Tidal stream mediation of metapopulation structure in North Sea plaice
Identifieur interne : 001158 ( Main/Exploration ); précédent : 001157; suivant : 001159Tidal stream mediation of metapopulation structure in North Sea plaice
Auteurs : E. Hunter [Royaume-Uni] ; J. D. Metcalfe [Royaume-Uni] ; G. P. Arnold [Royaume-Uni] ; J. D. Reynolds [Royaume-Uni]Source :
- Journal of Fish Biology [ 0022-1112 ] ; 2003-12.
Abstract
Migration is widespread among marine fishes, yet little is known about variation in the migration of individuals within localities. We tested the hypothesis that variation in the migratory behaviour among plaice (Pleuronectes platessa) in the North Sea could be explained by large‐scale differences in the speed and directions of the tidal streams, which the fish use as a transport mechanism. Towards this end, 752 mature female plaice tagged with electronic data storage tags were released at eight locations with contrasting tidal flow properties, between December 1993 and September 1999. The experiment yielded 20 403 days of data from 145 plaice. The position of each fish was determined at intervals throughout the liberty period using the tidal location method. The results show 3 geographically discrete feeding aggregations during the summer, which dispersed over the southern North Sea and Eastern English Channel to spawn during winter. Our results re‐affirmed the major role of the tidal streams in the southern North Sea in structuring plaice dispersion, both by providing transport and guidance, and by delimiting the extent of distribution due to thermal stratification during the summer. These results confirm the prediction that large‐scale variation in migration behaviour can be explained in part by the tidal guidance and transport mechanisms available. They have revealed features of spatial dynamics not previously observed from a century of conventional tagging experiments and illustrate how the study of individual fish can successfully define the migratory characteristics of populations.
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DOI: 10.1111/j.1095-8649.2003.0216p.x
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We tested the hypothesis that variation in the migratory behaviour among plaice (Pleuronectes platessa) in the North Sea could be explained by large‐scale differences in the speed and directions of the tidal streams, which the fish use as a transport mechanism. Towards this end, 752 mature female plaice tagged with electronic data storage tags were released at eight locations with contrasting tidal flow properties, between December 1993 and September 1999. The experiment yielded 20 403 days of data from 145 plaice. The position of each fish was determined at intervals throughout the liberty period using the tidal location method. The results show 3 geographically discrete feeding aggregations during the summer, which dispersed over the southern North Sea and Eastern English Channel to spawn during winter. Our results re‐affirmed the major role of the tidal streams in the southern North Sea in structuring plaice dispersion, both by providing transport and guidance, and by delimiting the extent of distribution due to thermal stratification during the summer. These results confirm the prediction that large‐scale variation in migration behaviour can be explained in part by the tidal guidance and transport mechanisms available. They have revealed features of spatial dynamics not previously observed from a century of conventional tagging experiments and illustrate how the study of individual fish can successfully define the migratory characteristics of populations.</div></front></TEI><affiliations><list><country><li>Royaume-Uni</li></country></list><tree><country name="Royaume-Uni"><noRegion><name sortKey="Hunter, E" sort="Hunter, E" uniqKey="Hunter E" first="E." last="Hunter">E. Hunter</name></noRegion><name sortKey="Arnold, G P" sort="Arnold, G P" uniqKey="Arnold G" first="G. P." last="Arnold">G. P. Arnold</name><name sortKey="Metcalfe, J D" sort="Metcalfe, J D" uniqKey="Metcalfe J" first="J. D." last="Metcalfe">J. D. Metcalfe</name><name sortKey="Reynolds, J D" sort="Reynolds, J D" uniqKey="Reynolds J" first="J. D." last="Reynolds">J. D. Reynolds</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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