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Diazotrophy and diversity of benthic cyanobacteria in tropical coastal zones
Stockholm University, Faculty of Science, Department of Botany.
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Discoveries in recent years have disclosed the importance of marine cyano-bacteria in the context of primary production and global nitrogen cycling. It is hypothesized here that microbial mats in tropical coastal habitats harbour a rich diversity of previously uncharacterized cyanobacteria and that benthic marine nitrogen fixation in coastal zones is substantial.

A polyphasic approach was used to investigate cyanobacterial diversity in three tropical benthic marine habitats of different characters; an intertidal sand flat and a mangrove forest floor in the Indian Ocean, and a beach rock in the Pacific Ocean. In addition, nitrogenase activity was measured over diel cycles at all sites. The results revealed high cyanobacterial diversity, both morphologically and genetically. Substantial nitrogenase activity was observed, with highest rates at daytime where heterocystous species were present. However, the three habitats were dominated by non-heterocystous and unicellular genera such as Microcoleus, Lyngbya, Cyanothece and a large group of thin filamentous species, identified as members of the Pseudanabaenaceae family. In these consortia nocturnal nitrogenase activities were highest and nifH sequencing also revealed presence of non-cyanobacterial potential diazotrophs. A conclusive phylogenetic analysis of partial nifH sequences from the three sites and sequences from geographi-cally distant microbial mats revealed new clusters of benthic potentially ni-trogen-fixing cyanobacteria. Further, the non-heterocystous cyanobacterium Lyngbya majuscula was subjected to a physiological characterization to gain insights into regulatory aspects of its nitrogen fixation. The data demon-strated that nitrogenase activity is restricted to darkness, which called upon a re-evaluation of its diazotrophic behaviour.

Place, publisher, year, edition, pages
Stockholm: Botaniska institutionen , 2007. , 48 p.
Keyword [en]
Marine cyanobacteria, benthic nitrogen fixation, diversity, diazotrophy, Lyngbya majuscula, Zanzibar, western Indian Ocean
National Category
Botany
Identifiers
URN: urn:nbn:se:su:diva-6572ISBN: 91-7155-367-3 (print)OAI: oai:DiVA.org:su-6572DiVA: diva2:196664
Public defence
2007-02-02, föreläsningssalen, Botanicum, Lilla Frescativägen 5, Stockholm, 10:00
Opponent
Supervisors
Available from: 2007-01-11 Created: 2007-01-11Bibliographically approved
List of papers
1. Re-evaluation of the nitorgen fixation behaviour in the marine non-heterocystous cyanobacterium Lyngbya majuscula
Open this publication in new window or tab >>Re-evaluation of the nitorgen fixation behaviour in the marine non-heterocystous cyanobacterium Lyngbya majuscula
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2003 In: Journal of Phycology, ISSN 1529-8817, Vol. 39, no 2, 310-314 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-24055 (URN)
Note
Part of urn:nbn:se:su:diva-6572Available from: 2007-01-11 Created: 2007-01-11Bibliographically approved
2. Epilithic cyanobacterial communities of a marine tropical beach rock (Heron Island, Great Barrier Reef); diversity and diazotrophy
Open this publication in new window or tab >>Epilithic cyanobacterial communities of a marine tropical beach rock (Heron Island, Great Barrier Reef); diversity and diazotrophy
Manuscript (Other academic)
Identifiers
urn:nbn:se:su:diva-24056 (URN)
Note
Part of urn:nbn:se:su:diva-6572Available from: 2007-01-11 Created: 2007-01-11 Last updated: 2010-01-13Bibliographically approved
3. Variability in diazotrophy and cyanobacterial diversity in a tropical intertidal lagoon
Open this publication in new window or tab >>Variability in diazotrophy and cyanobacterial diversity in a tropical intertidal lagoon
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Manuscript (Other academic)
Identifiers
urn:nbn:se:su:diva-24057 (URN)
Note
Part of urn:nbn:se:su:diva-6572Available from: 2007-01-11 Created: 2007-01-11 Last updated: 2010-01-13Bibliographically approved
4. New nitrogen-fixing tropical marine cyanobacteria; a case-study of microbial mats in a mangrove habitat
Open this publication in new window or tab >>New nitrogen-fixing tropical marine cyanobacteria; a case-study of microbial mats in a mangrove habitat
Manuscript (Other academic)
Identifiers
urn:nbn:se:su:diva-24058 (URN)
Note
Part of urn:nbn:se:su:diva-6572Available from: 2007-01-11 Created: 2007-01-11 Last updated: 2010-01-13Bibliographically approved

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