases to form songs. To evaluate the behavioural context of singular call and phrase production in blue whales, the acoustic and dive profile data from tags deployed on individuals off southern California were assessed using generalized estimating equations. Only 22\% of all deployments contained sounds attributed to the tagged animal. A larger proportion of tagged animals were female (47\%) than male (13\%), with 40\% of unknown sex. Fifty per cent of tags deployed on males contained sounds attributed to the tagged whale, while only a few (5\%) deployed on females did. Most calls were produced at shallow depths (less than 30\&thinsp;m). Repetitive phrasing (singing) and production of singular calls were most common during shallow, non-lunging dives, with the latter also common during surface behaviour. Higher sound production rates occurred during autumn than summer and they varied with time-of-day: singular call rates were higher at dawn and dusk, while phrase production rates were highest at dusk and night.</p>
},
	keywords = {acoustic communication, Balaenoptera musculus, behavioural context, blue whale, song},
	doi = {10.1098/rsos.180241},
	url = {http://rsos.royalsocietypublishing.org/lookup/doi/10.1098/rsos.180241https://syndication.highwire.org/content/doi/10.1098/rsos.180241},
	author = {Lewis, Leah A. and Calambokidis, John and Stimpert, Alison K. and Fahlbusch, James and Friedlaender, Ari S. and McKenna, Megan F. and Mesnick, Sarah L. and Southall, Brandon L. and Szesciorka, Angela R. and {\v S}irovi{\'c}, Ana}
}
