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Factors regulating recruitment from the sediment to the water column in the bloom-forming cyanobacterium Gloeotrichia echinulata
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolutionary Biology, Limnology.
2004 (English)In: Freshwater Biology, ISSN 0046-5070, E-ISSN 1365-2427, Vol. 49, no 3, 265-273 p.Article in journal (Refereed) Published
Abstract [en]


1. The influence of light, temperature, sediment mixing and sediment origin (water depth) on the recruitment of the cyanobacterium Gloeotrichia echinulata was examined in the laboratory.

2. Light and temperature were the most important factors initiating germination in G. echinulata.

3. The extent of germination (recruited biovolume) was mainly regulated by temperature and sediment mixing. Furthermore, sediment mixing significantly enhanced the frequency of observed heterocysts and colonies.

4. Despite the fact that the deep and shallow sediments contained a similar number of akinete colonies, the highest recruitment occurred from shallow sediments, indicating that akinetes from shallow sediments have a higher viability than those from deeper parts of the lake.

5. Our results support the hypothesis that shallow sediments are more important than profundal sediments for the recruitment of G. echinulata to the pelagic zone.

Place, publisher, year, edition, pages
2004. Vol. 49, no 3, 265-273 p.
National Category
URN: urn:nbn:se:uu:diva-90425DOI: 10.1111/j.1365-2427.2004.01182.xOAI: oai:DiVA.org:uu-90425DiVA: diva2:162777
Available from: 2003-05-14 Created: 2003-05-14 Last updated: 2013-09-19Bibliographically approved
In thesis
1. Studies on the Life Cycles of Akinete Forming Cyanobacteria
Open this publication in new window or tab >>Studies on the Life Cycles of Akinete Forming Cyanobacteria
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Cyanobacteria which can form resting cells (in this case akinetes) are common in meso-eutrophic lakes in temperate regions, often dominating the phytoplankton communities during summer. The life cycles of akinete-forming cyanobacteria has been studied with Gloeotrichia echinulata as a model organism. Anabaena and Aphanizomenon were also included in a migration study. The focus of this thesis has been the factors influencing the processes of germination and subsequent growth, the factors influencing migration from the sediment, and the amount of growth occurring in the water.

Germination of G. echinulata was strongly favoured by light, and recruitment was highest from organic-rich sediments in shallow, sheltered littoral areas, between 0-3 m. Recruitment of Anabaena and Aphanizomenon was less light dependent, yet the highest recruitment occurred from shallow sediments (0-2 m). This means that organic-rich sediments (0-3 m) in shallow areas are the most important seed-banks of akinete-forming cyanobacteria. The inocula contributed only to a minor extent to the maximum pelagic populations. 4% for G. echinulata in the mesotrophic Lake Erken, and 0.03% for both Anabaena and Aphanizomenon in the eutrophic Lake Limmaren. This implies that processes of growth and division in the water are important for the maximum size of the pelagic population. Prolonged recruitment from the sediment strongly promoted establishment of the species in the water, especially G. echinulata.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2003. 39 p.
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 856
Biology, limnology, akinete, germination, recruitment, Biologi
National Category
Biological Sciences
Research subject
urn:nbn:se:uu:diva-3432 (URN)91-554-5665-0 (ISBN)
Public defence
2003-06-04, Limnologens föreläsningssal, Norbyvägen 20, Uppsala, 10:00
Available from: 2003-05-14 Created: 2003-05-14Bibliographically approved

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