Species-rich but distinct arbuscular mycorrhizal communities in
reforestation plots on degraded pastures and in neighboring pristine
tropical mountain rain forest
Ingeborg Haug, Tesfaye Wubet, Michael Weiß, Nikolay Aguirre, Michael Weber, Sven Günter, Ingrid Kottke
Tropical Ecology 51(2): 125-148, 2010
For the first time in tropical mountain rain forest, arbuscular mycorrhizal fungal
richness and community composition was investigated from planted seedlings of Cedrela
montana, Heliocarpus americanus, Juglans neotropica and Tabebuia chrysantha in reforestation plots on degraded pastures. A segment of fungal 18S rDNA was sequenced from the mycorrhizas. Sequences were compared with those obtained from mycorrhizas of adult trees of 30 species in the neighboring, pristine tropical mountain rain forest. In total, 193 glomeromycotan sequences were analyzed, 130 of them previously unpublished. Members of Glomeraceae,
Acaulosporaceae, Gigasporaceae and Archaeosporales were found in both habitats, with Glomus Group A sequences being by far the most diverse and abundant. Glomus Group A sequence type richness did not appear to differ between the habitats; a large number was observed in both. Glomus Group A sequence type composition, however, was found distinctly different. Seedlings
were rarely colonized by fungi of the pristine forest but trapped a number of fungi known from other areas, which were rarely found in the pristine forest.
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