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dc.contributor.authorGuihen, Damien
dc.contributor.authorFielding, Sophie
dc.contributor.authorMurphy, Eugene J.
dc.contributor.authorHeywood, Karen J.
dc.contributor.authorGriffiths, Gwyn
dc.coverage.spatialWeddell Seaen_US
dc.date.accessioned2019-04-02T19:59:45Z
dc.date.available2019-04-02T19:59:45Z
dc.date.issued2014
dc.identifier.citationGuihen, D.; Fielding, S.; Murphy, E.J.; Heywood, K.J. and Griffiths, G. (2014) An assessment of the use of ocean gliders to undertake acoustic measurements of zooplankton: the distribution and density of Antarctic krill (Euphausia superba) in the Weddell Sea. Limnology and Oceanography Methods, 12, pp.373-389, DOI: https://doi.org/10.4319/lom.2014.12.373en_US
dc.identifier.urihttp://hdl.handle.net/11329/895
dc.identifier.urihttp://dx.doi.org/10.25607/OBP-441
dc.description.abstractA calibrated 120 kHz single‐beam echo‐sounder was integrated into an ocean glider and deployed in the Weddell Sea, Southern Ocean. The glider was deployed for two short periods in January 2012, in separate survey boxes on the continental shelf to the east of the Antarctic Peninsula, to assess the distribution of Antarctic krill (Euphausia superba). During the glider missions, a research vessel undertook acoustic transects using a calibrated, hull‐mounted, multi‐frequency echo‐sounder. Net hauls were taken to validate acoustic targets and parameterize acoustic models. Krill targets were identified using a thresholded schools analysis technique (SHAPES), and acoustic data were converted to krill density using the stochastic distorted‐wave Born approximation (SDWBA) target strength model. A sensitivity analysis of glider pitch and roll indicated that, if not taken into account, glider orientation can impact density estimates by up to 8‐fold. Glider‐based, echo‐sounder—derived krill density profiles for the two survey boxes showed features coherent with ship‐borne measurements, with peak densities in both boxes around a depth of 60 m. Monte Carlo simulation of glider subsampling of ship‐borne data showed no significant difference from observed profiles. Simulated glider dives required at least an order of magnitude more time than the ship to similarly estimate the abundance of krill within the sample regions. These analyses highlight the need for suitable sampling strategies for glider‐based observations and are our first steps toward using autonomous underwater vehicles for ecosystem assessment and long‐term monitoring. With appropriate survey design, gliders can be used for estimating krill distribution and abundance.en_US
dc.language.isoenen_US
dc.rightsAttribution 4.0*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subject.otherEchosounderen_US
dc.subject.otherOcean glideren_US
dc.titleAn assessment of the use of ocean gliders to undertake acoustic measurements of zooplankton: the distribution and density of Antarctic krill (Euphausia superba) in the Weddell Sea.en_US
dc.typeJournal Contributionen_US
dc.description.refereedRefereeden_US
dc.format.pagerangepp.373-389en_US
dc.identifier.doihttps://doi.org/10.4319/lom.2014.12.373
dc.subject.parameterDisciplineParameter Discipline::Biological oceanography::Other biological measurementsen_US
dc.subject.instrumentTypeInstrument Type Vocabulary::acoustic backscatter sensorsen_US
dc.bibliographicCitation.titleLimnology and Oceanography Methodsen_US
dc.bibliographicCitation.volume12en_US
dc.bibliographicCitation.issue6en_US
dc.description.eovZooplankton biomass and diversityen_US
dc.description.bptypeGuideen_US
obps.contact.contactemaildamaoi@bas.ac.uk
obps.resourceurl.publisherhttps://aslopubs.onlinelibrary.wiley.com/doi/10.4319/lom.2014.12.373en_US


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Attribution 4.0
Except where otherwise noted, this item's license is described as Attribution 4.0