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Abstract:

Nitrogen-fixers can contribute significant amounts of nitrogen (N) and impact ecosystem functioning in diverse aquatic and terrestrial ecosystems. What determines N-fixer abundance still remains poorly understood. Here we experimentally investigate major environmental controls on the abundance of N-fixers: nitrogen to phosphorus (N:P) ratio and light. We grew a N-fixer, cyanobacterium Anabaena flos-aquae, in a multispecies community of freshwater phytoplankton in replicated factorial design treatments with two N:P ratios and two light levels. We show that low N:P ratios promote the dominance of the N-fixer in the community, but only under high light. Under low light, N:P ratio did not have a significant effect on the abundance of the N-fixer. N fixation occurred at low N:P only and increased with increasing light. In contrast, the density of non N-fixing cyanobacteria did not depend on N:P ratios. Green algae dominated under high N:P and high light only, exhibiting the opposite pattern of dominance to N-fixers. These results are consistent with patterns observed in nature and help explain the N-fixer distribution along the environmental gradients of nutrients and light. © 2009 The Authors. Journal compilation © 2010 Oikos.

Registro:

Documento: Artículo
Título:Interactive effects of N:P ratios and light on nitrogen-fixer abundance
Autor:Pinto, P.T.; Litchman, E.
Filiación:Depto de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, University de Buenos Aires, Argentina
Kellogg Biological Station and Zoology Dept, Michigan State University, Hickory Corners, MI 49060, United States
Palabras clave:abundance; cyanobacterium; dominance; ecosystem function; environmental gradient; experimental study; freshwater ecosystem; green alga; light availability; light effect; nitrogen fixation; nutrient availability; phosphorus; phytoplankton; population distribution; Anabaena flos-aquae; Chlorophyta; Cyanobacteria
Año:2010
Volumen:119
Número:3
Página de inicio:567
Página de fin:575
DOI: http://dx.doi.org/10.1111/j.1600-0706.2009.17924.x
Título revista:Oikos
Título revista abreviado:Oikos
ISSN:00301299
CODEN:OIKSA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00301299_v119_n3_p567_Pinto

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Citas:

---------- APA ----------
Pinto, P.T. & Litchman, E. (2010) . Interactive effects of N:P ratios and light on nitrogen-fixer abundance. Oikos, 119(3), 567-575.
http://dx.doi.org/10.1111/j.1600-0706.2009.17924.x
---------- CHICAGO ----------
Pinto, P.T., Litchman, E. "Interactive effects of N:P ratios and light on nitrogen-fixer abundance" . Oikos 119, no. 3 (2010) : 567-575.
http://dx.doi.org/10.1111/j.1600-0706.2009.17924.x
---------- MLA ----------
Pinto, P.T., Litchman, E. "Interactive effects of N:P ratios and light on nitrogen-fixer abundance" . Oikos, vol. 119, no. 3, 2010, pp. 567-575.
http://dx.doi.org/10.1111/j.1600-0706.2009.17924.x
---------- VANCOUVER ----------
Pinto, P.T., Litchman, E. Interactive effects of N:P ratios and light on nitrogen-fixer abundance. Oikos. 2010;119(3):567-575.
http://dx.doi.org/10.1111/j.1600-0706.2009.17924.x