Effect of aquatic mosses on juvenile fish density and habitat use in the regulated River Suldalslågen, western Norway
Abstract Two morphologically distinct moss communities were found in the River Suldalslågen. The liver moss community consists of species which form a dense mat on the bottom, while the river moss ( Fontinalis ) community forms long tufts. Moss growth has increased since hydropower regulations due t...
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crwiley:10.1002/rra.668 2024-06-02T08:03:37+00:00 Effect of aquatic mosses on juvenile fish density and habitat use in the regulated River Suldalslågen, western Norway Heggenes, Jan Saltveit, Svein Jakob 2002 http://dx.doi.org/10.1002/rra.668 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Frra.668 https://onlinelibrary.wiley.com/doi/pdf/10.1002/rra.668 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor River Research and Applications volume 18, issue 3, page 249-264 ISSN 1535-1459 1535-1467 journal-article 2002 crwiley https://doi.org/10.1002/rra.668 2024-05-03T11:27:36Z Abstract Two morphologically distinct moss communities were found in the River Suldalslågen. The liver moss community consists of species which form a dense mat on the bottom, while the river moss ( Fontinalis ) community forms long tufts. Moss growth has increased since hydropower regulations due to reduced floods and increased winter flows. Increased moss cover affects the bottom structure, as well as intra‐gravel and near‐bottom hydraulics. We studied densities of juvenile Atlantic salmon ( Salmo salar) and brown trout ( Salmo trutta ) by electrofishing and habitat selection by direct underwater observation, in areas with natural moss cover compared with areas where mosses were experimentally removed. Areas with dense mats of liver mosses held lower densities of young of year (YoY) and older salmon parr than areas where liver moss had been removed. No differences in densities of YoY salmon were found between areas with and without Fontinalis . For older salmon, parr results were inconclusive. In some samples more and in others fewer fish were found in areas with Fontinalis moss removed. For trout, densities were higher in areas with Fontinalis , while results for liver moss were inconclusive. No major differences were found with regard to microhabitat selection between areas with and without river moss, suggesting that habitat quality in these areas was similar during summer, except with respect to substrate. Salmon held more exposed positions in areas without liver moss, but this is mainly attributed to different habitat availabilities. It is concluded that the relative increase in liver mosses in the River Suldalslågen has a negative impact on juvenile Atlantic salmon fish density. Copyright © 2002 John Wiley & Sons, Ltd. Article in Journal/Newspaper Atlantic salmon Salmo salar Wiley Online Library Norway River Research and Applications 18 3 249 264 |
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Wiley Online Library |
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English |
description |
Abstract Two morphologically distinct moss communities were found in the River Suldalslågen. The liver moss community consists of species which form a dense mat on the bottom, while the river moss ( Fontinalis ) community forms long tufts. Moss growth has increased since hydropower regulations due to reduced floods and increased winter flows. Increased moss cover affects the bottom structure, as well as intra‐gravel and near‐bottom hydraulics. We studied densities of juvenile Atlantic salmon ( Salmo salar) and brown trout ( Salmo trutta ) by electrofishing and habitat selection by direct underwater observation, in areas with natural moss cover compared with areas where mosses were experimentally removed. Areas with dense mats of liver mosses held lower densities of young of year (YoY) and older salmon parr than areas where liver moss had been removed. No differences in densities of YoY salmon were found between areas with and without Fontinalis . For older salmon, parr results were inconclusive. In some samples more and in others fewer fish were found in areas with Fontinalis moss removed. For trout, densities were higher in areas with Fontinalis , while results for liver moss were inconclusive. No major differences were found with regard to microhabitat selection between areas with and without river moss, suggesting that habitat quality in these areas was similar during summer, except with respect to substrate. Salmon held more exposed positions in areas without liver moss, but this is mainly attributed to different habitat availabilities. It is concluded that the relative increase in liver mosses in the River Suldalslågen has a negative impact on juvenile Atlantic salmon fish density. Copyright © 2002 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Heggenes, Jan Saltveit, Svein Jakob |
spellingShingle |
Heggenes, Jan Saltveit, Svein Jakob Effect of aquatic mosses on juvenile fish density and habitat use in the regulated River Suldalslågen, western Norway |
author_facet |
Heggenes, Jan Saltveit, Svein Jakob |
author_sort |
Heggenes, Jan |
title |
Effect of aquatic mosses on juvenile fish density and habitat use in the regulated River Suldalslågen, western Norway |
title_short |
Effect of aquatic mosses on juvenile fish density and habitat use in the regulated River Suldalslågen, western Norway |
title_full |
Effect of aquatic mosses on juvenile fish density and habitat use in the regulated River Suldalslågen, western Norway |
title_fullStr |
Effect of aquatic mosses on juvenile fish density and habitat use in the regulated River Suldalslågen, western Norway |
title_full_unstemmed |
Effect of aquatic mosses on juvenile fish density and habitat use in the regulated River Suldalslågen, western Norway |
title_sort |
effect of aquatic mosses on juvenile fish density and habitat use in the regulated river suldalslågen, western norway |
publisher |
Wiley |
publishDate |
2002 |
url |
http://dx.doi.org/10.1002/rra.668 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Frra.668 https://onlinelibrary.wiley.com/doi/pdf/10.1002/rra.668 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
River Research and Applications volume 18, issue 3, page 249-264 ISSN 1535-1459 1535-1467 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/rra.668 |
container_title |
River Research and Applications |
container_volume |
18 |
container_issue |
3 |
container_start_page |
249 |
op_container_end_page |
264 |
_version_ |
1800748185865420800 |