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Temporal and spatial variation in quality of hyporheic water in one unregulated and two regulated boreal rivers
Karlstad University, Faculty of Social and Life Sciences, Department of Biology. (Naturresurs rinnande vatten)ORCID iD: 0000-0002-8738-8815
Karlstad University, Faculty of Social and Life Sciences, Centre for Climate and Safety.ORCID iD: 0000-0002-2992-9572
Karlstad University, Faculty of Social and Life Sciences, Department of Biology.ORCID iD: 0000-0002-3191-7140
2007 (English)In: River research and applications, ISSN 1535-1459, Vol. 23, no 8, p. 829-842Article in journal (Refereed) Published
Abstract [en]

This study describes the temporal and spatial variations in hyporheic water quality in three boreal rivers, the River Tobyälven, an unregulated river, the river Mangälven, a regulated river with a minimum discharge requirement and the river Järperudsälven, aregulated river without any minimum discharge requirements. A total of 43 permanent piezometers were used to measure dissolved oxygen (DO), temperature, electrical conductivity, pH, NO3 and NHþ4in the hyporheic water at 150mm and 300mmdepth, at monthly intervals from October 2001 to October 2002. Another seven piezometers were installed in brown trout redds and monitored during the incubation period, from December 2001 to April 2002. In the river Tobyälven, temporal patterns in hyporheic water chemistry correlated to variations in surface water chemistry and discharge. In the river Järperudsälven, the hyporheic water chemistry did not correlate to discharge or surface water chemistry. In the river Mangälven, the water chemistry was dominated by releases from a large upstream lake, and there were weak correlations between surface water chemistry and hyporheic water chemistry at some sites. The incubation conditions for brown trout eggs were most favourable in the unregulated river, characterized by high DO levels that remained high throughout the incubation period. In the river Järperudsälven the DO levels were variable during spawning, and then gradually declined to critically low levels during incubation, whereas in the river Mangälven the DO conditions were intermediate and stable. Thus we observed a stronger coupling between surface water conditions and hyporheic conditions, i.e. vertical connectivity, in the unregulated river than in the regulated river with minimum flow requirements, which in turn was stronger than in the river without minimum flow requirements.

Place, publisher, year, edition, pages
Chichester: John Wiley & Sons, 2007. Vol. 23, no 8, p. 829-842
Keywords [en]
flow regulation; hyporheic water chemistry; flow requirements; incubation; vertical connectivity
National Category
Ecology
Research subject
Biology
Identifiers
URN: urn:nbn:se:kau:diva-1978DOI: 10.1002/rra.1015OAI: oai:DiVA.org:kau-1978DiVA, id: diva2:5272
Available from: 2008-02-05 Created: 2008-02-05 Last updated: 2019-07-12Bibliographically approved
In thesis
1. Re-establishment of connectivity for fish populations in regulated rivers
Open this publication in new window or tab >>Re-establishment of connectivity for fish populations in regulated rivers
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The hydropower industry has altered connectivity in many rivers during the last century. Many fish species depend on both an intact longitudinal connectivity to be able to migrate between spawning, feeding and winter habitats, and vertical connectivity for development and survival of incubating embryos and larvae in the gravel. The objective of this thesis was to examine problems and remedial measures associated with disrupted longitudinal and vertical connectivity in regulated rivers. The issue of longitudinal connectivity was studied in the River Emån by evaluating the efficiency of two nature-like fishways for anadromous brown trout. Telemetry studies showed that the combined efficiency for the two fishways in 2001-2004 was 60.5%. The passage efficiencies of both fishways were high for trout (89-100%), but also for other species such as chub, perch, tench, burbot and roach (74%). The attraction efficiencies were largely dependent on power plant operation, and generally high for the fishway situated next to the tail-race and low for the fishway situated inside the former channel. More than half of the trout spawners were also observed using the fishways for downstream passage. The densities of brown trout yearlings upstream of the fishways were higher after the fishways were built than during pre-fishway years. Smolts produced upstream of the fishways were observed migrating downstream in 2003-2005. The percentage of smolts that passed both power plants in was 51%, with losses being attributed to predation (15%), turbine-induced mortality (16%) and other reasons (18%). Turbine-induced mortality was higher (40%) at the power plant with four small Francis runners, than at the power plant with one large Kaplan runner (12%). The issue of vertical connectivity was studied in three rivers in Värmland, one unregulated, and two regulated, one of which had no minimum flow requirements. In the unregulated river, temporal patterns in hyporheic water chemistry correlated to variation in surface water chemistry and discharge as expected. In the regulated rivers, the hyporheic water chemistry showed little correlation to discharge or surface water chemistry. The intra-gravel water chemistry conditions for brown trout eggs were more favourable in the unregulated river, characterised by high oxygen levels, than in the two regulated rivers. The regulated river with no minimum flow requirements had critically low oxygen levels at the end of the incubation period.

Place, publisher, year, edition, pages
Fakulteten för samhälls- och livsvetenskaper, 2005
Series
Karlstad University Studies, ISSN 1403-8099 ; 2005:56
Keywords
Attraction efficiency, Connectivity, Flow regime, Hyporheic water quality, Nature-like fishway, Passage efficiency, Regulated river, Remedial measures, Salmo trutta
National Category
Biological Sciences
Research subject
Biology
Identifiers
urn:nbn:se:kau:diva-1400 (URN)91-7063-028-3 (ISBN)
Public defence
2006-01-27, Andersalen, 11D 121, Karlstads universitet, Karlstad, 13:00
Opponent
Supervisors
Available from: 2008-02-05 Created: 2008-02-05

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Publisher's full texthttp://onlinelibrary.wiley.com/doi/10.1002/rra.1015/pdf

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Calles, OlleNyberg, LarsGreenberg, Larry

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