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On the germination of the akinete-forming cyanobacterium Gloeotrichia echinulata, in Lake Erken, Sweden
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för evolutionsbiologi, Limnologi.
1999 Ingår i: Algological Studies, Vol. 94, s. 175-180Artikel i tidskrift (Refereegranskat) Published
Ort, förlag, år, upplaga, sidor
1999. Vol. 94, s. 175-180
Identifikatorer
URN: urn:nbn:se:uu:diva-90423OAI: oai:DiVA.org:uu-90423DiVA, id: diva2:162775
Tillgänglig från: 2003-05-14 Skapad: 2003-05-14Bibliografiskt granskad
Ingår i avhandling
1. Studies on the Life Cycles of Akinete Forming Cyanobacteria
Öppna denna publikation i ny flik eller fönster >>Studies on the Life Cycles of Akinete Forming Cyanobacteria
2003 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis, 2003. s. 39
Serie
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 856
Nyckelord
Biology, limnology, akinete, germination, recruitment, Biologi
Nationell ämneskategori
Biologiska vetenskaper
Forskningsämne
limnologi
Identifikatorer
urn:nbn:se:uu:diva-3432 (URN)91-554-5665-0 (ISBN)
Disputation
2003-06-04, Limnologens föreläsningssal, Norbyvägen 20, Uppsala, 10:00
Opponent
Handledare
Tillgänglig från: 2003-05-14 Skapad: 2003-05-14Bibliografiskt granskad

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