Determining dominant scatterers of sound in mixed zooplankton populations

View/ Open
Date
2007-12Author
Lavery, Andone C.
Concept link
Wiebe, Peter H.
Concept link
Stanton, Timothy K.
Concept link
Lawson, Gareth L.
Concept link
Benfield, Mark C.
Concept link
Copley, Nancy J.
Concept link
Metadata
Show full item recordCitable URI
https://hdl.handle.net/1912/2341As published
https://doi.org/10.1121/1.2793613DOI
10.1121/1.2793613Abstract
High-frequency acoustic scattering techniques have been used to investigate dominant scatterers in mixed zooplankton populations. Volume backscattering was measured in the Gulf of Maine at 43, 120, 200, and 420 kHz. Zooplankton composition and size were determined using net and video sampling techniques, and water properties were determined using conductivity, temperature, and depth sensors. Dominant scatterers have been identified using recently developed scattering models for zooplankton and microstructure. Microstructure generally did not contribute to the scattering. At certain locations, gas-bearing zooplankton, that account for a small fraction of the total abundance and biomass, dominated the scattering at all frequencies. At these locations, acoustically inferred size agreed well with size determined from the net samples. Significant differences between the acoustic, net, and video estimates of abundance for these zooplankton are most likely due to limitations of the net and video techniques. No other type of biological scatterer ever dominated the scattering at all frequencies. Copepods, fluid-like zooplankton that account for most of the abundance and biomass, dominated at select locations only at the highest frequencies. At these locations, acoustically inferred abundance agreed well with net and video estimates. A general approach for the difficult problem of interpreting high-frequency acoustic scattering in mixed zooplankton populations is described.
Description
Author Posting. © Acoustical Society of America, 2007. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 122 (2007): 3304-3326, doi:10.1121/1.2793613.
Collections
Suggested Citation
Journal of the Acoustical Society of America 122 (2007): 3304-3326Related items
Showing items related by title, author, creator and subject.
-
Differences between sound scattering by weakly scattering spheres and finite-length cylinders with applications to sound scattering by zooplankton
Stanton, Timothy K.; Wiebe, Peter H.; Chu, Dezhang (Acoustical Society of America, 1998-01)A modeling study was conducted to determine the conditions under which fluidlike zooplankton of the same volume but different shapes (spherical/cylindrical) have similar or dramatically different scattering properties. ... -
Sound scattering by several zooplankton groups. I. Experimental determination of dominant scattering mechanisms
Stanton, Timothy K.; Chu, Dezhang; Wiebe, Peter H.; Martin, Linda V.; Eastwood, Robert L. (Acoustical Society of America, 1998-01)The acoustic scattering properties of live individual zooplankton from several gross anatomical groups have been investigated. The groups involve (1) euphausiids (Meganyctiphanes norvegica) whose bodies behave acoustically ... -
Sound scattering by several zooplankton groups. II. Scattering models
Stanton, Timothy K.; Chu, Dezhang; Wiebe, Peter H. (Acoustical Society of America, 1998-01)Mathematical scattering models are derived and compared with data from zooplankton from several gross anatomical groups—fluidlike, elastic shelled, and gas bearing. The models are based upon the acoustically inferred ...