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Kransalger i Lillsjön: En studie av vattenkvaliteten i Lillsjön, med fokus på faktorer som påverkar Charas utbredning.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
2013 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The aim of this study was to investigate whether the water chemistry in lake Lillsjön have changed significantly due to human impact of surrounding areas. Lake Lillsjön is located outside the central parts of Östersund. It is an important recrational area, and has great natural values, among other things it is habitat for several species of Chara stoneworts. Chara requires clear calcareous water, high pH, relatively low levels of nitrate-nitrogen and low phosphorus concentrations. Lake Lillsjöns is recepient for surface water from a nearby commercial and industrial area, as well as melt water from an adjecent snow dump. Compared to ten other Chara-lakes in the region, lake Lillsjön shows higher concentration of total phosphorus and higher water colour. The study concludes that the surface water from surrounding areas, as well as melting water from the snow dump, are the main sources of the higher concentration of total phosphorus in lake Lillsjön. While the colour of the incoming water only shows a weak difference compared to the water colour of the reference lakes, the source of the higher water colour cannot be established. The water of lake Lillsjön can not be consider a suitable habitat for Chara

Place, publisher, year, edition, pages
2013. , 18 p.
Keyword [en]
Chara-lakes. Stoneworts. Charophytes. Water chemistry. Total phosphorus. Water colour. Lillsjön.
Keyword [sv]
Chara-sjöar. Kransalger. Vattenkemi. Totalfosfor. Färgtal. Lilljön.
National Category
Natural Sciences
URN: urn:nbn:se:umu:diva-80796OAI: diva2:651529
Available from: 2013-09-27 Created: 2013-09-26 Last updated: 2013-09-27Bibliographically approved

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