uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Temperature as a driver for the expansion of the microalga Gonyostomum semen in Swedish lakes
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
2012 (English)In: Harmful Algae, ISSN 1568-9883, E-ISSN 1878-1470, Vol. 18, 65-73 p.Article in journal (Refereed) Published
Abstract [en]

Gonyostomum semen (Ehrenb) Diesing is a bloom-forming and noxious phytoplankton species, that usually occurs in brown-water lakes and which is often referred to as an invasive species. The aim of our study was to analyze changes over time in the occurrence and distribution of blooms, and to find possible drivers of this change. We also performed spatial analyses to identify environmental factors coupled to Gonyostomum's distribution. The effect of temperature on key processes in the Gonyostomum life cycle was further investigated experimentally to determine potential mechanistic causes. Our results show that G. semen has expanded in Swedish lakes since 1988. At the turn of the Millennium it was present in more than a quarter of the lakes included in the Swedish national lake monitoring program. Gonyostomum-lakes have significantly higher DOC, higher nutrient levels, and lower pH than non-Gonyostomum lakes. Trend analyses show a significant increase in the number of lakes with Gonyostomum, as well as in biomass and occurrence in samples. One explanation is that we more often find water temperatures exceeding 6 degrees C, which is also the threshold for positive growth in our laboratory experiments. Moreover, according to our partial least square regression model (PLS) analysis in one lake, we find that the increase in biomass is a function of temperature in combination with other factors. Thus, we conclude that an increase in water temperature resulting in longer growth season may be a driver of the expansion of Gonyostomum. However, temperature alone cannot explain why the species has expanded to new lakes within the same climatic region. Possibly an interplay between DOC and temperature can explain the patterns observed. 

Place, publisher, year, edition, pages
2012. Vol. 18, 65-73 p.
Keyword [en]
Nuisance alga, Gonyostomum semen, Invasive species, Climate change, Raphidophyceae
National Category
Biological Sciences
URN: urn:nbn:se:uu:diva-177869DOI: 10.1016/j.hal.2012.04.005ISI: 000305860600007OAI: oai:DiVA.org:uu-177869DiVA: diva2:541585
Available from: 2012-07-19 Created: 2012-07-19 Last updated: 2012-07-19Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Weyhenmeyer, Gesa A.
By organisation
In the same journal
Harmful Algae
Biological Sciences

Search outside of DiVA

GoogleGoogle Scholar
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

Altmetric score

Total: 161 hits
ReferencesLink to record
Permanent link

Direct link