Original paper

Incubation success of brown trout (Salmo trutta) eggs in boreal humic rivers affected by peatland drainage

Laine, Anne; Heikkinen, Kaisa; Sutela, Tapio

Archiv für Hydrobiologie - Hauptbände Volume 150 Number 2 (2001), p. 289 - 305

41 references

published: Jan 11, 2001

DOI: 10.1127/archiv-hydrobiol/150/2001/289

BibTeX file

ArtNo. ESP141015002006, Price: 29.00 €

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Abstract

Effects of peatland drainage on the incubation success of brown trout (Salmo trutta L.) eggs placed inside gravel-filled boxes were studied in two boreal humic rivers in northern Finland. The survival was 53-84 % at the eyed egg stage and as low as 0.2-9.l % at the pre-emergence stage, depending on the site. The lowest survivals were recorded at sites affected by peatland drainage. The survival was inversely related to particulate matter and Fe loading from drained peatlands. The results indicate that the increase in the Fe content of high molecular weight dissolved organic matter transported to rivers followed by its precipitation and sedimentation on the river bed may be a crucial factor in weakening the conditions for salmonid reproduction downstream of peatland drainage areas.

Keywords

Reproductionparticulate matteriron