First report of the ectomycorrhizal status of boletes on the Northern Yucatan Peninsula, Mexico determined using isotopic methods |
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Authors: | Niles J Hasselquist Greg W Douhan Michael F Allen |
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Institution: | (1) Center for Conservation Biology, University of California, Riverside, CA 92521, USA;(2) Department of Plant Pathology and Microbiology, University of California, Riverside, CA 92521, USA;(3) Department of Forest Ecology and Management, Swedish University of Agriculture Sciences (SLU), SE-901 83 Ume?, Sweden |
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Abstract: | Despite their prominent role for tree growth, few studies have examined the occurrence of ectomycorrhizal fungi in lowland,
seasonally dry tropical forests (SDTF). Although fruiting bodies of boletes have been observed in a dry tropical forest on
the Northern Yucatan Peninsula, Mexico, their occurrence is rare and their mycorrhizal status is uncertain. To determine the
trophic status (mycorrhizal vs. saprotrophic) of these boletes, fruiting bodies were collected and isotopically compared to
known saprotrophic fungi, foliage, and soil from the same site. Mean δ15N and δ13C values differed significantly between boletes and saprotrophic fungi, with boletes 8.0‰ enriched and 2.5‰ depleted in 15N and 13C, respectively relative to saprotrophic fungi. Foliage was depleted in 13C relative to both boletes and saprotrophic fungi. Foliar δ15N values, on the other hand, were similar to saprotrophic fungi, yet were considerably lower relative to bolete fruiting bodies.
Results from this study provide the first isotopic evidence of ectomycorrhizal fungi in lowland SDTF and emphasize the need
for further research to better understand the diversity and ecological importance of ectomycorrhizal fungi in these forested
ecosystems. |
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