@article {58310, title = {Mark recapture distance sampling: using acoustics to estimate the fraction of dolphins missed by observers during shipboard line-transect surveys}, year = {2020}, abstract = {

Cetacean abundance estimation often relies on distance sampling methods using ship-board visual line-transect surveys, which assumes that all animals on the trackline aredetected and that the detection of animals decreases with increasing distance fromthe trackline. Mark\–Recapture Distance Sampling (MRDS) typically employs a sec-ondary visual observation team and may be used to identify the fraction of animalsdetected on the trackline when it is suspected that animals may have been missed.For species that are difficult to detect using visual observation methods, such as deep-diving species or those with cryptic surfacing behavior, this secondary team may beprone to the same limitations in detection as the primary observation team and alter-native modes of detection may improve estimates. Here we examine the potential useof passive acoustic detection as a secondary platform for MRDS of rough-tootheddolphins (Steno bredanensis) during a combined visual and acoustic shipboard line-transect survey. The average trackline detection probability for rough-toothed dolphinswas less than one for both the trial configuration (averagep(0)0.45 for the visualteam) and independent observer configuration (averagep(0)0.37 for the visual,p(0)0.77 for the acoustic andp(0)0.84 for both teams combined). This study,while limited in scope, strongly suggests that passive acoustic methods may be aneffective alternative for estimatingp(0)for some cetaceans species.

}, doi = {10.1007/s10651-020-00443-7}, url = {http://link.springer.com/10.1007/s10651-020-00443-7}, author = {Rankin, Shannon and Oedekoven, Cornelia and Archer, Frederick} } @article {57409, title = {Acoustic recordings of rough-toothed dolphin ( Steno bredanensis) offshore Eastern Sicily (Mediterranean Sea)}, journal = {The Journal of the Acoustical Society of America}, volume = {146}, year = {2019}, month = {Jan-09-2019}, pages = {EL286 - EL292}, abstract = {

Rough-toothed dolphin\&$\#$39;s abundance and distribution is largely unknown worldwide and evaluation of its conservation status in the Mediterranean Sea is necessary. A rough-toothed dolphin was sighted offshore Eastern Sicily (Mediterranean Sea) in July 2017 and acoustic data were acquired in the same area of Watkins, Tyack, Moore, and Notarbartolo di Sciara [(1987). Mar. Mamm. Sci. 3, 78\–82]. An automatic detection algorithm was developed to identify the echolocation clicks recorded within both datasets and a recurrent inter-click interval value was identified during the new encounter. Distinctive whistle classes were also identified with similar contour shapes within both datasets.

}, issn = {0001-4966}, doi = {10.1121/1.5126118}, url = {http://asa.scitation.org/doi/10.1121/1.5126118}, author = {Caruso, Francesco and Sciacca, Virginia and Parisi, Ignazio and Viola, Salvatore and de Vincenzi, Giovanni and Bocconcelli, Alessandro and Mooney, T. Aran and Li, Songhai and Filiciotto, Francesco and Moulins, Aurelie and Tepsich, Paola and Rosso, Massimiliano} }