期刊
ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY
卷 39, 期 -, 页码 80-86出版社
GAUTHIER-VILLARS/EDITIONS ELSEVIER
DOI: 10.1016/j.actao.2012.01.004
关键词
Mutualism; Parasitism; Cost; Benefit; Context-dependence; Nitrogen; Resource availability; Species interaction
类别
资金
- Michigan State University
- Provost's Office and Deans in the College of Natural Sciences
- College of Agriculture and Natural Resources
- College of Social Science
The relative abundance of traded resources can alter the outcomes of symbioses, potentially shifting mutually-beneficial interactions into interactions that are detrimental to one or both partners. We manipulated the legume-rhizobia symbiosis and light and nutrient levels to investigate how the net growth benefits to both partners shift across environments differing in the availability of both traded resources. In low nutrient, high light environments, rhizobia increased mean plant biomass by 62%. In contrast, when plants were light-limited, rhizobia did not increase above-ground biomass and reduced mean below-ground biomass by 46%. Similarly, rhizobia only increased plant biomass under low nutrient conditions. Resource availability also affected nodule traits correlated with rhizobia fitness, with light-limited plants producing fewer and smaller nodules. Our results suggest that the growth benefits to both partners in the legume-rhizobia symbiosis depend on the availability of both traded resources. We also detected evidence, however, that plants may reduce investment in symbionts as the net benefits of association decrease, potentially limiting how far this interaction shifts toward parasitism in low-light, high nutrient environments. (C) 2012 Elsevier Masson SAS. All rights reserved.
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