Delphinid echolocation click detection probability on near-seafloor sensors

TitleDelphinid echolocation click detection probability on near-seafloor sensors
Publication TypeJournal Article
Year of Publication2016
AuthorsFrasier K.E, Wiggins SM, Harris D., Marques T.A, Thomas L., Hildebrand JA
JournalJournal of the Acoustical Society of America
Volume140
Pagination1918-1930
Date Published2016/09
Type of ArticleArticle
ISBN Number0001-4966
Accession NumberWOS:000386932500051
Keywordsbottle-nosed-dolphin; diving behavior; grampus-griseus; gulf-of-mexico; lagenorhynchus-albirostris; passive acoustic detection; pattern; pseudorca-crassidens; spotted dolphins; stenella-frontalis; transmission beam
Abstract

The probability of detecting echolocating delphinids on a near-seafloor sensor was estimated using two Monte Carlo simulation methods. One method estimated the probability of detecting a single click (cue counting); the other estimated the probability of detecting a group of delphinids (group counting). Echolocation click beam pattern and source level assumptions strongly influenced detectability predictions by the cue counting model. Group detectability was also influenced by assumptions about group behaviors. Model results were compared to in situ recordings of encounters with Risso's dolphin (Grampus griseus) and presumed pantropical spotted dolphin (Stenella attenuata) from a near-seafloor four-channel tracking sensor deployed in the Gulf of Mexico (25.537 degrees N 84.632 degrees W, depth 1220 m). Horizontal detection range, received level and estimated source level distributions from localized encounters were compared with the model predictions. Agreement between in situ results and model predictions suggests that simulations can be used to estimate detection probabilities when direct distance estimation is not available. (C) 2016 Acoustical Society of America.

DOI10.1121/1.4962279
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