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Pelagic growth and colony division of Gloeotrichia echinulata in Lake Erken
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.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Limnology.
2005 (English)In: Journal of Plankton Research, ISSN 0142-7873, E-ISSN 1464-3774, Vol. 27, no 2, 145-151 p.Article in journal (Refereed) Published
Abstract [en]

Gloeotrichia echinulata colony development was monitored in Lake Erken, Sweden and studied inenclosure experiments. Significant colonial division did not occur in mesh bags, although the abundance ofthe pelagic population in the lake increased during the experimental periods. On the basis of these findings,it is suggested that circulation of G. echinulata to deeper nutrient rich water supports pelagic growth. Insupport of this, a large part of the buoyant G. echinulata colonies in Lake Erken was found at severalmeters depth. In an experiment with nutrient additions, the only treatment that favoured G. echinulatadevelopment was additions of phosphate, nitrate and iron. Trace element additions had a negative effecton the development of G. echinulata. On the basis of these findings, the nutritional requirements ofG. echinulata are discussed.

Place, publisher, year, edition, pages
2005. Vol. 27, no 2, 145-151 p.
National Category
Ecology
Identifiers
URN: urn:nbn:se:uu:diva-90427DOI: 10.1093/plankt/fbh165OAI: oai:DiVA.org:uu-90427DiVA: diva2:162779
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.
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 856
Keyword
Biology, limnology, akinete, germination, recruitment, Biologi
National Category
Biological Sciences
Research subject
Limnology
Identifiers
urn:nbn:se:uu:diva-3432 (URN)91-554-5665-0 (ISBN)
Public defence
2003-06-04, Limnologens föreläsningssal, Norbyvägen 20, Uppsala, 10:00
Opponent
Supervisors
Available from: 2003-05-14 Created: 2003-05-14Bibliographically approved

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