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Vertical movements of North Sea Cod

Hobson, Victoria J., Righton, David, Metcalfe, Julian D. and Hays, Graeme C. 2007, Vertical movements of North Sea Cod, Marine ecology progress series, vol. 347, pp. 101-110, doi: 10.3354/meps07047.

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Title Vertical movements of North Sea Cod
Author(s) Hobson, Victoria J.
Righton, David
Metcalfe, Julian D.
Hays, Graeme C.ORCID iD for Hays, Graeme C. orcid.org/0000-0002-3314-8189
Journal name Marine ecology progress series
Volume number 347
Start page 101
End page 110
Total pages 10
Publisher Inter-Research
Place of publication Oldendorf, Germany
Publication date 2007
ISSN 0171-8630
1616-1599
Keyword(s) time-depth recorder
vertical movement
satellite tracking
tuna
shark
turtle
Summary 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.
Language eng
DOI 10.3354/meps07047
Field of Research 069999 Biological Sciences not elsewhere classified
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2007, Inter-Research
Free to Read? Yes
Persistent URL http://hdl.handle.net/10536/DRO/DU:30058358

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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.