期刊
OIKOS
卷 119, 期 3, 页码 567-575出版社
WILEY
DOI: 10.1111/j.1600-0706.2009.17924.x
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资金
- NSF [06-10531, 06-10532, 08-45932]
- J.S. McDonnell Foundation
- Kellogg Biological Station [PIP 5355]
Nitrogen-fixers call 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 oil 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 oil 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.
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