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Pedogenesis shapes predator-prey relationships within soil microbiomes

成土作用 生态学 捕食 生物 生物量(生态学) 生态系统 捕食者 微生物群 生物多样性 物种丰富度 土壤生物学
作者
Wu Xiong,Manuel Delgado-Baquerizo,Qirong Shen,Stefan Geisen
出处
期刊:Science of The Total Environment [Elsevier BV]
卷期号:: 154405-154405
标识
DOI:10.1016/j.scitotenv.2022.154405
摘要

Pedogenesis determines soil physicochemical properties and many biodiversity facets, including belowground microbial bacteria and fungi. At the local scale, top-down predation by microbial protists regulates the soil microbiome, while the microbiome also affects protistan communities. However, it remains unknown how pedogenesis affects protistan communities and the potential protist-microbiome predator-prey relationships. With 435 soil samples representing different stages of pedogenesis ranging in soil age from centuries to millennia, we examined the influence of pedogenesis on the main protistan groups, and the interrelationships between protistan predators and microbial prey biomass. We revealed an enrichment in the diversity of total protists across pedogenesis and increasing richness of phototrophic protists in the medium compared with the early stages of pedogenesis. The richness of predatory protists accumulated throughout pedogenesis, which was more strongly determined by microbial biomass than environmental factors. Predator-prey associations were stronger in the young and the medium soils than in the older soils, likely because prey biomass accumulated in the latter and might be no longer limit predators. Together, our work provides evidence that pedogenesis shapes predatory protists differently than their prey, leading to shifts in predator-prey relationships. This knowledge is critical to better understand how soil food webs develop across soil development which might lead to changes in ecosystem functions. • We investigated protistan communities and microbial biomass across pedogenesis. • The diversity of predatory protists increased throughout pedogenesis. • The diversity of predatory protists was strongly determined by microbial biomass. • Predator-prey association was stronger in young and medium soils than in older soils.
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