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Benthic growth of Gloeotrichia echinulata
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolutionary Biology, Limnology.
2003 (English)In: Hydrobiologia, ISSN 0018-8158, E-ISSN 1573-5117, Vol. 506, no 1, 189-193 p.Article in journal (Refereed) Published
Abstract [en]

Gloeotrichia echinulata is an akinete forming cyanobacterium with both a pelagic and a benthic phase. After germination of the akinete there is a short phase of growth on the sediment before the filaments develop gas vacuoles and migrate up into the water. It has been indicated that during the time of growth on the sediment surface the germlings take up nutrients. Those nutrients would be used during the pelagic phase as the pelagic colonies do not have a very efficient nutrient uptake. To test the length of the initial growth period `akinete colonies' were picked out of sediment samples from Lake Erken, Sweden, and placed on a thin layer of sediment in wellplates (Nunclon multidish, 48 wells) in an incubator with 17 °C and a light:dark cycle of 16:8 h. The plates were then studied under a stereomicroscope and pictures were taken one or two times per day for 20 days. Germination occurred in one third of the wells and the growth was recorded. The germlings formed bundles on the surface of the old akinete colony during the experiment. Several bundles were found on the same akinete colony. In the migration traps colonies and filament bundles were found. The morphology of filament bundles found in the migration traps was similar to the filament bundles found in the germination experiment which had reached a stage of development where they would soon be considered colonies.

Place, publisher, year, edition, pages
2003. Vol. 506, no 1, 189-193 p.
National Category
Ecology
Identifiers
URN: urn:nbn:se:uu:diva-90424DOI: 10.1023/B:HYDR.0000008570.03256.00OAI: oai:DiVA.org:uu-90424DiVA: diva2:162776
Available from: 2003-05-14 Created: 2003-05-14 Last updated: 2013-07-05Bibliographically 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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