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dc.contributor.authorMarques, Tiago A.
dc.contributor.authorWard, Jessica
dc.contributor.authorJarvis, Susan
dc.contributor.authorMoretti, David
dc.contributor.authorMorrissey, Ronald
dc.contributor.authorDiMarzio, Nancy
dc.contributor.authorThomas, Len
dc.identifier.citationMarques , T A , Ward , J , Jarvis , S , Moretti , D , Morrissey , R , DiMarzio , N & Thomas , L 2010 , Density estimation implications of increasing ambient noise on beaked whale click detection and classification . CREEM Technical Report , no. 2010-1 , University of St Andrews .en
dc.identifier.otherORCID: /0000-0002-7436-067X/work/29591716
dc.identifier.otherORCID: /0000-0002-2581-1972/work/56861270
dc.description.abstractAcoustic based density estimates are being increasingly used. Usually density estimation methods require one to evaluate the effective survey area of the acoustic sensors, or equivalently estimate the mean detection probability of detecting the animals or cues of interest. This is often done based on an estimated detection function, the probability of detecting an object of interest as a function of covariates, usually distance and additional covariates. If the actual survey data and the data used to estimate a detection function are not collected simultaneously, as in Marques et al. (2009), the estimated detection function might not correspond to the detection process that generated the survey data. This would lead to biaseddensity estimates. Here we evaluate the influence of ambient noise in the detection and classification of beaked whale clicks at the Atlantic Undersea Test and Evaluation Center (AUTEC) hydrophones, to assess if the density estimates reported in Marques et al. (2009) might have been biased. To do so we contaminated a data set with increasing levels of ambient noise, and then estimated the detection function accounting for the noise level as an additional covariate. The results obtained suggest that for the particular results obtained at AUTEC’s deep water hydrophones the influence of ambient noise on the beaked whale’s click detection probability might have been minor, and hence unlikely to have had an impact on density estimates. However, we do not exclude the possibility that the results could be different under other scenarios.
dc.publisherUniversity of St Andrews
dc.relation.ispartofseriesCREEM Technical Reporten
dc.subjectQC Physicsen
dc.subjectGC Oceanographyen
dc.titleDensity estimation implications of increasing ambient noise on beaked whale click detection and classificationen
dc.contributor.institutionUniversity of St Andrews. School of Mathematics and Statisticsen
dc.contributor.institutionUniversity of St Andrews. Scottish Oceans Instituteen
dc.contributor.institutionUniversity of St Andrews. Centre for Research into Ecological & Environmental Modellingen
dc.contributor.institutionUniversity of St Andrews. Marine Alliance for Science & Technology Scotlanden

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