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/gyac10602011nas a2200253   4500008004100000022001400041245012800055210006900183260001600252300001400268490000700282520121100289653002101500653001101521653001201532653001501544653002101559653002101580100002401601700002301625700002101648700002601669856006201695       2018                        eng d  a0022-237200aThe acoustic gymnastics of the dwarf dog-faced bat (Molossops temminckii) in environments with different degrees of clutter0 aacoustic gymnastics of the dwarf dogfaced bat Molossops temminck  cNov-29-2018  a965 - 9730 v993 a<p>Molossops temminckii is the only species of the Molossidae capable of exploring background-cluttered space. We tested the hypothesis that M. temminckii uses the clutter rejection strategy in cluttered environments and determined whether the echolocation calls of this species show large-scale geographic variation. We recorded echolocation calls of 10 individuals of M. temminckii using 4 treatments with different degrees of clutter. We compared individuals recorded in Venezuela with individuals recorded in Brazil to verify geographic variation in calls. In the cluttered environments, M. temminckii emitted short downward frequency-modulated calls with short pulse intervals. In the uncluttered environments, M. temminckii emitted long upward frequency-modulated calls with longer intervals and shorter bandwidth. The decreased pulse duration and interval in cluttered environments support the hypothesis that M. temminckii uses the clutter rejection strategy. Additionally, we found that in Brazil, M. temminckii emits shorter calls with higher minimum frequency compared with bats recorded in Venezuela, indicating large-scale geographic variation, probably because of environmental factors.</p>
10abat echolocation10aBrazil10aCerrado10aMolossidae10avocal plasticity10avocal repertoire1 aOliveira, Thiago, F1 aRamalho, Daniel, F1 aMora, Emanuel, C1 aAguiar, Ludmilla, M S  uhttps://academic.oup.com/jmammal/article/99/4/965/5071805