Accession Number : AD1029668

Title :   Deep Mapping of Teuthivorous Whales and Their Prey Fields

Descriptive Note : Technical Report,25 Mar 2011,28 Feb 2016


Personal Author(s) : Benoit-Bird,Kelly J ; Moline,Mark A ; Southall,Brandon L

Full Text :

Report Date : 01 Jan 2016

Pagination or Media Count : 35

Abstract : Acoustic echo sounders designed to map and discriminate organisms in the water column have primarily been deployed on ships. Because of acoustic attenuation of higher frequencies used to detect and discriminate micronekton and nekton, this has effectively restricted the range of this information to the upper water column. In an effort to overcome these range limitations by reducing the distance between the transducer and the targets of interest, dual-frequency (38 and 120 kHz) split-beam echo sounders were integrated into a REMUS 600 autonomous underwater vehicle (AUV), more than doubling the range of quantitative acoustic data into the mesopelagic zone (600-1200m). Data from the first set of deployments aimed at describing the predator-prey interactions between deep-diving cetaceans and their prey provide important information for mitigating human interactions with these sensitive species. We show that careful integration of a suite of traditional and novel tools is providing insight into the ecology and dynamics of predator and prey in the bathy- and meso-pelagic.

Descriptors :   Whales , acoustic measurement , data acquisition , sonar

Subject Categories : Biology
      Information Science

Distribution Statement : APPROVED FOR PUBLIC RELEASE