Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Riparian vegetation responses to hydropeaking: Experimental study on germination and performance of plants along rivers regulated by hydropower dams in northern Sweden
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Riparian vegetation is one of the most complex and abundant ecosystems in the world and it provides important ecosystem services. These services are affected by electricity production from hydropower dams. Hydropower accounts for 16% of the global electricity production and almost 50% in Sweden. One effect of hydropower is sub-daily fluctuations of water level caused by the turbines being turned on and off according to electricity demand. This is referred to as hydropeaking and has largely unknown effects on the fluvial ecosystem, and especially on the riparian vegetation. No studies have been made on the effects of hydropeaking on riparian vegetation. In this study, three native plants (Carex acuta, Betula pubescens and Salix phylicifolia x myrsinifolia) and one non-native plant (Helianthus annuus) were used as indicators (i.e., phytometers) for the effects of hydropeaking along two rivers from northern Sweden; one used for hydropower production and the other free flowing. From each of the four species, seedlings of two sizes and seeds were transplanted into five different river reaches and bank elevations along a hydropeaking gradient from none to high hydropeaking intensity. C. acuta and S. phylicifolia x myrsinifolia showed significant positive relationships to the hydropeaking gradient, likely due to their natural high tolerance to frequent inundation events. Therefore, they are suitable for restoration of river shores along reaches affected by hydropeaking. In contrast, B. pubescens was negatively related to the hydropeaking gradient, losing leaves and biomass with increasing hydropeaking intensities. It turned out to be the most sensitive species among the ones used in the experiment making it suitable as an indicator. H. annuus showed no response and therefore did not serve as impact indicator or for restoration. Germination for all native species was significantly lower along the reaches affected by hydropeaking which indicates a strong connection between hydropeaking and germination. These findings showed that recruitment becomes a bottleneck in riparian communities’ conservation along rivers affected by hydropeaking, and highlight the importance of mitigation actions focused on favoring riparian species seeds’ germination.

Place, publisher, year, edition, pages
2016. , 29 p.
Keyword [en]
Hydropeaking, riparian vegetation, germination, survival, performance, phytometer, restoration, mitigation
National Category
Ecology
Identifiers
URN: urn:nbn:se:umu:diva-118745OAI: oai:DiVA.org:umu-118745DiVA: diva2:916102
Presentation
2016-03-21, Umeå, 21:34 (English)
Supervisors
Examiners
Available from: 2016-04-01 Created: 2016-03-31 Last updated: 2016-04-01Bibliographically approved

Open Access in DiVA

fulltext(1325 kB)114 downloads
File information
File name FULLTEXT01.pdfFile size 1325 kBChecksum SHA-512
22e857efee1d6db772d5df716eb1609998407d0b2a49b2600a99f09a4f2bfd00512089b2a46f8559170aa8de9abf3d9b9b604f45f0efeb748175be8fc8e7db6e
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Fredriksson, Emelie
By organisation
Department of Ecology and Environmental Sciences
Ecology

Search outside of DiVA

GoogleGoogle Scholar
Total: 114 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 171 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf