@article {53315, title = {Relationship between cetacean presence, their prey, and oceanographic conditions at an offshore pelagic environment}, journal = {The Journal of the Acoustical Society of America}, volume = {144}, year = {2018}, month = {Jan-09-2018}, pages = {1921 - 1921}, abstract = {

Large mobile predators take advantage of offshore pelagic environments that tend to be surveyed at a low temporal scale. We present results from a one-year observation of passive and active acoustics, as well as oceanographic measures, taken at a moored location 150 nmi offshore southern California in 4000 m deep pelagic waters. The passive acoustic data shows presence of delphinids and baleen, sperm, and beaked whales throughout the recording period with species-specific seasonal occurrence. Variability in small pelagics, krill, and diel vertical migrators is evident from the active acoustic data. Multiple upwelling events and associated changes in dissolved oxygen at 500 m water depth, as well as in surface waters, were also recorded over the year. We will present results on the relationships among oceanographic variability, presence of pelagic species, and top predator presence. This study will provide valuable information on ecosystem processes in meso- and epipelagic waters on a relatively small spatial scale but very fine temporal scale.

}, issn = {0001-4966}, doi = {10.1121/1.5068413}, url = {http://asa.scitation.org/doi/10.1121/1.5068413}, author = {Baumann-Pickering, Simone and Trickey, Jennifer S. and Rice, Ally and {\v S}irovi{\'c}, Ana and Renfree, Josiah and Demer, David A.} } @article {53296, title = {Predator-prey interactions in the Southern California Bight}, journal = {The Journal of the Acoustical Society of America}, volume = {144}, year = {2018}, month = {Jan-09-2018}, pages = {1921 - 1921}, abstract = {

The Southern California Bight (SCB) is an important foraging area for a variety of cetacean species, including blue whales and beaked whales. However, the interactions of these species with their prey (krill and deep-water squid, respectively) can be very difficult to observe. Moorings combining passive and active acoustics were deployed at two locations in the SCB in two consecutive fall and winter seasons. A High-frequency Acoustic Recording Package sampling at 200 kHz recorded the full range of baleen and beaked whale signals. The active acoustic system on each mooring included two Simrad Wide Band Acoustic Transceivers (WBAT). A bottom-mounted WBAT had an upward looking 70 kHz transducer and the one at 300 m depth had upward looking 70 kHz and 200 kHz transducers. Over the course of four months, blue whale songs and social calls were recorded on both moorings. Beaked whale echolocation clicks were commonly detected on the mooring deployed offshore, with only rare beaked whale encounters on the coastal mooring. Backscatter data indicated overlap in the presence of cetacean predators and their prey. Scattering layer dynamics were dominated by regular diel migration, with differences in scatterer abundance between mooring sites, as well as on 2\–5 day time scales.

}, issn = {0001-4966}, doi = {10.1121/1.5068414}, url = {http://asa.scitation.org/doi/10.1121/1.5068414}, author = {{\v S}irovi{\'c}, Ana and Baumann-Pickering, Simone and Warren, Joseph} } @article {53064, title = {Context-dependent variability in blue whale acoustic behaviour}, journal = {Royal Society Open Science}, volume = {5}, year = {2018}, abstract = {

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\—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\ 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.

}, 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} } @article {16647, title = {Management of acoustic metadata for bioacoustics}, journal = {Ecological Informatics}, volume = {31}, year = {2016}, month = {Jan-01-2016}, pages = {122 - 136}, issn = {15749541}, doi = {10.1016/j.ecoinf.2015.12.002}, url = {http://linkinghub.elsevier.com/retrieve/pii/S1574954115001983}, author = {Roch, Marie A. and Batchelor, Heidi and Baumann-Pickering, Simone and Catherine L. Berchok and Cholewiak, Danielle and Fujioka, Ei and Garland, Ellen C. and Herbert, Sean and Sofie M. Van Parijs and Risch, Denise and {\v S}irovi{\'c}, Ana and Soldevilla, Melissa S.} }