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Symbioses between cyanobacterial communities and feather mosses in boreal forests and consequences for dinitrogen fixation

Bay, Guillaume (2013). Symbioses between cyanobacterial communities and feather mosses in boreal forests and consequences for dinitrogen fixation. Diss. (sammanfattning/summary) Umeå : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2013:71
ISBN 978-91-576-7880-5
eISBN 978-91-576-7881-2
[Doctoral thesis]

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Feather moss-cyanobacteria associations, although still poorly understood, are recognised as essential for the regulation of nitrogen (N) input into N-limited ecosystems such as boreal forests due to their ability to carry out N2-fixation. This thesis aimed to investigate the diversity and composition of feather moss-associated cyanobacterial communities, the mechanisms by which cyanobacterial colonisation on mosses occurs and the fate of the N that they fix, and how various combinations of biotic and abiotic conditions influence cyanobacterial N2-fixation activity. The results demonstrated that the cyanobacterial communities associated with these mosses are highly host-specific and diverse, with moss species identity rather than environmental factors being the primary driver of their composition and diversity. Furthermore, cyanobacterial colonisation on feather mosses appears to be possible only if the plants are able to produce a chemo-attractant (to attract and guide cyanobacteria towards colonisation sites), the plant eventually gaining N from the cyanobacteria according to its needs. Moreover, the results reveal that both abiotic (light intensity, temperature) and biotic (host plant presence, cyanobacterial community composition, cyanobacterial density) factors must be considered when studying what causes variation in feather moss-cyanobacteria N2-fixation rates over time and space. Overall, the results of this thesis help in developing our understanding of the drivers of cyanobacterial communities on boreal feather mosses, and highlight the important role that these mosses play in the N cycle in boreal forest ecosystems, by hosting cyanobacteria and acquiring the N2 that they fix. In addition, this work also contributes to a better understanding of the complex interactions regulating biological N2-fixation, a major driver of ecosystem processes.

Authors/Creators:Bay, Guillaume
Title:Symbioses between cyanobacterial communities and feather mosses in boreal forests and consequences for dinitrogen fixation
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :16 October 2013
Number of Pages:80
I.Ininbergs, K., Bay, G., Rasmussen, U., Wardle, D. A. & Nilsson, M.-C. (2011). Composition and diversity of nifH genes of nitrogen-fixing cyanobacteria associated with boreal forest feather mosses. New Phytologist 192(2), 507-517.
II.Bay, G., Nahar, N., Oubre, M., Whitehouse, M., Wardle, D. A., Zackrisson, O., Nilsson, M.-C. & Rasmussen, U. (2013). Boreal mosses secrete chemical signals to gain nitrogen. New Phytologist (Rapid report) 200(1), 54-60.
III.Bay, G. N2-fixation by cyanobacterial communities associated with Pleurozium schreberi: effect of the interaction between light intensity, temperature and cyanobacterial species (manuscript).
Place of Publication:Umeå
Publisher:Department of Forest Ecology and Management, Swedish University of Agricultural Sciences
Associated Programs and Other Stakeholders:SLU - Environmental assessment > Programme Climate
SLU - Environmental assessment > Programme Forest
SLU - Research Areas for the Future > Future Forests (until Jan 2017)
SLU - Agricultural Sciences for Global Development > Land use and climate change
ISBN for printed version:978-91-576-7880-5
ISBN for electronic version:978-91-576-7881-2
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F40 Plant ecology
F Plant production > F60 Plant physiology and biochemistry
F Plant production > F61 Plant physiology - Nutrition
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Agrovoc terms:bryophyta, boreal forests, cyanobacteria, nitrogen fixing bacteria, nitrogen fixation, nutrient availability, biodiversity
Keywords:Boreal feather mosses, Cyanobacteria, Dinitrogen fixation, Symbiosis, Chemoattraction, Species diversity, nifH gene
Permanent URL:
ID Code:10854
Department:(S) > Dept. of Forest Ecology and Management
External funders:Carl Tryggers stiftelse för vetenskaplig forskning and Stiftelsen Oscar och Lili Lamms minne
Deposited By: Guillaume BAY
Deposited On:17 Oct 2013 08:54
Metadata Last Modified:02 Dec 2014 11:03

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