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An investigation of avoidance by Antarctic krill of RRS "James Clark Ross" using the Autosub-2 autonomous underwater vehicle

An investigation of avoidance by Antarctic krill of RRS "James Clark Ross" using the Autosub-2 autonomous underwater vehicle
An investigation of avoidance by Antarctic krill of RRS "James Clark Ross" using the Autosub-2 autonomous underwater vehicle
The autonomous underwater vehicle (AUV) Autosub-2 was deployed on eight missions ahead of RRS James Clark Ross in the northern Weddell Sea and in the Bransfield Strait, Southern Ocean, to assess avoidance of the research vessel by Antarctic krill Euphausia superba. The AUV was equipped with the same type of scientific echosounder as the research vessel (Simrad EK500 operating at 38 and 120 kHz) and measured the density of krill along transect acoustically (g m-2 wet mass) prior to the ship's arrival. We hypothesised that if krill avoided the ship, perhaps in response to radiated noise, then the ship should detect less krill than the AUV which is known to have much lower noise levels than the ship. We were unable to detect any significant difference between the density of krill detected by the ship or the AUV, either at the transect level or at finer scales within transects. We conclude, therefore, that avoidance by krill of RRS James Clark Ross will not significantly bias acoustic estimates of krill abundance by this vessel.
acoustic survey, avoidance, autosub, antarctic krill, biomass estimate, euphausia superba, vessel noise
0165-7836
569-576
Brierley, A.S.
845cbcc3-15ce-42b1-aed5-ff5c4a760f19
Fernandes, P.G.
d4dade97-823a-4729-88b8-b8eab8970561
Brandon, M.A.
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Armstrong, F.
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Millard, N.W.
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McPhail, S.D.
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Stevenson, P.
5e0b96d1-1429-4010-a493-ea23a849f46d
Pebody, M.
061eafd0-c200-4701-b465-274140a4602b
Perrett, J.R.
6392a5df-7574-4780-bb36-e5d4d3fd1d11
Squires, M.
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Bone, D.G.
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Griffiths, G.
2887c3c7-95f2-4834-b3f6-0284344d3580
Brierley, A.S.
845cbcc3-15ce-42b1-aed5-ff5c4a760f19
Fernandes, P.G.
d4dade97-823a-4729-88b8-b8eab8970561
Brandon, M.A.
ebede00e-6706-4880-9ecc-3364b9da6a5b
Armstrong, F.
82f7acc4-dccd-4381-9685-e6fbdbf2e96c
Millard, N.W.
49580a7b-9346-484e-80f9-c6ef62e73b65
McPhail, S.D.
58ac4bcd-26a6-4845-8e81-6d6a8f18aed7
Stevenson, P.
5e0b96d1-1429-4010-a493-ea23a849f46d
Pebody, M.
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Perrett, J.R.
6392a5df-7574-4780-bb36-e5d4d3fd1d11
Squires, M.
77858f23-632b-4e95-b392-88a14e3309bd
Bone, D.G.
5ea2480f-9afc-4a79-84ea-dce335d1109a
Griffiths, G.
2887c3c7-95f2-4834-b3f6-0284344d3580

Brierley, A.S., Fernandes, P.G., Brandon, M.A., Armstrong, F., Millard, N.W., McPhail, S.D., Stevenson, P., Pebody, M., Perrett, J.R., Squires, M., Bone, D.G. and Griffiths, G. (2003) An investigation of avoidance by Antarctic krill of RRS "James Clark Ross" using the Autosub-2 autonomous underwater vehicle. Fisheries Research, 60 (2-3), 569-576. (doi:10.1016/S0165-7836(02)00144-3).

Record type: Article

Abstract

The autonomous underwater vehicle (AUV) Autosub-2 was deployed on eight missions ahead of RRS James Clark Ross in the northern Weddell Sea and in the Bransfield Strait, Southern Ocean, to assess avoidance of the research vessel by Antarctic krill Euphausia superba. The AUV was equipped with the same type of scientific echosounder as the research vessel (Simrad EK500 operating at 38 and 120 kHz) and measured the density of krill along transect acoustically (g m-2 wet mass) prior to the ship's arrival. We hypothesised that if krill avoided the ship, perhaps in response to radiated noise, then the ship should detect less krill than the AUV which is known to have much lower noise levels than the ship. We were unable to detect any significant difference between the density of krill detected by the ship or the AUV, either at the transect level or at finer scales within transects. We conclude, therefore, that avoidance by krill of RRS James Clark Ross will not significantly bias acoustic estimates of krill abundance by this vessel.

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Published date: 2003
Keywords: acoustic survey, avoidance, autosub, antarctic krill, biomass estimate, euphausia superba, vessel noise

Identifiers

Local EPrints ID: 1297
URI: http://eprints.soton.ac.uk/id/eprint/1297
ISSN: 0165-7836
PURE UUID: 54a8c7c0-a430-4515-ae88-6a14e04f192e

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Date deposited: 15 Apr 2004
Last modified: 08 Jan 2022 15:41

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Contributors

Author: A.S. Brierley
Author: P.G. Fernandes
Author: M.A. Brandon
Author: F. Armstrong
Author: N.W. Millard
Author: S.D. McPhail
Author: P. Stevenson
Author: M. Pebody
Author: J.R. Perrett
Author: M. Squires
Author: D.G. Bone
Author: G. Griffiths

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