Twilight vertical migrations of zooplankton in a Chilean fjord

Time series of acoustic backscatter and vertical velocity profiles were obtained at three sites along a Chilean fjord with the purpose of determining dominant structures of vertical migrations of the sound scattering layer. Ancillary data obtained with stratified net samples indicated that the sound...

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Bibliographic Details
Published in:Progress in oceanography 2014-12, Vol.129, p.114-124
Main Authors: Valle-Levinson, Arnoldo, Castro, Leonardo, Cáceres, Mario, Pizarro, Oscar
Format: Article
Language:English
Subjects:
Acoustics
Backscattering
Fjords
Marine
Migration
Organisms
Scattering
Sunset
Twilight
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Summary:Time series of acoustic backscatter and vertical velocity profiles were obtained at three sites along a Chilean fjord with the purpose of determining dominant structures of vertical migrations of the sound scattering layer. Ancillary data obtained with stratified net samples indicated that the sound scattering layer may have been dominated by euphausiids and decapods. Therefore, distributions of acoustic backscatter anomalies and vertical velocities were attributed to vertical migrations of predominantly these organisms. Migration patterns were dominated by twilight excursions in which organisms swam toward the water surface at sunset, spent
ISSN:0079-6611
1873-4472
DOI:10.1016/j.pocean.2014.03.008