Entry of adult Atlantic salmon into a tributary of the Aberdeenshire Dee, Scotland
Abstract Upstream counts of adult salmon in a tributary to the River Dee during autumn and winter were examined over a 13‐year period using an optical fish counter. Statistical analysis indicated that salmon were mainly primed to enter the tributary at a particular time of year, peaking at early Dec...
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crwiley:10.1111/eff.12346 2024-06-02T08:03:42+00:00 Entry of adult Atlantic salmon into a tributary of the Aberdeenshire Dee, Scotland Sparholt, Henrik Hawkins, Anthony Thomson, Alistair 2017 http://dx.doi.org/10.1111/eff.12346 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Feff.12346 https://onlinelibrary.wiley.com/doi/pdf/10.1111/eff.12346 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Ecology of Freshwater Fish volume 27, issue 1, page 280-295 ISSN 0906-6691 1600-0633 journal-article 2017 crwiley https://doi.org/10.1111/eff.12346 2024-05-03T11:18:31Z Abstract Upstream counts of adult salmon in a tributary to the River Dee during autumn and winter were examined over a 13‐year period using an optical fish counter. Statistical analysis indicated that salmon were mainly primed to enter the tributary at a particular time of year, peaking at early December. However, environmental factors also had a large influence. Entry of salmon was initiated by high flow rates in the main stem of the River Dee. Increases in water level in the tributary itself were not needed to stimulate the entry of salmon. Moreover, a change in flow from 1 day to the next did not result in a response from salmon. Rather, they reacted only after more than a day of flow increase. There was no consistent threshold level of flow that triggered tributary entry. The upstream passage of salmon was reduced at low temperatures (below 3°C). The numbers of salmon migrating upstream showed a gradual increase as the temperatures increased up to 11°C, and then sharply decreased at higher temperatures. Female salmon migrated earlier by about 2 weeks on average than males. Increasingly, counters and traps are being installed on spawning tributaries to examine the state of salmon stocks. Caution should be exercised, however, in using upstream entry data from individual tributaries to provide an overall assessment of salmon abundance, as local conditions in the tributaries may affect the salmon counts in particular years. Article in Journal/Newspaper Atlantic salmon Wiley Online Library Dee ENVELOPE(-59.767,-59.767,-62.433,-62.433) Ecology of Freshwater Fish 27 1 280 295 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Upstream counts of adult salmon in a tributary to the River Dee during autumn and winter were examined over a 13‐year period using an optical fish counter. Statistical analysis indicated that salmon were mainly primed to enter the tributary at a particular time of year, peaking at early December. However, environmental factors also had a large influence. Entry of salmon was initiated by high flow rates in the main stem of the River Dee. Increases in water level in the tributary itself were not needed to stimulate the entry of salmon. Moreover, a change in flow from 1 day to the next did not result in a response from salmon. Rather, they reacted only after more than a day of flow increase. There was no consistent threshold level of flow that triggered tributary entry. The upstream passage of salmon was reduced at low temperatures (below 3°C). The numbers of salmon migrating upstream showed a gradual increase as the temperatures increased up to 11°C, and then sharply decreased at higher temperatures. Female salmon migrated earlier by about 2 weeks on average than males. Increasingly, counters and traps are being installed on spawning tributaries to examine the state of salmon stocks. Caution should be exercised, however, in using upstream entry data from individual tributaries to provide an overall assessment of salmon abundance, as local conditions in the tributaries may affect the salmon counts in particular years. |
format |
Article in Journal/Newspaper |
author |
Sparholt, Henrik Hawkins, Anthony Thomson, Alistair |
spellingShingle |
Sparholt, Henrik Hawkins, Anthony Thomson, Alistair Entry of adult Atlantic salmon into a tributary of the Aberdeenshire Dee, Scotland |
author_facet |
Sparholt, Henrik Hawkins, Anthony Thomson, Alistair |
author_sort |
Sparholt, Henrik |
title |
Entry of adult Atlantic salmon into a tributary of the Aberdeenshire Dee, Scotland |
title_short |
Entry of adult Atlantic salmon into a tributary of the Aberdeenshire Dee, Scotland |
title_full |
Entry of adult Atlantic salmon into a tributary of the Aberdeenshire Dee, Scotland |
title_fullStr |
Entry of adult Atlantic salmon into a tributary of the Aberdeenshire Dee, Scotland |
title_full_unstemmed |
Entry of adult Atlantic salmon into a tributary of the Aberdeenshire Dee, Scotland |
title_sort |
entry of adult atlantic salmon into a tributary of the aberdeenshire dee, scotland |
publisher |
Wiley |
publishDate |
2017 |
url |
http://dx.doi.org/10.1111/eff.12346 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Feff.12346 https://onlinelibrary.wiley.com/doi/pdf/10.1111/eff.12346 |
long_lat |
ENVELOPE(-59.767,-59.767,-62.433,-62.433) |
geographic |
Dee |
geographic_facet |
Dee |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
Ecology of Freshwater Fish volume 27, issue 1, page 280-295 ISSN 0906-6691 1600-0633 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/eff.12346 |
container_title |
Ecology of Freshwater Fish |
container_volume |
27 |
container_issue |
1 |
container_start_page |
280 |
op_container_end_page |
295 |
_version_ |
1800748296108507136 |