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Saprotrophic and ectomycorrhizal fungal sporocarp stoichiometry (C : N : P) across temperate rainforests as evidence of shared nutrient constraints among symbionts

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dc.contributor.author Kranabetter, J. Marty
dc.contributor.author Harman-Denhoed, Rachael
dc.contributor.author Hawkins, Barbara J.
dc.date.accessioned 2018-11-02T08:10:01Z
dc.date.copyright 2018 en_US
dc.date.issued 2018-08
dc.identifier.citation Hawkins, B.J., May, E. & Robbins, S. (2017). Nitrate and ammonium uptake in 21 common species of moss from Vancouver Island, British Columbia. Botany, 96(3), 201-208. https://doi.org/10.1139/cjb-2017-0154 en_US
dc.identifier.uri https://doi.org/10.1111/nph.15380
dc.identifier.uri https://dspace.library.uvic.ca//handle/1828/10230
dc.description.abstract Quantifying nutritional dynamics of free-living saprotrophs and symbiotic ectomycorrhizal fungi in the field is challenging, but the stoichiometry of fruiting bodies (sporocarps) may be an effective methodology for this purpose. Carbon (C), nitrogen (N) and phosphorus (P) concentrations of soils, foliage and 146 sporocarp collections were analyzed from 14 Pseudotsuga menziesii var. menziesii stands across a podzolization gradient on Vancouver Island (Canada). N and P concentrations were considerably higher in saprotrophic fungi. Fungal N% increased with soil N content at a greater rate for saprotrophs than ectomycorrhizal fungi, while fungal P% of saprotrophs was more constrained. Fungal N : P was more responsive to soil N : P for ectomycorrhizal fungi (homeostatic regulation coefficient ‘H’ = 2.9) than saprotrophs (H = 5.9), while N : P of ectomycorrhizal fungi and host tree foliage scaled almost identically. Results underscore the role of ectomycorrhizal fungi as nutrient conduits, supporting host trees, whereas saprotrophs maintain a greater degree of nutritional homeostasis. Site nutrient constraints were shared in equal measure between ectomycorrhizal fungi and host trees, particularly for P, suggesting neither partner benefits from enhanced nutrition at the expense of the other. Sporocarp stoichiometry provides new insights into mycorrhizal relationships and illustrates pervasive P deficiencies across temperate rainforests of the Pacific Northwest. en_US
dc.description.sponsorship Funding for this project was provided by the British Columbia Ministry of Forests, Lands and Natural Resource Operations. en_US
dc.language.iso en en_US
dc.publisher New Phytologist en_US
dc.subject ecosystem retrogression en_US
dc.subject holobiont en_US
dc.subject mutualism en_US
dc.subject mycorrhiza en_US
dc.subject phosphorus (P) deficiency en_US
dc.subject podzolization en_US
dc.title Saprotrophic and ectomycorrhizal fungal sporocarp stoichiometry (C : N : P) across temperate rainforests as evidence of shared nutrient constraints among symbionts en_US
dc.type Postprint en_US
dc.description.scholarlevel Faculty en_US
dc.description.reviewstatus Reviewed en_US
dc.description.embargo 2019-09-01


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