Fate of soil bacteria and fungi in the gut of earthworms

Byzov, B. A.; Khomyakov, Nikita; Kharin, S. A.; Кураков, А. В.

doi:10.1016/j.ejsobi.2007.08.012

Cited by 72 publications

(40 citation statements)

References 16 publications

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“…As noted above, the disruption of large bacteria during gut passage might contribute to the selective occurrence of smaller ingested bacteria in the gut (8, 60, 61, 74,). Fluids that are toxic to certain bacteria are released into the gut lumen of A. caliginosa (10,35). Such toxic fluids might be dependent on the feeding guild and contribute to the differences detected in the present study.…”

Section: Discussionmentioning

confidence: 65%

Effect of Earthworm Feeding Guilds on Ingested Dissimilatory Nitrate Reducers and Denitrifiers in the Alimentary Canal of the Earthworm

Depkat-Jakob

Hilgarth

Horn

et al. 2010

Appl Environ Microbiol

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The earthworm gut is an anoxic nitrous oxide (N 2 O)-emitting microzone in aerated soils. In situ conditions of the gut might stimulate ingested nitrate-reducing soil bacteria linked to this emission. The objective of this study was to determine if dissimilatory nitrate reducers and denitrifiers in the alimentary canal were affected by feeding guilds (epigeic [Lumbricus rubellus], anecic [Lumbricus terrestris], and endogeic [Aporrectodea caliginosa]). Genes and gene transcripts of narG (encodes a subunit of nitrate reductase and targets both dissimilatory nitrate reducers and denitrifiers) and nosZ (encodes a subunit of N 2 O reductase and targets denitrifiers) were detected in guts and soils. Gut-derived sequences were similar to those of cultured and uncultured soil bacteria and to soil-derived sequences obtained in this study. Gut-derived narG sequences and narG terminal restriction fragments (TRFs) were affiliated mainly with Gram-positive organisms (Actinobacteria). The majority of gut-and uppermost-soil-derived narG transcripts were affiliated with Mycobacterium (Actinobacteria). In contrast, narG sequences indicative of Gram-negative organisms (Proteobacteria) were dominant in mineral soil. Most nosZ sequences and nosZ TRFs were affiliated with Bradyrhizobium (Alphaproteobacteria) and uncultured soil bacteria. TRF profiles indicated that nosZ transcripts were more affected by earthworm feeding guilds than were nosZ genes, whereas narG transcripts were less affected by earthworm feeding guilds than were narG genes. narG and nosZ transcripts were different and less diverse in the earthworm gut than in mineral soil. The collective results indicate that dissimilatory nitrate reducers and denitrifiers in the earthworm gut are soil derived and that ingested narG-and nosZ-containing taxa were not uniformly stimulated in the guts of worms from different feeding guilds.

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Section: Discussionmentioning

confidence: 65%

Effect of Earthworm Feeding Guilds on Ingested Dissimilatory Nitrate Reducers and Denitrifiers in the Alimentary Canal of the Earthworm

Depkat-Jakob

Hilgarth

Horn

et al. 2010

Appl Environ Microbiol

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“…The bacterial, fungal, and actinomycetes populations were higher in the midgut region than in the foregut and hindgut region. The selective activity of the gut fluid of earthworms could be a significant factor for the animal's nutrition as well as for regulating the steady state of the intestinal microbial community, and modification of microbial communities in soil (Byzov et al, 2007). Idowu (2006) reported that the aerobic bacterial counts in midgut of the earthworm, Libyodrillus violaceous was higher than that of foregut whereas the hindgut region recorded maximum.…”

Section: Total Microbial Populations In Vermicompost and Worm Gutsmentioning

confidence: 99%

Vermistabilization of pressmud using Perionyx ceylanensis Mich.

Prakash¹,

Karmegam

2010

Bioresource Technology

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“…Our estimates of CFU in substrates were in agreement with those of previous measurement of Dvo r ak et al [16] where culturable bacterial numbers in soil and compost inhabited by Eisenia worms reached 10 5 and 10 8 CFU g À1 dry matter, respectively. According to previous studies, the counts of bacteria isolated from the gut in compost earthworm E. fetida ranged from 10 6 to 10 9 CFU g À1 dry matter [14,67,68], whereas the counts of culturable bacteria in the gut contents of other earthworm species from different ecological groups (anecic Lumbricus terrestris, epigeic L. rubellus, and endogeic Aporrectodea caliginosa and Octolasion lacteum), reached only 10 5 e10 6 CFU g À1 dry matter [9,10]. The acceleration of the bacterial growth rate derived from gut and faeces of E. fetida correlates with the relatively low CFU observed in forest soil.…”

Section: Different Feeding Habitatsmentioning

confidence: 99%