Diversity of Arbuscular Mycorrhizal Fungi in the Ecuadorian Amazon Region

Duchicela, Jéssica; Valdivieso, A.; Prado-Vivar, Belén; Arévalo-Granda, V.; Hickey-Darquea, Aileen; Hof, Pieter van ‘t

doi:10.1007/978-3-031-12994-0_7

Cited by 2 publications

(2 citation statements)

References 38 publications

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“…This microbial biodiversity has been relatively well described for the Amazon regions of Colombia, Brazil, Venezuela, and Peru, whereas many microorganisms, including bacteria and fungi, but also insects are still largely unknown for the Amazon rainforest of Ecuador (Cañarte et al, 2020). Our research team recently published that the mycorrhizal diversity as mentioned in literature studies at the Ecuadorian Amazon is similar to other studies in the Amazon region but concluded that the number of undescribed mycorrhizal species in the tropical forests of Ecuador need more attention as patterns of occurrence and diversity remain largely unknown (Duchicela et al, 2022).…”

Section: Introductionsupporting

confidence: 75%

Exploring the mycobiome and arbuscular mycorrhizal fungi associated with the rizosphere of the genus Inga in the pristine Ecuadorian Amazon

Arévalo-Granda

Hickey-Darquea²,

Prado-Vivar³

et al. 2023

Front. Fungal Biol.

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This study explored the composition of the mycobiome in the rhizosphere of Inga seedlings in two different but neighboring forest ecosystems in the undisturbed tropical Amazon rainforest at the Tiputini Biodiversity Station in Ecuador. In terra firme plots, which were situated higher up and therefore typically outside of the influence of river floods, and in várzea plots, the lower part of the forest located near the riverbanks and therefore seasonally flooded, tree seedlings of the genus Inga were randomly collected and measured, and the rhizosphere soils surrounding the root systems was collected. Members of the Fabaceae family and the genus Inga were highly abundant in both forest ecosystems. Inga sp. seedlings collected in terra firme showed a lower shoot to root ratio compared to seedlings that were collected in várzea, suggesting that Inga seedlings which germinated in várzea soils could invest more resources in vegetative growth with shorter roots. Results of the physical-chemical properties of soil samples indicated higher proportions of N, Mo, and V in terra firme soils, whereas várzea soils present higher concentrations of all other macro- and micronutrients, which confirmed the nutrient deposition effect of seasonal flooding by the nearby river. ITS metabarcoding was used to explore the mycobiome associated with roots of the genus Inga. Bioinformatic analysis was performed using Qiime 2 to calculate the alpha and beta diversity, species taxonomy and the differential abundance of fungi and arbuscular mycorrhizal fungi. The fungal community represented 75% of the total ITS ASVs, and although present in all samples, the subphylum Glomeromycotina represented 1.42% of all ITS ASVs with annotations to 13 distinct families, including Glomeraceae (72,23%), Gigasporaceae (0,57%), Acaulosporaceae (0,49%). AMF spores of these three AMF families were morphologically identified by microscopy. Results of this study indicate that AMF surround the rhizosphere of Inga seedlings in relatively low proportions compared to other fungal groups but present in both terra firme and várzea Neotropical ecosystems.

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Section: Introductionsupporting

confidence: 75%

Exploring the mycobiome and arbuscular mycorrhizal fungi associated with the rizosphere of the genus Inga in the pristine Ecuadorian Amazon

Arévalo-Granda

Hickey-Darquea²,

Prado-Vivar³

et al. 2023

Front. Fungal Biol.

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“…These are also species of high commercial value, while the Inga spp. provide food and incorporate nitrogen into the soil [53][54][55]; evidencing that the most common tree species found throughout the altitudinal gradient are of interest to provide shade, food and commercial timber similar to the findings of [56], and they are part of the native tree diversity, this could be due to the fact that the producers in the study area still have between 17% and 40% of remaining forests in the surroundings of the pastures [21].…”

Section: Dominant Tree Speciesmentioning

confidence: 58%

Carbon Stock Assessment in Silvopastoral Systems along an Elevational Gradient: A Study from Cattle Producers in the Sumaco Biosphere Reserve, Ecuadorian Amazon

et al. 2022

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Silvopastoral system (SPS) has been considered as a sustainable management system contribute to greenhouse gas (GHG) reduction, among other benefits compared with open pasture. However, little research has been conducted on the soil and tree biomass carbon stored in traditional pasture with dispersed trees (PWT) compared with pasture in monoculture (PM). The present study was conducted in the Ecuadorian Amazon Region (EAR), along an elevational gradient from 400 to 2000 masl., within the buffer and transition zone of the Sumaco Biosphere Reserve (SBR), using 71 temporary circular plots of 2826 m2, where 26 plots were stablished in PWT and 45 plots in PM. The main results in PWT show significant differences (p ≤ 0.01) between aboveground carbon biomass (AGCtrees) from 41.1 (lowlands), 26.5 (Middle hills) and 16.7 (high mountains) Mg ha−1 respectively, with an average of 31.0 Mg ha−1 in the whole study area. The total carbon pool along the altitudinal gradient in five components: (AGCtrees), belowground carbon (BGCtrees), pasture carbon (AGClitter+pasture) and carbon in soil components (0–10 and 10–30 cm) for PWT ranged from 112.80 (lowlands) to 91.34 (high mountains) Mg ha−1; while for the PM systems assessing three components (AGClitter+pasture) and carbon in soil components (0–10 and 10–30 cm) ranged from 52.5 (lowlands) to 77.8 (middle zone) Mg ha−1. Finally, the paper shows the main dominant tree species in pasture systems that contribute to carbon storage along elevational gradient and concludes with recommendations for decision-making aimed at improving cattle ranching systems through a silvopastoral approach to mitigate the effects of climate change.

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Diversity of Arbuscular Mycorrhizal Fungi in the Ecuadorian Amazon Region

Cited by 2 publications

References 38 publications

Exploring the mycobiome and arbuscular mycorrhizal fungi associated with the rizosphere of the genus Inga in the pristine Ecuadorian Amazon

Exploring the mycobiome and arbuscular mycorrhizal fungi associated with the rizosphere of the genus Inga in the pristine Ecuadorian Amazon

Carbon Stock Assessment in Silvopastoral Systems along an Elevational Gradient: A Study from Cattle Producers in the Sumaco Biosphere Reserve, Ecuadorian Amazon

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