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Tropical Monodominance: A Preliminary Test of the Ectomycorrhizal Hypothesis
Sylvia D. Torti and Phyllis D. Coley
Vol. 31, No. 2 (Jun., 1999), pp. 220-228
Published by: Association for Tropical Biology and Conservation
Stable URL: http://www.jstor.org/stable/2663785
Page Count: 9
You can always find the topics here!Topics: Plant roots, Forest canopy, Tropical forests, Trees, Mixed forests, Seedlings, Fungi, Mycorrhizae, Tropical rain forests, Species
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This study reports results from the first explicit test of the ectomycorrhizal hypothesis for tropical monodominance in the Ituri Forest of the Democratic Republic of Congo (formerly Zaire), where the canopy tree Gilbertiodendron dewevrei forms large, monospecific stands. To test the hypothesis that ectomycorrhizae are important to the success of dominant species, we surveyed the mycorrhizal status of dominant species, as well as other common, but not dominant, species in the forest. The survey reveals that two dominant species, Gilbertiodendron dewevrei and Julbernardia seretii, form ectomycorrhizae and vesicular-arbuscular mycorrhizae, while Cynometra alexandri, another dominant, forms only vesicular-arbuscular mycorrhizae. These results, along with those of other species in this and other forests, are discussed within the context of the ectomycorrhizal hypothesis for tropical mondominance. This study demonstrates that the relationship between EM and tropical monodominance is more complex than has been previously recognized.
Biotropica © 1999 Association for Tropical Biology and Conservation