Tropical Monodominance: A Preliminary Test of the Ectomycorrhizal Hypothesis 1

  title={Tropical Monodominance: A Preliminary Test of the Ectomycorrhizal Hypothesis 1},
  author={Sylvia D. Torti and Phyllis D. Coley},
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… 
Ectomycorrhizal Associations Function to Maintain Tropical Monodominance
This chapter will explore recent research in the tropical forests that has revealed evidence for positive feedbacks between ECM fungi, ECM monodominant trees and con-specific ECM seedlings, which may explain the localmonodominance of an ECM tree species within the matrix of a typical high-diversity, predominantly AM rain forest community.
Ectomycorrhizal symbiosis of tropical African trees
A low level of host preference and dominance of multi-host fungal taxa on different African adult tree species and their seedlings were revealed, suggesting a potential for the formation of common ectomycorrhizal networks.
Dual mycorrhizal colonization of forest-dominating tropical trees and the mycorrhizal status of non-dominant tree and liana species
Examination of root vouchers from tree and liana species in monodominant Dicymbe corymbosa forest and an adjacent mixed rain forest in Guyana provides empirical data supporting the assumption that most tropical trees form AM associations for this region in the Guiana Shield and provides the first report of dual EM/AM colonization in Dicyre species.
Ectomycorrhizal fungi are shared between seedlings and adults in a monodominant Gilbertiodendron dewevrei rain forest in Cameroon
The authors' observations suggest that ectomycorrhizal fungal diversity is similar to that in other mixed tropical forests and provide the first report of the Tuber-Helvella lineage in a tropical forest.
Ectomycorrhizal fungal sporocarp diversity and discovery of new taxa in Dicymbe monodominant forests of the Guiana Shield
This is the first long-term ECM macrofungal dataset from an ECM-dominated Neotropical forest, and sporocarp diversity is comparable to that recorded forECM-diverse temperate and boreal forests.
Ectomycorrhizal fungi and their leguminous hosts in the Pakaraima Mountains of Guyana
The spatial restriction of EM fungal basidiomes indicated that discrete groves of EM trees harbour an important component of regional macromycete diversity.
Mycorrhizal status of some indigenous tree species in the Takamanda rainforest, South West Region, Cameroon
In both forest sites and habitat types, arbuscular mycorrhiza was the most represented among the tree species, and must be taken into consideration, when designing management strategies for this forest.
Does proximity to conspecific adults influence the establishment of ectomycorrhizal trees in rain forest
It is confirmed that mycorrhizal inoculum associated with conspecific adults is neither a prerequisite nor a guarantee of seedling establishment, but indicates that in some circumstances there might be benefits of being close to parents.
Multi-host ectomycorrhizal fungi are predominant in a Guinean tropical rainforest and shared between canopy trees and seedlings.
Variation in ECM fungal diversity according to the seedling versus adult development stage of trees and low host specificity of ECM fungi are revealed, and it is indicated that multi-host fungi are more abundant than single- host fungi in this forest stand.
Monodominance in an African Rain Forest: Is Reduced Herbivory Important? 1
Results showed that escape from herbivore and pathogen damage is not a mechanism by which Gilbertiodendron achieves dominance, as it suffered the highest damage level of any species surveyed.


Ectomycorrhizal rain-forest legumes and soil phosphorus in Korup National Park, Cameroon
The groves are characterized by high inputs of leaf litter in the dry season, extensive colonization of surface organic matter by ectomycorrhizas and hyphal strands, and high carbon: extractable inorganic phosphorus ratios in the mineral soil in the wet season.
Vesicular-arbuscular mycorrhizae in two tropical monodominant trees
The ability of some tropical trees to associate with EM has been hypothesized to give them a competitive advantage by which they can achieve local or regional dominance.
Monodominant and Species-Rich Forests of the Humid Tropics: Causes for Their Co-Occurrence
A study of the structure and floristics at a transition zone from a monodominant to a more diverse forest in the African humid tropics was conducted to elucidate the mechanisms maintaining floristic
Ectomycorrhizae as biological deterrents to pathogenic root infections.
  • D. Marx
  • Environmental Science
    Annual review of phytopathology
  • 1972
The infection of feeder roots of most flowering plants by symbiotic fungi and the transformation of these roots into unique morphological structures called mycorrhizae (fungus-roots) undoubtedly
Comparison of root and mycorrhizal characteristics in primary and secondary rainforest on a metamorphic soil in North Queensland, Australia
The dominance of ectomycorrhizas in the secondary forest was associated with the prevalence of Acacia aulacocarpa, and the results cannot be extended to other secondary forests in the region.
Seed, seedling and sub-canopy survival in monodominant and mixed forests of the Ituri Forest, Africa
Results suggest that, irrespective of mortality to seeds, the ability to persist in the understorey may confer on Gilbertiodendron a greater probability of reaching and dominating the canopy.
Role of Laccaria laccata in protecting primary roots of Douglas-fir from root rot
Phenolics induced by L. laccata in the primary root are associated with resistance and may be the chemical basis for root protection and antibiosis was judged unimportant in root protection.
Low-Diversity Tropical Rain Forests: Some Possible Mechanisms for Their Existence
It is suggested that after a single EM tree species achieves dominance in a type-I forest, other species in the same family are more likely to invade than are those of a different family, leading to a forest of higher diversity dominated by several species from a few families that associate with EM fungi.
Monospecific dominance in tropical rain forests.
  • T. Hart
  • Environmental Science
    Trends in ecology & evolution
  • 1990
Mycorrhiza and Litter Decomposition
In an experiment in which root activity and thus mycorrhizal activity were reduced in small areas of an unthinned Pinus radiata stand, three treatments were applied to 1 × 1 m plots sited between the trees.