Adverse impact of forestry on fish and fisheries in stream environments of the Isojoki basin, western Finland
The effects of forestry on fish and fisheries were studied in the Isojoki basin, western Finland. The most abundant fish species in the study area, brown trout (Salmo trutta L.), was found in 27 of 50 brooks studied. Enzyme electrophoresis revealed at least five genetically differentiated stocks of...
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Boreal Environment Research Publishing Board
2024
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/578037 2024-09-15T18:00:10+00:00 Adverse impact of forestry on fish and fisheries in stream environments of the Isojoki basin, western Finland Jutila, E. Ahvonen, A. Laamanen, M. Koskiniemi, J. 2024-06-27T13:44:32Z 395-404 application/pdf http://hdl.handle.net/10138/578037 eng eng Boreal Environment Research Publishing Board Boreal Environment Research 1239-6095 1797-2469 4 3 http://hdl.handle.net/10138/578037 Suomen ympäristökeskus CC BY 4.0 openAccess Artikkeli lehdessä 2024 ftunivhelsihelda 2024-08-21T23:48:04Z The effects of forestry on fish and fisheries were studied in the Isojoki basin, western Finland. The most abundant fish species in the study area, brown trout (Salmo trutta L.), was found in 27 of 50 brooks studied. Enzyme electrophoresis revealed at least five genetically differentiated stocks of brown trout in the brooks. Regression analysis indicated that the population density of brown trout was positively dependent on the abundance of pools, stony bottom material (2 to < 10 cm in diameter), undercut banks in the streams, and water pH, while the abundance of ditches in the catchment area and shading by the tree canopy affected the density negatively. Incubation experiments showed that sedimentation with mineral and humus material impaired the survival of trout eggs in the rapids. The results suggest that dredging of brooks and increased soil erosion due to drainage may threaten the reproduction and genetic diversity of trout stocks in the brooks and main river. Article in Journal/Newspaper Boreal Environment Research HELDA – University of Helsinki Open Repository |
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Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
description |
The effects of forestry on fish and fisheries were studied in the Isojoki basin, western Finland. The most abundant fish species in the study area, brown trout (Salmo trutta L.), was found in 27 of 50 brooks studied. Enzyme electrophoresis revealed at least five genetically differentiated stocks of brown trout in the brooks. Regression analysis indicated that the population density of brown trout was positively dependent on the abundance of pools, stony bottom material (2 to < 10 cm in diameter), undercut banks in the streams, and water pH, while the abundance of ditches in the catchment area and shading by the tree canopy affected the density negatively. Incubation experiments showed that sedimentation with mineral and humus material impaired the survival of trout eggs in the rapids. The results suggest that dredging of brooks and increased soil erosion due to drainage may threaten the reproduction and genetic diversity of trout stocks in the brooks and main river. |
format |
Article in Journal/Newspaper |
author |
Jutila, E. Ahvonen, A. Laamanen, M. Koskiniemi, J. |
spellingShingle |
Jutila, E. Ahvonen, A. Laamanen, M. Koskiniemi, J. Adverse impact of forestry on fish and fisheries in stream environments of the Isojoki basin, western Finland |
author_facet |
Jutila, E. Ahvonen, A. Laamanen, M. Koskiniemi, J. |
author_sort |
Jutila, E. |
title |
Adverse impact of forestry on fish and fisheries in stream environments of the Isojoki basin, western Finland |
title_short |
Adverse impact of forestry on fish and fisheries in stream environments of the Isojoki basin, western Finland |
title_full |
Adverse impact of forestry on fish and fisheries in stream environments of the Isojoki basin, western Finland |
title_fullStr |
Adverse impact of forestry on fish and fisheries in stream environments of the Isojoki basin, western Finland |
title_full_unstemmed |
Adverse impact of forestry on fish and fisheries in stream environments of the Isojoki basin, western Finland |
title_sort |
adverse impact of forestry on fish and fisheries in stream environments of the isojoki basin, western finland |
publisher |
Boreal Environment Research Publishing Board |
publishDate |
2024 |
url |
http://hdl.handle.net/10138/578037 |
genre |
Boreal Environment Research |
genre_facet |
Boreal Environment Research |
op_relation |
Boreal Environment Research 1239-6095 1797-2469 4 3 http://hdl.handle.net/10138/578037 Suomen ympäristökeskus |
op_rights |
CC BY 4.0 openAccess |
_version_ |
1810437299684507648 |