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Please use this identifier to cite or link to this item: http://hdl.handle.net/10023/1652
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Title: Density estimation implications of increasing ambient noise on beaked whale click detection and classification
Authors: Marques, Tiago Andre Lamas Oliveira
Ward, Jessica
Jarvis, Susan
Moretti, David
Morrissey, Ronald
DiMarzio, Nancy
Thomas, Len
Keywords: QC Physics
GC Oceanography
Issue Date: 2010
Citation: Marques , T A L O , 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 .
Series/Report no.: CREEM Technical Report
Abstract: Acoustic 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.
Version: Other
URI: http://hdl.handle.net/10023/1652
http://creem2.st-andrews.ac.uk/reports/
Type: Report
Publisher: University of St Andrews
Appears in Collections:Centre for Research into Ecological & Environmental Modelling (CREEM) Technical report series
University of St Andrews Research
Mathematics & Statistics Research
Centre for Research into Ecological & Environmental Modelling (CREEM) Research
Scottish Oceans Institute Research



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