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Differences in backscattering strength determined at 120 and 38 kHz for three species of Antarctic macroplankton

Madureira, L.S.P.; Ward, Peter; Atkinson, Angus. 1993 Differences in backscattering strength determined at 120 and 38 kHz for three species of Antarctic macroplankton. Marine Ecology Progress Series, 93. 17-24. https://doi.org/10.3354/meps093017

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Abstract/Summary

The ability to acoustically separate zooplankton species is an important requirement for ecological studies and to improve biomass estimates. In order to distinguish between Euphausia superba and other swarm-forming macroplankters we used a dual frequency echo-sounder (120 and 38 kHz) and echo-integrator during a series of Longhurst Hardy Plankton Recorder (LHPR) hauls near South Georgia. We compared the acoustic parameter Mean Volume Backscattering Strength (MVBS) according to the equation: DELTAMVBS (dB) = MVBS 120 kHz - MVBS 38 kHz. Mean values of DELTAMVBS for E. superba, Themisto gaudichaudii and E. frigida were 4.6, 9.7 and 15.6 dB, respectively, and were significantly different, allowing the 3 species to be separated acoustically.

Item Type: Publication - Article
Digital Object Identifier (DOI): https://doi.org/10.3354/meps093017
ISSN: 0171-8630
Date made live: 26 Sep 2017 08:40 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/517897

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