The source of autumn and spring downstream migrating juvenile Atlantic salmon in a small lowland river
Abstract Over 3 years, 32,444 age‐0 group A tlantic salmon ( S almo salar ) parr tagged with passive integrated transponder tags throughout the R iver F rome catchment were assigned to one of three groups, nonmigrants, autumn migrants and spring smolts, depending on the detection and the timing of d...
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crwiley:10.1111/eff.12003 2024-09-15T17:56:30+00:00 The source of autumn and spring downstream migrating juvenile Atlantic salmon in a small lowland river Ibbotson, Anton T. Riley, William D. Beaumont, William R.C. Cook, Alastair C. Ives, Mark J. Pinder, Adrian C. Scott, Luke J. 2012 http://dx.doi.org/10.1111/eff.12003 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Feff.12003 https://onlinelibrary.wiley.com/doi/pdf/10.1111/eff.12003 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Ecology of Freshwater Fish volume 22, issue 1, page 73-81 ISSN 0906-6691 1600-0633 journal-article 2012 crwiley https://doi.org/10.1111/eff.12003 2024-08-22T04:17:15Z Abstract Over 3 years, 32,444 age‐0 group A tlantic salmon ( S almo salar ) parr tagged with passive integrated transponder tags throughout the R iver F rome catchment were assigned to one of three groups, nonmigrants, autumn migrants and spring smolts, depending on the detection and the timing of detection at downstream tag readers (situated 8.6 km above the tidal limit). We examined the effect of density at the time of tagging (n·m −2 ), distance upstream from the tidal limit (km), fish length (mm), Fulton condition index, habitat type (divided into two types, main river and carrier), days after 1 September that each fish was tagged and year (replication) on the proportions of fish in each of the migration groups. Distance upstream from tidal limit was strongly negatively related to the proportion of autumn migrants and positively related to the proportion of spring smolts. Nonmigrants had a lower average body size than migrants, although there were no differences in the sizes of autumn migrants and spring smolts in September prior to migration. Fish density had no effect on migration strategy. A lower proportion of fish migrated as autumn migrants from the smaller carrier habitats than the main river channel. There is some evidence that those parr destined to become autumn migrants underwent a lower mortality rate during September before tagging than those destined to become spring migrants indicating possible physiological or behavioural differences between these two groups of fish at that time. More research into the factors responsible for initiating the autumn migration is required. Article in Journal/Newspaper Atlantic salmon Wiley Online Library Ecology of Freshwater Fish 22 1 73 81 |
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Wiley Online Library |
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English |
description |
Abstract Over 3 years, 32,444 age‐0 group A tlantic salmon ( S almo salar ) parr tagged with passive integrated transponder tags throughout the R iver F rome catchment were assigned to one of three groups, nonmigrants, autumn migrants and spring smolts, depending on the detection and the timing of detection at downstream tag readers (situated 8.6 km above the tidal limit). We examined the effect of density at the time of tagging (n·m −2 ), distance upstream from the tidal limit (km), fish length (mm), Fulton condition index, habitat type (divided into two types, main river and carrier), days after 1 September that each fish was tagged and year (replication) on the proportions of fish in each of the migration groups. Distance upstream from tidal limit was strongly negatively related to the proportion of autumn migrants and positively related to the proportion of spring smolts. Nonmigrants had a lower average body size than migrants, although there were no differences in the sizes of autumn migrants and spring smolts in September prior to migration. Fish density had no effect on migration strategy. A lower proportion of fish migrated as autumn migrants from the smaller carrier habitats than the main river channel. There is some evidence that those parr destined to become autumn migrants underwent a lower mortality rate during September before tagging than those destined to become spring migrants indicating possible physiological or behavioural differences between these two groups of fish at that time. More research into the factors responsible for initiating the autumn migration is required. |
format |
Article in Journal/Newspaper |
author |
Ibbotson, Anton T. Riley, William D. Beaumont, William R.C. Cook, Alastair C. Ives, Mark J. Pinder, Adrian C. Scott, Luke J. |
spellingShingle |
Ibbotson, Anton T. Riley, William D. Beaumont, William R.C. Cook, Alastair C. Ives, Mark J. Pinder, Adrian C. Scott, Luke J. The source of autumn and spring downstream migrating juvenile Atlantic salmon in a small lowland river |
author_facet |
Ibbotson, Anton T. Riley, William D. Beaumont, William R.C. Cook, Alastair C. Ives, Mark J. Pinder, Adrian C. Scott, Luke J. |
author_sort |
Ibbotson, Anton T. |
title |
The source of autumn and spring downstream migrating juvenile Atlantic salmon in a small lowland river |
title_short |
The source of autumn and spring downstream migrating juvenile Atlantic salmon in a small lowland river |
title_full |
The source of autumn and spring downstream migrating juvenile Atlantic salmon in a small lowland river |
title_fullStr |
The source of autumn and spring downstream migrating juvenile Atlantic salmon in a small lowland river |
title_full_unstemmed |
The source of autumn and spring downstream migrating juvenile Atlantic salmon in a small lowland river |
title_sort |
source of autumn and spring downstream migrating juvenile atlantic salmon in a small lowland river |
publisher |
Wiley |
publishDate |
2012 |
url |
http://dx.doi.org/10.1111/eff.12003 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Feff.12003 https://onlinelibrary.wiley.com/doi/pdf/10.1111/eff.12003 |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
Ecology of Freshwater Fish volume 22, issue 1, page 73-81 ISSN 0906-6691 1600-0633 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/eff.12003 |
container_title |
Ecology of Freshwater Fish |
container_volume |
22 |
container_issue |
1 |
container_start_page |
73 |
op_container_end_page |
81 |
_version_ |
1810432709197037568 |