Diel migration patterns of Atlantic salmon smolts with particular reference to the absence of crepuscular migration
Abstract – The real-time diel pattern of Atlantic salmon smolt migration was observed for 8 years using automatic resistivity counters verified by video surveillance. A clear dominant nocturnal migration was demonstrated early in the migration period, later becoming increasingly diurnal, until rates...
Published in: | Ecology of Freshwater Fish |
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2006
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Online Access: | http://nora.nerc.ac.uk/id/eprint/2874/ http://onlinelibrary.wiley.com/doi/abs/10.1111/j.1600-0633.2006.00194.x https://doi.org/10.1111/j.1600-0633.2006.00194.x |
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ftnerc:oai:nora.nerc.ac.uk:2874 2024-06-09T07:44:46+00:00 Diel migration patterns of Atlantic salmon smolts with particular reference to the absence of crepuscular migration Ibbotson, A. T. Beaumont, W. R. C. Pinder, A. Welton, S. Ladle, M. 2006 http://nora.nerc.ac.uk/id/eprint/2874/ http://onlinelibrary.wiley.com/doi/abs/10.1111/j.1600-0633.2006.00194.x https://doi.org/10.1111/j.1600-0633.2006.00194.x unknown Ibbotson, A. T.; Beaumont, W. R. C.; Pinder, A.; Welton, S.; Ladle, M. 2006 Diel migration patterns of Atlantic salmon smolts with particular reference to the absence of crepuscular migration. Ecology of Freshwater Fish, 15. 544-551. https://doi.org/10.1111/j.1600-0633.2006.00194.x <https://doi.org/10.1111/j.1600-0633.2006.00194.x> Ecology and Environment Publication - Article PeerReviewed 2006 ftnerc https://doi.org/10.1111/j.1600-0633.2006.00194.x 2024-05-15T08:44:37Z Abstract – The real-time diel pattern of Atlantic salmon smolt migration was observed for 8 years using automatic resistivity counters verified by video surveillance. A clear dominant nocturnal migration was demonstrated early in the migration period, later becoming increasingly diurnal, until rates became approximately equal at day and night. Migration patterns were related to water temperature, such that when mean daily temperatures were below 12 °C, hourly rates of migration were significantly lower during the day than at night. When daily mean temperatures exceeded 12 °C, there was no significant difference between diurnal and nocturnal migration rates. Migration patterns showed a distinct suppression of migration at dawn and dusk throughout the migration period. It is hypothesised that this behaviour is an active decision and/or an adaptive strategy either to take advantage of increased food in the form of invertebrate drift or to reduce predation risk from actively feeding piscivores or both. Article in Journal/Newspaper Atlantic salmon Natural Environment Research Council: NERC Open Research Archive Ecology of Freshwater Fish 15 4 544 551 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Ecology and Environment |
spellingShingle |
Ecology and Environment Ibbotson, A. T. Beaumont, W. R. C. Pinder, A. Welton, S. Ladle, M. Diel migration patterns of Atlantic salmon smolts with particular reference to the absence of crepuscular migration |
topic_facet |
Ecology and Environment |
description |
Abstract – The real-time diel pattern of Atlantic salmon smolt migration was observed for 8 years using automatic resistivity counters verified by video surveillance. A clear dominant nocturnal migration was demonstrated early in the migration period, later becoming increasingly diurnal, until rates became approximately equal at day and night. Migration patterns were related to water temperature, such that when mean daily temperatures were below 12 °C, hourly rates of migration were significantly lower during the day than at night. When daily mean temperatures exceeded 12 °C, there was no significant difference between diurnal and nocturnal migration rates. Migration patterns showed a distinct suppression of migration at dawn and dusk throughout the migration period. It is hypothesised that this behaviour is an active decision and/or an adaptive strategy either to take advantage of increased food in the form of invertebrate drift or to reduce predation risk from actively feeding piscivores or both. |
format |
Article in Journal/Newspaper |
author |
Ibbotson, A. T. Beaumont, W. R. C. Pinder, A. Welton, S. Ladle, M. |
author_facet |
Ibbotson, A. T. Beaumont, W. R. C. Pinder, A. Welton, S. Ladle, M. |
author_sort |
Ibbotson, A. T. |
title |
Diel migration patterns of Atlantic salmon smolts with particular reference to the absence of crepuscular migration |
title_short |
Diel migration patterns of Atlantic salmon smolts with particular reference to the absence of crepuscular migration |
title_full |
Diel migration patterns of Atlantic salmon smolts with particular reference to the absence of crepuscular migration |
title_fullStr |
Diel migration patterns of Atlantic salmon smolts with particular reference to the absence of crepuscular migration |
title_full_unstemmed |
Diel migration patterns of Atlantic salmon smolts with particular reference to the absence of crepuscular migration |
title_sort |
diel migration patterns of atlantic salmon smolts with particular reference to the absence of crepuscular migration |
publishDate |
2006 |
url |
http://nora.nerc.ac.uk/id/eprint/2874/ http://onlinelibrary.wiley.com/doi/abs/10.1111/j.1600-0633.2006.00194.x https://doi.org/10.1111/j.1600-0633.2006.00194.x |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_relation |
Ibbotson, A. T.; Beaumont, W. R. C.; Pinder, A.; Welton, S.; Ladle, M. 2006 Diel migration patterns of Atlantic salmon smolts with particular reference to the absence of crepuscular migration. Ecology of Freshwater Fish, 15. 544-551. https://doi.org/10.1111/j.1600-0633.2006.00194.x <https://doi.org/10.1111/j.1600-0633.2006.00194.x> |
op_doi |
https://doi.org/10.1111/j.1600-0633.2006.00194.x |
container_title |
Ecology of Freshwater Fish |
container_volume |
15 |
container_issue |
4 |
container_start_page |
544 |
op_container_end_page |
551 |
_version_ |
1801373570937389056 |