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.authorKranabetter, J. Marty
dc.contributor.authorHarman-Denhoed, Rachael
dc.contributor.authorHawkins, Barbara J.
dc.date.accessioned2018-11-02T08:10:01Z
dc.date.copyright2018en_US
dc.date.issued2018-08
dc.description.abstractQuantifying 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.embargo2019-09-01
dc.description.reviewstatusRevieweden_US
dc.description.scholarlevelFacultyen_US
dc.description.sponsorshipFunding for this project was provided by the British Columbia Ministry of Forests, Lands and Natural Resource Operations.en_US
dc.identifier.citationHawkins, 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-2017-0154en_US
dc.identifier.urihttps://doi.org/10.1111/nph.15380
dc.identifier.urihttp://hdl.handle.net/1828/10230
dc.language.isoenen_US
dc.publisherNew Phytologisten_US
dc.subjectecosystem retrogressionen_US
dc.subjectholobionten_US
dc.subjectmutualismen_US
dc.subjectmycorrhizaen_US
dc.subjectphosphorus (P) deficiencyen_US
dc.subjectpodzolizationen_US
dc.titleSaprotrophic and ectomycorrhizal fungal sporocarp stoichiometry (C : N : P) across temperate rainforests as evidence of shared nutrient constraints among symbiontsen_US
dc.typePostprinten_US

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