Predicting population responses to restoration of breeding habitat in Atlantic salmon
Summary Habitat degradation is seriously threatening stream biodiversity and productivity world‐wide. For salmonid fish, restoration projects in disturbed systems commonly aim at increasing the availability of suitable breeding habitats, but expectations of effects on population abundance based on e...
Published in: | Journal of Applied Ecology |
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Online Access: | http://dx.doi.org/10.1111/j.1365-2664.2008.01464.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2664.2008.01464.x https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2664.2008.01464.x |
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crwiley:10.1111/j.1365-2664.2008.01464.x 2024-06-02T08:03:42+00:00 Predicting population responses to restoration of breeding habitat in Atlantic salmon Einum, Sigurd Nislow, Keith H. Reynolds, John D. Sutherland, William J. 2008 http://dx.doi.org/10.1111/j.1365-2664.2008.01464.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2664.2008.01464.x https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2664.2008.01464.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Applied Ecology volume 45, issue 3, page 930-938 ISSN 0021-8901 1365-2664 journal-article 2008 crwiley https://doi.org/10.1111/j.1365-2664.2008.01464.x 2024-05-03T10:56:03Z Summary Habitat degradation is seriously threatening stream biodiversity and productivity world‐wide. For salmonid fish, restoration projects in disturbed systems commonly aim at increasing the availability of suitable breeding habitats, but expectations of effects on population abundance based on explicit models are lacking. We used a spatial population model to predict how breeder dispersion may influence population dynamics of salmonids. Simulations involved changing the relative abundance of habitat suitable for two juvenile size classes (small fry and larger parr), the type of density‐dependent regulation (effects on survival only vs. effects on survival and growth) and intercohort competitive mechanisms. Increased breeding dispersion could alter patterns of density‐dependent mortality and increase equilibrium adult abundance and maximum sustainable yield (MSY). However, there was a strong interaction between stage‐specific habitat abundance and breeding dispersion. The most pronounced effects of breeding dispersion were observed under intermediate levels of fry habitat abundance. When fry habitat was abundant, density‐dependent mortality was most intense during the parr stage, and increased breeding dispersion did not increase adult abundance or MSY. In fact, when populations were regulated in the parr stage, increased breeding dispersion could cause decreased adult abundance because of the effects of intercohort competition. This negative effect only occurred, however, when competition among juveniles was symmetric (no age or size advantage). Synthesis and applications. The population effects of restoring breeding habitat can differ among environments, and we have demonstrated how these differences can be understood in the light of stage‐specific density dependence. Increasing spatial dispersion of breeders may often be an efficient measure for conserving threatened populations and increasing yields in fished populations. However, if direct evidence or habitat considerations suggest that fish populations ... Article in Journal/Newspaper Atlantic salmon Wiley Online Library Journal of Applied Ecology 45 3 930 938 |
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Wiley Online Library |
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language |
English |
description |
Summary Habitat degradation is seriously threatening stream biodiversity and productivity world‐wide. For salmonid fish, restoration projects in disturbed systems commonly aim at increasing the availability of suitable breeding habitats, but expectations of effects on population abundance based on explicit models are lacking. We used a spatial population model to predict how breeder dispersion may influence population dynamics of salmonids. Simulations involved changing the relative abundance of habitat suitable for two juvenile size classes (small fry and larger parr), the type of density‐dependent regulation (effects on survival only vs. effects on survival and growth) and intercohort competitive mechanisms. Increased breeding dispersion could alter patterns of density‐dependent mortality and increase equilibrium adult abundance and maximum sustainable yield (MSY). However, there was a strong interaction between stage‐specific habitat abundance and breeding dispersion. The most pronounced effects of breeding dispersion were observed under intermediate levels of fry habitat abundance. When fry habitat was abundant, density‐dependent mortality was most intense during the parr stage, and increased breeding dispersion did not increase adult abundance or MSY. In fact, when populations were regulated in the parr stage, increased breeding dispersion could cause decreased adult abundance because of the effects of intercohort competition. This negative effect only occurred, however, when competition among juveniles was symmetric (no age or size advantage). Synthesis and applications. The population effects of restoring breeding habitat can differ among environments, and we have demonstrated how these differences can be understood in the light of stage‐specific density dependence. Increasing spatial dispersion of breeders may often be an efficient measure for conserving threatened populations and increasing yields in fished populations. However, if direct evidence or habitat considerations suggest that fish populations ... |
format |
Article in Journal/Newspaper |
author |
Einum, Sigurd Nislow, Keith H. Reynolds, John D. Sutherland, William J. |
spellingShingle |
Einum, Sigurd Nislow, Keith H. Reynolds, John D. Sutherland, William J. Predicting population responses to restoration of breeding habitat in Atlantic salmon |
author_facet |
Einum, Sigurd Nislow, Keith H. Reynolds, John D. Sutherland, William J. |
author_sort |
Einum, Sigurd |
title |
Predicting population responses to restoration of breeding habitat in Atlantic salmon |
title_short |
Predicting population responses to restoration of breeding habitat in Atlantic salmon |
title_full |
Predicting population responses to restoration of breeding habitat in Atlantic salmon |
title_fullStr |
Predicting population responses to restoration of breeding habitat in Atlantic salmon |
title_full_unstemmed |
Predicting population responses to restoration of breeding habitat in Atlantic salmon |
title_sort |
predicting population responses to restoration of breeding habitat in atlantic salmon |
publisher |
Wiley |
publishDate |
2008 |
url |
http://dx.doi.org/10.1111/j.1365-2664.2008.01464.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2664.2008.01464.x https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2664.2008.01464.x |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
Journal of Applied Ecology volume 45, issue 3, page 930-938 ISSN 0021-8901 1365-2664 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1365-2664.2008.01464.x |
container_title |
Journal of Applied Ecology |
container_volume |
45 |
container_issue |
3 |
container_start_page |
930 |
op_container_end_page |
938 |
_version_ |
1800748312213585920 |