AME 67:15-24 (2012)  -  DOI: https://doi.org/10.3354/ame01572

N2 fixation rates and associated diversity (nifH) of microbialite and mat-forming consortia from different aquatic environments in Mexico

Yislem Beltrán1, Carla M. Centeno1, Felipe García-Oliva2, Pierre Legendre3, Luisa I. Falcón1,*

1Instituto de Ecología, Universidad Nacional Autónoma de México (UNAM), Circuito Exterior sn, Ciudad Universitaria, Coyoacán, México City, Distrito Federal 04510, Mexico
2El Centro de Investigaciones en Ecosistemas (CIECO), Universidad Nacional Autónoma de Mexico, Morelia, Michoacán 58190, Mexico
3Département des Sciences Biologiques, Université de Montréal, CP 6128, Montréal, Québec H3C 3J7, Canada

ABSTRACT: The present study describes patterns and rates of N2 fixation and associated diversity (based on the nifH gene) of microbialite and mat-forming bacterial consortia from different aquatic environments in Mexico. All of the communities shared a diurnal pattern of N2 fixation with peak activity during the day while showing a unique genetic composition. Our study suggests the importance of heterocystous cyanobacteria as the main diazotrophic organisms, although nifH sequences were also affiliated to Oscillatoriales, Chroococcales, and several Proteobacteria. Genetic composition did not relate to the environmental variables analysed, although rates of nitrogenase activity associated to microbial C and N explained 11% of the variation among consortia.


KEY WORDS: N2 fixation · Microbialites · Microbial mats · nifH · Diversity · Community ecology


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Cite this article as: Beltrán Y, Centeno CM, García-Oliva F, Legendre P, Falcón LI (2012) N2 fixation rates and associated diversity (nifH) of microbialite and mat-forming consortia from different aquatic environments in Mexico. Aquat Microb Ecol 67:15-24. https://doi.org/10.3354/ame01572

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