Mechanisms underlying the increase in young-of-the-year Atlantic salmon (Salmo salar) density with habitat complexity
We tested three hypotheses used to explain the increase in young-of-the-year (YOY) Atlantic salmon ( Salmo salar ) density with habitat complexity: the territory-size, predator-refuge, and foraging-benefits hypotheses. We manipulated habitat complexity in three different treatments (boulder-removed,...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Online Access: | http://dx.doi.org/10.1139/f08-106 http://www.nrcresearchpress.com/doi/full-xml/10.1139/F08-106 http://www.nrcresearchpress.com/doi/pdf/10.1139/F08-106 |
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crcansciencepubl:10.1139/f08-106 2024-09-15T17:55:59+00:00 Mechanisms underlying the increase in young-of-the-year Atlantic salmon (Salmo salar) density with habitat complexity Venter, Oscar Grant, James W.A. Noël, Michelle V. Kim, Jae-woo 2008 http://dx.doi.org/10.1139/f08-106 http://www.nrcresearchpress.com/doi/full-xml/10.1139/F08-106 http://www.nrcresearchpress.com/doi/pdf/10.1139/F08-106 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 65, issue 9, page 1956-1964 ISSN 0706-652X 1205-7533 journal-article 2008 crcansciencepubl https://doi.org/10.1139/f08-106 2024-07-18T04:13:38Z We tested three hypotheses used to explain the increase in young-of-the-year (YOY) Atlantic salmon ( Salmo salar ) density with habitat complexity: the territory-size, predator-refuge, and foraging-benefits hypotheses. We manipulated habitat complexity in three different treatments (boulder-removed, control, and boulder-added) at eight sites in Catamaran Brook and the Little Southwest Miramichi River, New Brunswick. The density of juvenile salmon was two times higher in the boulder-added treatment than in the other treatments. Our data were consistent with the territory-size hypothesis; visual isolation was highest and territory size was smallest in the boulder-added treatment, and salmon selected microhabitats to maximize their field of view. Our results showed partial support for the predator-refuge hypothesis; salmon in the boulder-added sites were closer to cover and showed a reduced reaction distance to a novel stimulus, but did not preferentially select microhabitats closer to cover. We found no direct support for the foraging-benefits hypothesis; however, there is indirect evidence that boulders may improve the growth potential of instream habitat. Our results suggest that YOY Atlantic salmon may be attracted to complex environments for the increased cover and that the decreased visibility of these sites causes a reduction in territory size, allowing a higher density of fish. Article in Journal/Newspaper Atlantic salmon Salmo salar Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 65 9 1956 1964 |
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Open Polar |
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Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
We tested three hypotheses used to explain the increase in young-of-the-year (YOY) Atlantic salmon ( Salmo salar ) density with habitat complexity: the territory-size, predator-refuge, and foraging-benefits hypotheses. We manipulated habitat complexity in three different treatments (boulder-removed, control, and boulder-added) at eight sites in Catamaran Brook and the Little Southwest Miramichi River, New Brunswick. The density of juvenile salmon was two times higher in the boulder-added treatment than in the other treatments. Our data were consistent with the territory-size hypothesis; visual isolation was highest and territory size was smallest in the boulder-added treatment, and salmon selected microhabitats to maximize their field of view. Our results showed partial support for the predator-refuge hypothesis; salmon in the boulder-added sites were closer to cover and showed a reduced reaction distance to a novel stimulus, but did not preferentially select microhabitats closer to cover. We found no direct support for the foraging-benefits hypothesis; however, there is indirect evidence that boulders may improve the growth potential of instream habitat. Our results suggest that YOY Atlantic salmon may be attracted to complex environments for the increased cover and that the decreased visibility of these sites causes a reduction in territory size, allowing a higher density of fish. |
format |
Article in Journal/Newspaper |
author |
Venter, Oscar Grant, James W.A. Noël, Michelle V. Kim, Jae-woo |
spellingShingle |
Venter, Oscar Grant, James W.A. Noël, Michelle V. Kim, Jae-woo Mechanisms underlying the increase in young-of-the-year Atlantic salmon (Salmo salar) density with habitat complexity |
author_facet |
Venter, Oscar Grant, James W.A. Noël, Michelle V. Kim, Jae-woo |
author_sort |
Venter, Oscar |
title |
Mechanisms underlying the increase in young-of-the-year Atlantic salmon (Salmo salar) density with habitat complexity |
title_short |
Mechanisms underlying the increase in young-of-the-year Atlantic salmon (Salmo salar) density with habitat complexity |
title_full |
Mechanisms underlying the increase in young-of-the-year Atlantic salmon (Salmo salar) density with habitat complexity |
title_fullStr |
Mechanisms underlying the increase in young-of-the-year Atlantic salmon (Salmo salar) density with habitat complexity |
title_full_unstemmed |
Mechanisms underlying the increase in young-of-the-year Atlantic salmon (Salmo salar) density with habitat complexity |
title_sort |
mechanisms underlying the increase in young-of-the-year atlantic salmon (salmo salar) density with habitat complexity |
publisher |
Canadian Science Publishing |
publishDate |
2008 |
url |
http://dx.doi.org/10.1139/f08-106 http://www.nrcresearchpress.com/doi/full-xml/10.1139/F08-106 http://www.nrcresearchpress.com/doi/pdf/10.1139/F08-106 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 65, issue 9, page 1956-1964 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f08-106 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
65 |
container_issue |
9 |
container_start_page |
1956 |
op_container_end_page |
1964 |
_version_ |
1810432203132239872 |