01990nas a2200121   4500008004100000245015000041210006900191520148600260100002001746700002401766700002201790856005601812       2020                        eng d00aMark recapture distance sampling: using acoustics to estimate the fraction of dolphins missed by observers during shipboard line-transect surveys0 aMark recapture distance sampling using acoustics to estimate the3 a<p>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&ndash;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.</p>
1 aRankin, Shannon1 aOedekoven, Cornelia1 aArcher, Frederick  uhttp://link.springer.com/10.1007/s10651-020-00443-702101nas a2200265   4500008004100000245012000041210006900161260001600230520128800246653001401534653001701548653001901565653001501584653001301599653002401612653001301636100002001649700002201669700002601691700002201717700002001739700001701759700001601776856004301792       2016                        eng d00aAcoustic classification of dolphins in the California Current using whistles, echolocation clicks, and burst pulses0 aAcoustic classification of dolphins in the California Current us  cJan-12-20163 a<p>Passive acoustic monitoring of dolphins is limited by our ability to classify calls to species. Significant overlap in call characteristics among many species, combined with a wide range of call types and acoustic behavior, makes classification of calls to species challenging. Here, we introduce BANTER, a compound acoustic classification method for dolphins that utilizes information from all call types produced by dolphins rather than a single call type, as has been typical for acoustic classifiers. Output from the passive acoustic monitoring software, PAMGuard, was used to create independent classifiers for whistles, echolocation clicks, and burst pulses, which were then merged into a final, compound classifier for each species. Classifiers for five species found in the California Current ecosystem were trained and tested using 153 single-species acoustic events recorded during a 4.5 mo combined visual and acoustic shipboard cetacean survey off the west coast of the United States. Correct classification scores for individual species ranged from 71% to 92%, with an overall correct classification score of 84% for all five species. The conceptual framework of this approach easily lends itself to other species and study areas as well as to noncetacean taxa.</p>
10aacoustics10aburst pulses10aclassification10adelphinids10adolphins10aecholocation clicks10awhistles1 aRankin, Shannon1 aArcher, Frederick1 aKeating, Jennifer, L.1 aOswald, Julie, N.1 aOswald, Michael1 aCurtis, Alex1 aBarlow, Jay  uhttp://doi.wiley.com/10.1111/mms.12381