Abstract
The contribution of mycorrhizal associations to maintaining tree diversity patterns in tropical rain forests is poorly known. Many tropical monodominant trees form ectomycorrhizal (EM) associations, and there is evidence that the EM mutualism contributes to the maintenance of monodominance. It is assumed that most other tropical tree species form arbuscular mycorrhizal (AM) associations, and while many mycorrhizal surveys have been done, the mycorrhizal status of numerous tropical tree taxa remains undocumented. In this study, we tested the assumption that most tropical trees form AM associations by sampling root vouchers from tree and liana species in monodominant Dicymbe corymbosa forest and an adjacent mixed rain forest in Guyana. Roots were assessed for the presence/absence of AM and EM structures. Of the 142 species of trees and lianas surveyed, three tree species (the monodominant D. corymbosa, the grove-forming D. altsonii, and the non-dominant Aldina insignis) were EM, 137 were exclusively AM, and two were non-mycorrhizal. Both EM and AM structures were observed in D. corymbosa and D. altsonii. These results provide empirical data supporting the assumption that most tropical trees form AM associations for this region in the Guiana Shield and provide the first report of dual EM/AM colonization in Dicymbe species. Dual colonization of the Dicymbe species should be further explored to determine if this ability contributes to the establishment and maintenance of site dominance.
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Acknowledgments
We thank Sami Kahn and Kathleen Bachinsky for lab assistance, Dr. Joseph Morton for technical advice, and David Bay for assisting with photography. This research was funded by The University of Michigan’s Block Grant and The University of Michigan Latin American and Caribbean Studies to KLM, and a National Geographic Society’s Committee for Research and Exploration grant to TWH. Research permits were granted by the Guyana Environmental Protection Agency.
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McGuire, K.L., Henkel, T.W., Granzow de la Cerda, I. et al. Dual mycorrhizal colonization of forest-dominating tropical trees and the mycorrhizal status of non-dominant tree and liana species. Mycorrhiza 18, 217–222 (2008). https://doi.org/10.1007/s00572-008-0170-9
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DOI: https://doi.org/10.1007/s00572-008-0170-9