The effects of restoration on aquatic bryophytes and ice conditions: -A study in boreal streams in Västerbotten, Sweden.
Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
The objective with this thesis was to find out how aquatic bryophytes and ice cover in boreal tributaries are affected by channelization and different kinds of restoration. Furthermore, the importance of the substrate heterogeneity was investigated in the different streams. 17 reaches within tributaries to Vindelälven were a part of the study and were divided into four categories; natural (i.e. never been channelized), channelized, restored and re-restored. Data were collected during field work, i.e. bryophyte and substrate inventory during summer and ice surveys during winter. The results showed that both channelization and restoration were negative for the bryophyte cover, but that the bryophytes in the channelized streams seem to be repopulating the stream bed. No significant relationships between bryophytes and larger substrates were found, which does not correspond with earlier research. Nor could any clear relationships between ice and substrates be found. Whether restoration eliminated harmful ice formations or not remains unclear, but a few indications that the channelized streams had less cohesive surface ice but more anchor ice and aufeis were found. To verify the result of this study, more research is needed.
Place, publisher, year, edition, pages
2012. , 33 p.
channelization, restoration, bryophytes, ice, tributaries, Vindelälven (the Vindel River).
IdentifiersURN: urn:nbn:se:umu:diva-75806OAI: oai:DiVA.org:umu-75806DiVA: diva2:635474
Subject / course
Examensarbete i miljö och hälsoskydd
Bachelor of Science in Environmental Health
Malm Renöfält, Birgitta
Lavin Olofsson, Åsa, Univ. adjunkt