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Global distribution patterns of mycorrhizal associations: abundance, environmental drivers and ecological impacts
Barcelo, M. 2022
Global distribution patterns of mycorrhizal associations: abundance, environmental drivers and ecological impacts
Doctoral Thesis
open access
2023-04-26T00:00:00Z; 2023-04-26T00:00:00Z
Mycorrhizas are symbiotic associations between soil fungi and most plant species. Despite its recognized ecological relevance, quantitative information about the abundance patterns of distinct... Show moreMycorrhizas are symbiotic associations between soil fungi and most plant species. Despite its recognized ecological relevance, quantitative information about the abundance patterns of distinct mycorrhizal plants and fungal types and their environmental drivers and ecological implications across different biomes is incomplete. This thesis quantitatively explores the aboveground and belowground abundance patterns of arbuscular mycorrhiza, ectomycorrhiza and ericoid mycorrhiza and the ecosystem properties derived from these patterns. Taken all together, the chapters of this thesis highlight the need of considering the specific environmental context when assessing mycorrhizal impacts on ecosystem functioning. Evaluating mycorrhizal-mediated ecosystem processes based solely on the abundance of AM, EcM and ErM plants may be misrepresentative. Specific climatic conditions, the abundances of the fungal partners, the microbial community composition or species-specific plant and fungal traits should also be taken into account. New theoretical frameworks need to be developed that allow more accurate predictions on mycorrhizal influence on biogeochemical cycles. Show less
Climate drives the spatial distribution of mycorrhizal host plants in terrestrial ecosystems
Barceló, M.; Bodegom, P.M. van; Soudzilovskaia, N.A. 2019
Climate drives the spatial distribution of mycorrhizal host plants in terrestrial ecosystems
Article / Letter to editor
open access
  1. Mycorrhizal associations have massive impacts on ecosystem functioning, but the mode and magnitude heavily depend on the mycorrhizal type involved. Different types of mycorrhizas are recognized to...

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  1. Mycorrhizal associations have massive impacts on ecosystem functioning, but the mode and magnitude heavily depend on the mycorrhizal type involved. Different types of mycorrhizas are recognized to predominate under different environmental conditions. However, the respective importance of climate and soil characteristics in shaping mycorrhizal global distributions are still poorly understood.
  2. We provide a quantitative and comprehensive global analysis of the main climatic and edaphic predictors of the distribution of plants featuring different mycorrhizal types. Estimates on per grid‐cell relative above‐ground biomass of plants holding arbuscular mycorrhiza (AM), ectomycorrhiza (EcM) and ericoid mycorrhiza (ErM) association were related to a set of 39 climatic and edaphic variables. We assessed their relationship by applying a Generalized Additive Models for Location, Scale and Shape (GAMLSS).
  3. The best GAMLSS models were able to explain 55%, 41% and 46% of the variance in AM, EcM and ErM distribution, respectively. Temperature‐related factors were the main predictors of distribution patterns for the three different mycorrhizal plant types. AM plants are favoured by warm climates, while EcM plants’ dominance (and to some extent ErM plants too) is favoured by colder climates.
  4. Synthesis. The observed lack of importance of soil drivers challenges the predominant view that mycorrhizal plants distribution mainly reflects soil type preferences—as related to its nutrient foraging strategies—of the different mycorrhizal types. Instead, our results highlight climate—and particularly temperature—as the main force shaping the distribution of arbuscular mycorrhiza, ectomycorrhiza and ericoid mycorrhiza host plants at the global scale and suggest that climate change can significantly alter the distribution of mycorrhizal host plants, with a subsequent impact on ecosystem functioning.

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Global patterns of mycorrhizal colonization intensity explained by climate and soil conditions
Soudzilovskaia, N.A.; Douma, J.C.; Akhmetzhanova, A.A.; Bodegom, P.M. van; Cornwell, W.K.; Moens, E.; ... ; Cornelissen, J.H.C. 2015
Global patterns of mycorrhizal colonization intensity explained by climate and soil conditions
Article / Letter to editor
metadata only
AimMost vascular plants on Earth form mycorrhizae, a symbiotic relationship between plants and fungi. Despite the broad recognition of the importance of mycorrhizae for global carbon and nutrient... Show moreAimMost vascular plants on Earth form mycorrhizae, a symbiotic relationship between plants and fungi. Despite the broad recognition of the importance of mycorrhizae for global carbon and nutrient cycling, we do not know how soil and climate variables relate to the intensity of colonization of plant roots by mycorrhizal fungi. Here we quantify the global patterns of these relationships.LocationGlobal.MethodsData on plant root colonization intensities by the two dominant types of mycorrhizal fungi world-wide, arbuscular (4887 plant species in 233 sites) and ectomycorrhizal fungi (125 plant species in 92 sites), were compiled from published studies. Data for climatic and soil factors were extracted from global datasets. For a given mycorrhizal type, we calculated at each site the mean root colonization intensity by mycorrhizal fungi across all potentially mycorrhizal plant species found at the site, and subjected these data to generalized additive model regression analysis with environmental factors as predictor variables.ResultsWe show for the first time that at the global scale the intensity of plant root colonization by arbuscular mycorrhizal fungi strongly relates to warm-season temperature, frost periods and soil carbon-to-nitrogen ratio, and is highest at sites featuring continental climates with mild summers and a high availability of soil nitrogen. In contrast, the intensity of ectomycorrhizal infection in plant roots is related to soil acidity, soil carbon-to-nitrogen ratio and seasonality of precipitation, and is highest at sites with acidic soils and relatively constant precipitation levels.Main conclusionsWe provide the first quantitative global maps of intensity of mycorrhizal colonization based on environmental drivers, and suggest that environmental changes will affect distinct types of mycorrhizae differently. Future analyses of the potential effects of environmental change on global carbon and nutrient cycling via mycorrhizal pathways will need to take into account the relationships discovered in this study.  Show less