The effects of acidity and aluminium leached from acid-sulphate soils on riverine fish assemblages
Drainage of acid-sulphate soils mainly for agriculture, increases oxidation and leads to extensive leaching of acidity and aluminium (Al) to rivers in western Finland. The lowest average pH (4.55) values and the highest average Al concentrations (7.4 mg l–1) were measured in the Vöyrinjoki, which ap...
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/578371 2024-09-09T19:34:19+00:00 The effects of acidity and aluminium leached from acid-sulphate soils on riverine fish assemblages Sutela, T. Vehanen, T. 2024-06-27T13:45:03Z 385-391 application/pdf http://hdl.handle.net/10138/578371 eng eng Boreal Environment Research Publishing Board Boreal Environment Research 1239-6095 1797-2469 22 http://hdl.handle.net/10138/578371 Suomen ympäristökeskus CC BY 4.0 openAccess Artikkeli lehdessä 2024 ftunivhelsihelda 2024-08-21T23:48:04Z Drainage of acid-sulphate soils mainly for agriculture, increases oxidation and leads to extensive leaching of acidity and aluminium (Al) to rivers in western Finland. The lowest average pH (4.55) values and the highest average Al concentrations (7.4 mg l–1) were measured in the Vöyrinjoki, which appeared to be void of fish. Frequency of sites with no fish was clearly the highest (59%) in rivers with average pH < 5. Total fish density and biomass were the highest at the sites with pH > 6. The two fish species that are most tolerant to acidity, pike (Esox lucius) and perch (Perca fluviatilis), were found in rivers with an average pH as low as 4.6. Acid-sensitive species, especially grayling (Thymallus thymallus), brown trout (Salmo trutta) and minnow (Phoxinus phoxinus), were usually not found in rivers with average water pH < 6. To mitigate acidification of river waters, controlled farmland drainage techniques should be applied. Article in Journal/Newspaper Boreal Environment Research HELDA – University of Helsinki Open Repository |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
description |
Drainage of acid-sulphate soils mainly for agriculture, increases oxidation and leads to extensive leaching of acidity and aluminium (Al) to rivers in western Finland. The lowest average pH (4.55) values and the highest average Al concentrations (7.4 mg l–1) were measured in the Vöyrinjoki, which appeared to be void of fish. Frequency of sites with no fish was clearly the highest (59%) in rivers with average pH < 5. Total fish density and biomass were the highest at the sites with pH > 6. The two fish species that are most tolerant to acidity, pike (Esox lucius) and perch (Perca fluviatilis), were found in rivers with an average pH as low as 4.6. Acid-sensitive species, especially grayling (Thymallus thymallus), brown trout (Salmo trutta) and minnow (Phoxinus phoxinus), were usually not found in rivers with average water pH < 6. To mitigate acidification of river waters, controlled farmland drainage techniques should be applied. |
format |
Article in Journal/Newspaper |
author |
Sutela, T. Vehanen, T. |
spellingShingle |
Sutela, T. Vehanen, T. The effects of acidity and aluminium leached from acid-sulphate soils on riverine fish assemblages |
author_facet |
Sutela, T. Vehanen, T. |
author_sort |
Sutela, T. |
title |
The effects of acidity and aluminium leached from acid-sulphate soils on riverine fish assemblages |
title_short |
The effects of acidity and aluminium leached from acid-sulphate soils on riverine fish assemblages |
title_full |
The effects of acidity and aluminium leached from acid-sulphate soils on riverine fish assemblages |
title_fullStr |
The effects of acidity and aluminium leached from acid-sulphate soils on riverine fish assemblages |
title_full_unstemmed |
The effects of acidity and aluminium leached from acid-sulphate soils on riverine fish assemblages |
title_sort |
effects of acidity and aluminium leached from acid-sulphate soils on riverine fish assemblages |
publisher |
Boreal Environment Research Publishing Board |
publishDate |
2024 |
url |
http://hdl.handle.net/10138/578371 |
genre |
Boreal Environment Research |
genre_facet |
Boreal Environment Research |
op_relation |
Boreal Environment Research 1239-6095 1797-2469 22 http://hdl.handle.net/10138/578371 Suomen ympäristökeskus |
op_rights |
CC BY 4.0 openAccess |
_version_ |
1809903783331758080 |