Vertical distribution, composition and migratory patterns of acoustic scattering layers in the Canary Islands

Handle URI:
http://hdl.handle.net/10754/594711
Title:
Vertical distribution, composition and migratory patterns of acoustic scattering layers in the Canary Islands
Authors:
Ariza, A.; Landeira, J.M.; Escánez, A.; Wienerroither, R.; Aguilar de Soto, N.; Røstad, Anders ( 0000-0002-2512-9033 ) ; Kaartvedt, S.; Hernández-León, S.
Abstract:
Diel vertical migration (DVM) facilitates biogeochemical exchanges between shallow waters and the deep ocean. An effective way of monitoring the migrant biota is by acoustic observations although the interpretation of the scattering layers poses challenges. Here we combine results from acoustic observations at 18 and 38 kHz with limited net sampling in order to unveil the origin of acoustic phenomena around the Canary Islands, subtropical northeast Atlantic Ocean. Trawling data revealed a high diversity of fishes, decapods and cephalopods (152 species), although few dominant species likely were responsible for most of the sound scattering in the region. We identified four different acoustic scattering layers in the mesopelagic realm: (1) at 400–500 m depth, a swimbladder resonance phenomenon at 18 kHz produced by gas-bearing migrant fish such as Vinciguerria spp. and Lobianchia dofleini, (2) at 500–600 m depth, a dense 38 kHz layer resulting primarily from the gas-bearing and non-migrant fish Cyclothone braueri, and to a lesser extent, from fluid-like migrant fauna also inhabiting these depths, (3) between 600 and 800 m depth, a weak signal at both 18 and 38 kHz ascribed either to migrant fish or decapods, and (4) below 800 m depth, a weak non-migrant layer at 18 kHz which was not sampled. All the dielly migrating layers reached the epipelagic zone at night, with the shorter-range migrations moving at 4.6 ± 2.6 cm s − 1 and the long-range ones at 11.5 ± 3.8 cm s − 1. This work reduces uncertainties interpreting standard frequencies in mesopelagic studies, while enhances the potential of acoustics for future research and monitoring of the deep pelagic fauna in the Canary Islands.
KAUST Department:
Red Sea Research Center (RSRC)
Citation:
Vertical distribution, composition and migratory patterns of acoustic scattering layers in the Canary Islands 2016 Journal of Marine Systems
Publisher:
Elsevier BV
Journal:
Journal of Marine Systems
Issue Date:
21-Jan-2016
DOI:
10.1016/j.jmarsys.2016.01.004
Type:
Article
ISSN:
09247963
Additional Links:
http://linkinghub.elsevier.com/retrieve/pii/S0924796316000178
Appears in Collections:
Articles; Red Sea Research Center (RSRC)

Full metadata record

DC FieldValue Language
dc.contributor.authorAriza, A.en
dc.contributor.authorLandeira, J.M.en
dc.contributor.authorEscánez, A.en
dc.contributor.authorWienerroither, R.en
dc.contributor.authorAguilar de Soto, N.en
dc.contributor.authorRøstad, Andersen
dc.contributor.authorKaartvedt, S.en
dc.contributor.authorHernández-León, S.en
dc.date.accessioned2016-01-24T10:18:02Zen
dc.date.available2016-01-24T10:18:02Zen
dc.date.issued2016-01-21en
dc.identifier.citationVertical distribution, composition and migratory patterns of acoustic scattering layers in the Canary Islands 2016 Journal of Marine Systemsen
dc.identifier.issn09247963en
dc.identifier.doi10.1016/j.jmarsys.2016.01.004en
dc.identifier.urihttp://hdl.handle.net/10754/594711en
dc.description.abstractDiel vertical migration (DVM) facilitates biogeochemical exchanges between shallow waters and the deep ocean. An effective way of monitoring the migrant biota is by acoustic observations although the interpretation of the scattering layers poses challenges. Here we combine results from acoustic observations at 18 and 38 kHz with limited net sampling in order to unveil the origin of acoustic phenomena around the Canary Islands, subtropical northeast Atlantic Ocean. Trawling data revealed a high diversity of fishes, decapods and cephalopods (152 species), although few dominant species likely were responsible for most of the sound scattering in the region. We identified four different acoustic scattering layers in the mesopelagic realm: (1) at 400–500 m depth, a swimbladder resonance phenomenon at 18 kHz produced by gas-bearing migrant fish such as Vinciguerria spp. and Lobianchia dofleini, (2) at 500–600 m depth, a dense 38 kHz layer resulting primarily from the gas-bearing and non-migrant fish Cyclothone braueri, and to a lesser extent, from fluid-like migrant fauna also inhabiting these depths, (3) between 600 and 800 m depth, a weak signal at both 18 and 38 kHz ascribed either to migrant fish or decapods, and (4) below 800 m depth, a weak non-migrant layer at 18 kHz which was not sampled. All the dielly migrating layers reached the epipelagic zone at night, with the shorter-range migrations moving at 4.6 ± 2.6 cm s − 1 and the long-range ones at 11.5 ± 3.8 cm s − 1. This work reduces uncertainties interpreting standard frequencies in mesopelagic studies, while enhances the potential of acoustics for future research and monitoring of the deep pelagic fauna in the Canary Islands.en
dc.language.isoenen
dc.publisherElsevier BVen
dc.relation.urlhttp://linkinghub.elsevier.com/retrieve/pii/S0924796316000178en
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Journal of Marine Systems. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Marine Systems, 21 January 2016. DOI: 10.1016/j.jmarsys.2016.01.004en
dc.subjectDiel Vertical Migrationen
dc.subjectmesopelagicen
dc.subjectDeep Scattering Layeren
dc.subjectmicronektonen
dc.subjectswimbladder resonanceen
dc.titleVertical distribution, composition and migratory patterns of acoustic scattering layers in the Canary Islandsen
dc.typeArticleen
dc.contributor.departmentRed Sea Research Center (RSRC)en
dc.identifier.journalJournal of Marine Systemsen
dc.eprint.versionPost-printen
dc.contributor.institutionInstituto de Oceanografía y Cambio global, Universidad de Las Palmas de Gran Canaria, Las Palmas, Spainen
dc.contributor.institutionGraduate School of Fisheries Sciences, Hokkaido University, Hakodate, Japanen
dc.contributor.institutionDepartamento de Ecoloxía e Bioloxía Animal, Universidad de Vigo, Vigo, Spainen
dc.contributor.institutionInstitute of Marine Research, Bergen, Norwayen
dc.contributor.institutionDepartamento de Biología Animal, Edafología y Geología, Universidad de La Laguna, Santa Cruz de Tenerife, Spainen
dc.contributor.institutionDepartment of Biosciences, University of Oslo, Oslo, Norwayen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorRøstad, Andersen
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