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Vertical movements of North Sea cod

VJ Hobson, D Righton, JD Metcalfe, GC Hays, Victoria Hobson

Marine Ecology Progress Series, Volume: 347, Pages: 101 - 110

Swansea University Author: Victoria Hobson

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DOI (Published version): 10.3354/meps07047

Abstract

Various air-breathing marine vertebrates such as seals, turtles and seabirds show distinct patterns of diving behaviour. For fish, the distinction between different vertical behaviours is often less clear-cut, as there are no surface intervals to differentiate between dives. Using data from acoustic...

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Published in: Marine Ecology Progress Series
ISSN: 0171-8630 1616-1599
Published: 2007
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URI: https://cronfa.swan.ac.uk/Record/cronfa6129
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last_indexed 2018-02-09T04:33:00Z
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spelling 2011-10-01T00:00:00.0000000 v2 6129 2011-10-01 Vertical movements of North Sea cod 9024f9f0a80d2d248c7c6efb2e715c37 Victoria Hobson Victoria Hobson true false 2011-10-01 BGPS Various air-breathing marine vertebrates such as seals, turtles and seabirds show distinct patterns of diving behaviour. For fish, the distinction between different vertical behaviours is often less clear-cut, as there are no surface intervals to differentiate between dives. Using data from acoustic tags (n = 23) and archival depth recorders attached to cod Gadus morhua (n = 92) in the southern North Sea, we developed a quantitative method of classifying vertical movements in order to facilitate an objective comparison of the behaviour of different individuals. This method expands the utilisation of data from data storage tags, with the potential for a better understanding of fish behaviour and enhanced individual based behaviour for improved ecosystem modelling. We found that cod were closely associated with the seabed for 90 % of the time, although they showed distinct seasonal and spatial patterns in behaviour. For example, cod tagged in the southern North Sea exhibited high rates of vertical movement in spring and autumn that were probably associated with migration, while the vertical movements of resident cod in other areas were much less extensive and were probably related to foraging or spawning behaviours. The full reasons underlying spatial and temporal behavioural plasticity by cod in the North Sea warrant further investigation. Journal Article Marine Ecology Progress Series 347 101 110 0171-8630 1616-1599 11 10 2007 2007-10-11 10.3354/meps07047 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University 2011-10-01T00:00:00.0000000 2011-10-01T00:00:00.0000000 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences VJ Hobson 1 D Righton 2 JD Metcalfe 3 GC Hays 4 Victoria Hobson 5
title Vertical movements of North Sea cod
spellingShingle Vertical movements of North Sea cod
Victoria Hobson
title_short Vertical movements of North Sea cod
title_full Vertical movements of North Sea cod
title_fullStr Vertical movements of North Sea cod
title_full_unstemmed Vertical movements of North Sea cod
title_sort Vertical movements of North Sea cod
author_id_str_mv 9024f9f0a80d2d248c7c6efb2e715c37
author_id_fullname_str_mv 9024f9f0a80d2d248c7c6efb2e715c37_***_Victoria Hobson
author Victoria Hobson
author2 VJ Hobson
D Righton
JD Metcalfe
GC Hays
Victoria Hobson
format Journal article
container_title Marine Ecology Progress Series
container_volume 347
container_start_page 101
publishDate 2007
institution Swansea University
issn 0171-8630
1616-1599
doi_str_mv 10.3354/meps07047
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Biosciences{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Biosciences
document_store_str 0
active_str 0
description Various air-breathing marine vertebrates such as seals, turtles and seabirds show distinct patterns of diving behaviour. For fish, the distinction between different vertical behaviours is often less clear-cut, as there are no surface intervals to differentiate between dives. Using data from acoustic tags (n = 23) and archival depth recorders attached to cod Gadus morhua (n = 92) in the southern North Sea, we developed a quantitative method of classifying vertical movements in order to facilitate an objective comparison of the behaviour of different individuals. This method expands the utilisation of data from data storage tags, with the potential for a better understanding of fish behaviour and enhanced individual based behaviour for improved ecosystem modelling. We found that cod were closely associated with the seabed for 90 % of the time, although they showed distinct seasonal and spatial patterns in behaviour. For example, cod tagged in the southern North Sea exhibited high rates of vertical movement in spring and autumn that were probably associated with migration, while the vertical movements of resident cod in other areas were much less extensive and were probably related to foraging or spawning behaviours. The full reasons underlying spatial and temporal behavioural plasticity by cod in the North Sea warrant further investigation.
published_date 2007-10-11T18:13:22Z
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score 11.047609

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