hays-verticalmovements-2007.pdf (886.89 kB)
Vertical movements of North Sea Cod
journal contribution
posted on 2007-01-01, 00:00 authored by V Hobson, D Righton, J Metcalfe, Graeme HaysGraeme HaysVarious 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.
History
Journal
Marine ecology progress seriesVolume
347Pagination
101 - 110Publisher
Inter-ResearchLocation
Oldendorf, GermanyPublisher DOI
ISSN
0171-8630eISSN
1616-1599Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2007, Inter-ResearchUsage metrics
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Keywords
time-depth recordervertical movementsatellite trackingtunasharkturtleScience & TechnologyLife Sciences & BiomedicinePhysical SciencesEcologyMarine & Freshwater BiologyOceanographyEnvironmental Sciences & EcologyDATA-STORAGE TAGSGADUS-MORHUA LULTRASONIC TELEMETRYMIGRATION PATTERNSWHALE SHARKSBEHAVIORATLANTICFISHTEMPERATUREPLAICEZoologyOceanographyEcology
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