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The Importance of Shallow Sediments in the Recruitment of Anabaena and Aphanizomenon (Cyanophyceae)
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolutionary Biology, Limnology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Limnology.
2004 (English)In: Journal of Phycology, ISSN 0022-3646, E-ISSN 1529-8817, Vol. 40, no 5, 831-836 p.Article in journal (Refereed) Published
Abstract [en]

Recruitment of Anabaena and Aphanizomenon from the sediments to the water column was investigated in shallow (1-2 m) and deep (6-7 m) areas of Lake Limmaren, central Sweden. Recruitment traps attached to the bottom were sampled weekly throughout the summer season (June through September). A comparison between the two sites shows that the largest part of the recruited cells originated from the shallow site, although recruitment occurred at all depths in the lake. There were also differences between the species, regarding the site as well as the timing of the recruitment. The contribution of the inoculum to the pelagic population was calculated to vary between 0.003% and 0.05% for the different species. From these results we conclude that shallow sediments are more important than deep ones for the recruitment and that the inoculum in Lake Limmaren is small but may still be an important factor in the population dynamics.

Place, publisher, year, edition, pages
2004. Vol. 40, no 5, 831-836 p.
National Category
URN: urn:nbn:se:uu:diva-90428DOI: 10.1111/j.1529-8817.2004.04070.xOAI: oai:DiVA.org:uu-90428DiVA: diva2:162780
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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