Food choice of bacterial-feeding nematodes: The human pathogen Salmonella enterica compared to common soil bacteria

Hemmerling, Christin; Ackermann, Michael; Rueß, Liliane

doi:10.1016/j.apsoil.2023.105072

Cited by 1 publication

(3 citation statements)

References 46 publications

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“…Any bacteria larger in size or growing in dense micro-colonies or biofilms will thus efficiently reduce their palatability [75]. In addition, binary interaction assays established that bacterivorous nematodes can display food preferences among bacteria of the preferred size class [23,34,[36][37][38] and thus modulate the composition of bacterial soil communities by their grazing activity [41,46,47]. These pioneering insights were restricted to bacteria easy to grow in the laboratory.…”

Section: Discussionmentioning

confidence: 99%

“…In contrast, opportunistic nematode species that are common in many soils, such as Acrobeloides buetschlii (cp 2), are less sensitive to changes in food type and quantity. In the latter, this goes along with a narrow, muscular stoma and a lower pumping frequency with its pharynx [38][39][40].…”

Section: Introductionmentioning

confidence: 99%

“…Especially small-sized Gram-negative bacteria that fit the stoma of nematodes were reported to be preferred [34, 36, 37]. Also, a high water content, a high C/N ratio as a proxy for food quality as well as the respiration rate as a proxy for metabolic activity were identified as positive prey selection criteria of bacterivorous nematodes [23, 34, 38]. Differing life-history traits among nematode species are yet another differentiating factor and are commonly expressed as the colonizer-persister (cp) value [39, 40].…”

Section: Introductionmentioning

confidence: 99%

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Succession of bacteria and archaea within the soil micro-food web

Tamang,

Sikorski,

van Bommel

et al. 2024

Preprint

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Bacterivorous nematodes represent numerically abundant bacterial grazers in the soil micro-food web. Their trophic regulation shapes the soil microbiome, but the underlying population dynamics of bacteria and archaea are poorly understood. Here, we followed bulk soil respiration and time-resolved population dynamics (32 days) of bacterial and archaeal species in response to top-down control by a common bacterivorous soil nematode,Acrobeloides buetschlii, bottom-up control by resource amendment via maize litter as well as the combination of both. Addition of maize litter significantly increased soil respiration rates, while bacterivorous nematodes shifted the maximum rate of soil respiration from day 12 to day 6. Underlying bacterial and archaeal abundance changes could be separated into five major response types, dominating in different top-down and bottom-up control scenarios. Individual microbial species switched between response types depending on the different scenarios. In-depth analysis of these differential abundance patterns revealed a broad feeding behavior forA. buetschliion dominating populations of gram-negative bacteria (Acidobacteriota,Bacteroidota,Gemmatimonatoda,Pseudomonadota) and ammonia-oxidizing archaea (Nitrososphaerota), while discriminating against dominant populations of gram-positive bacteria (Actinobacteriota,Bacillota). Combined bottom-up control by maize litter and top-down control by nematode grazing caused a succession of soil microbiota, which was driven by population changes first in theBacteroidota, then in thePseudomonadota, and last in theAcidobacteriotaandNitrososphaerota. This mechanistic understanding of nematode grazing on soil microbiota population dynamics is essential to inform predictive models of the soil food web.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Succession of bacteria and archaea within the soil micro-food web

Tamang,

Sikorski,

van Bommel

et al. 2024

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

Food choice of bacterial-feeding nematodes: The human pathogen Salmonella enterica compared to common soil bacteria

Cited by 1 publication

References 46 publications

Succession of bacteria and archaea within the soil micro-food web

Succession of bacteria and archaea within the soil micro-food web

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