02298nas a2200253   4500008004100000245011100041210006900152520150700221653001701728653001501745653001701760653001201777653001901789653001601808653003201824653001601856653001801872100002001890700001901910700002301929700002601952700002201978856004402000       2022                        eng d00aTemporal occurrence of three blue whale populations in New Zealand waters from passive acoustic monitoring0 aTemporal occurrence of three blue whale populations in New Zeala3 a<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>
10abioacoustics10ablue whale10adistribution10aecology10amarine mammals10aNew Zealand10apassive acoustic monitoring10apopulations10avocalizations1 aBarlow, Dawn, R1 aKlinck, Holger1 aPonirakis, Dimitri1 aColberg, Mattea, Holt1 aTorres, Leigh, G.  uhttps://doi.org/10.1093/jmammal/gyac10602268nas a2200277   4500008004100000245006700041210006600108490000600174520133800180653002701518653002601545653002401571653001501595653000901610100002001619700002301639700002501662700002101687700002601708700002301734700002301757700002601780700002701806700001901833856013801852       2018                        eng d00aContext-dependent variability in blue whale acoustic behaviour0 aContextdependent variability in blue whale acoustic behaviour0 v53 a<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>
10aacoustic communication10aBalaenoptera musculus10abehavioural context10ablue whale10asong1 aLewis, Leah, A.1 aCalambokidis, John1 aStimpert, Alison, K.1 aFahlbusch, James1 aFriedlaender, Ari, S.1 aMcKenna, Megan, F.1 aMesnick, Sarah, L.1 aSouthall, Brandon, L.1 aSzesciorka, Angela, R.1 aŠirović, Ana  uhttp://rsos.royalsocietypublishing.org/lookup/doi/10.1098/rsos.180241https://syndication.highwire.org/content/doi/10.1098/rsos.180241