Life stage-specific, stochastic environmental effects overlay density dependence in an Atlantic salmon population
Atlantic salmon populations appear to fluctuate stochastically through time. It is suspected that both density‐dependent and density‐independent factors cause these fluctuations but the relative importance of each, and the life stages at which they operate, is not well known. In this study, a long‐t...
Published in: | Ecology of Freshwater Fish |
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ftuglasgow:oai:eprints.gla.ac.uk:176741 2023-05-15T15:30:29+02:00 Life stage-specific, stochastic environmental effects overlay density dependence in an Atlantic salmon population Honkanen, Hannele M. Boylan, Patrick Dodd, Jennifer A. Adams, Colin E. 2019-01 https://eprints.gla.ac.uk/176741/ unknown Wiley Honkanen, H. M. <http://eprints.gla.ac.uk/view/author/36564.html>, Boylan, P. <http://eprints.gla.ac.uk/view/author/30060.html>, Dodd, J. A. <http://eprints.gla.ac.uk/view/author/6545.html> and Adams, C. E. <http://eprints.gla.ac.uk/view/author/2983.html> (2019) Life stage-specific, stochastic environmental effects overlay density dependence in an Atlantic salmon population. Ecology of Freshwater Fish <https://eprints.gla.ac.uk/view/journal_volume/Ecology_of_Freshwater_Fish.html>, 28(1), pp. 156-166. (doi:10.1111/eff.12439 <https://doi.org/10.1111/eff.12439>) Articles NonPeerReviewed 2019 ftuglasgow https://doi.org/10.1111/eff.12439 2022-09-22T22:14:53Z Atlantic salmon populations appear to fluctuate stochastically through time. It is suspected that both density‐dependent and density‐independent factors cause these fluctuations but the relative importance of each, and the life stages at which they operate, is not well known. In this study, a long‐term data set on Atlantic salmon migrants returning to the Foyle catchment, Ireland, was used to determine the role of density‐dependent and life stage‐specific environmental factors regulating population size. A Ricker density‐dependent model showed that spawning adult population size significantly predicted variation in the resultant filial generation; however, a large amount of variation (ca. 68%) remained unexplained. It was shown that environmental factors were significant in explaining some of the remaining variance and that these influences were linked to specific life stages. Three life stages—spawning and incubation, fry emergence and marine survival—were shown to have significant environmental effects that resulted in changes in the returning cohort strength. It is concluded that these life stage‐specific environmental effects are likely to contribute to the stochastic variation in population size resulting from the application of traditional stock–recruitment models. The identification and quantification of these effects should allow improved model accuracy. Article in Journal/Newspaper Atlantic salmon University of Glasgow: Enlighten - Publications Ecology of Freshwater Fish 28 1 156 166 |
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University of Glasgow: Enlighten - Publications |
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ftuglasgow |
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description |
Atlantic salmon populations appear to fluctuate stochastically through time. It is suspected that both density‐dependent and density‐independent factors cause these fluctuations but the relative importance of each, and the life stages at which they operate, is not well known. In this study, a long‐term data set on Atlantic salmon migrants returning to the Foyle catchment, Ireland, was used to determine the role of density‐dependent and life stage‐specific environmental factors regulating population size. A Ricker density‐dependent model showed that spawning adult population size significantly predicted variation in the resultant filial generation; however, a large amount of variation (ca. 68%) remained unexplained. It was shown that environmental factors were significant in explaining some of the remaining variance and that these influences were linked to specific life stages. Three life stages—spawning and incubation, fry emergence and marine survival—were shown to have significant environmental effects that resulted in changes in the returning cohort strength. It is concluded that these life stage‐specific environmental effects are likely to contribute to the stochastic variation in population size resulting from the application of traditional stock–recruitment models. The identification and quantification of these effects should allow improved model accuracy. |
format |
Article in Journal/Newspaper |
author |
Honkanen, Hannele M. Boylan, Patrick Dodd, Jennifer A. Adams, Colin E. |
spellingShingle |
Honkanen, Hannele M. Boylan, Patrick Dodd, Jennifer A. Adams, Colin E. Life stage-specific, stochastic environmental effects overlay density dependence in an Atlantic salmon population |
author_facet |
Honkanen, Hannele M. Boylan, Patrick Dodd, Jennifer A. Adams, Colin E. |
author_sort |
Honkanen, Hannele M. |
title |
Life stage-specific, stochastic environmental effects overlay density dependence in an Atlantic salmon population |
title_short |
Life stage-specific, stochastic environmental effects overlay density dependence in an Atlantic salmon population |
title_full |
Life stage-specific, stochastic environmental effects overlay density dependence in an Atlantic salmon population |
title_fullStr |
Life stage-specific, stochastic environmental effects overlay density dependence in an Atlantic salmon population |
title_full_unstemmed |
Life stage-specific, stochastic environmental effects overlay density dependence in an Atlantic salmon population |
title_sort |
life stage-specific, stochastic environmental effects overlay density dependence in an atlantic salmon population |
publisher |
Wiley |
publishDate |
2019 |
url |
https://eprints.gla.ac.uk/176741/ |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_relation |
Honkanen, H. M. <http://eprints.gla.ac.uk/view/author/36564.html>, Boylan, P. <http://eprints.gla.ac.uk/view/author/30060.html>, Dodd, J. A. <http://eprints.gla.ac.uk/view/author/6545.html> and Adams, C. E. <http://eprints.gla.ac.uk/view/author/2983.html> (2019) Life stage-specific, stochastic environmental effects overlay density dependence in an Atlantic salmon population. Ecology of Freshwater Fish <https://eprints.gla.ac.uk/view/journal_volume/Ecology_of_Freshwater_Fish.html>, 28(1), pp. 156-166. (doi:10.1111/eff.12439 <https://doi.org/10.1111/eff.12439>) |
op_doi |
https://doi.org/10.1111/eff.12439 |
container_title |
Ecology of Freshwater Fish |
container_volume |
28 |
container_issue |
1 |
container_start_page |
156 |
op_container_end_page |
166 |
_version_ |
1766360924252274688 |