Regulation of Microbial Activities in Functional Domains of Roots and Invertebrates

Lavelle, Patrick; Rouland, C.; Diouf, M.; Binet, Françoise; Kersanté, Anne

doi:10.1007/3-540-26609-7_14

Cited by 13 publications

(24 citation statements)

References 54 publications

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“…Contrary to earthworm casts and termite mounds, ant artefacts seem to be mainly constituted by separated soil particles (Elmes 1991). Finally, specific microbial activities in the gut of some engineer species and in their fresh biostructures probably affect the OM molecular composition via the production of specific mucigel and cellular compounds (Martin & Marinissen 1993;Harry et al 2001;Lavelle et al 2004c).…”

Section:      mentioning

confidence: 99%

Specific functional signature in soil macro‐invertebrate biostructures

Hedde¹,

Lavelle²,

Joffre³

et al. 2005

Functional Ecology

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Summary1. The aim of this study was to search for specific signatures of biogenic structures (i.e. earthworm casts, termite sheathings and mound material, and ant deposits) made by 15 species of soil engineers in a Colombian savanna. We thus investigated the organic matter (OM) biochemical composition of biostructures using near infrared spectroscopy (NIRS) and its relationship with selected biological (respirometry) and chemical attributes. 2.We found significant differences in OM quality and potential respiration rate among biostructures. These results were attributed to production patterns of biostructures and invertebrate feeding behaviour. A multiple co-inertia analysis was performed with NIRS, respirometry and chemical results. It separated (i) carton termite mounds, (ii) earthworm casts and organo-mineral termite mounds and (iii) termite sheathings and ant deposits. 3. These results suggest that NIRS spectra might be used as 'fingerprints' to identify organisms responsible for soil aggregate production. Moreover, the ordination given by the co-inertia analysis is proposed as a basis for a functional classification of soil engineers, assuming that different biostructure properties imply different effects on soil functioning.

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Section:      mentioning

confidence: 99%

Specific functional signature in soil macro‐invertebrate biostructures

Hedde¹,

Lavelle²,

Joffre³

et al. 2005

Functional Ecology

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“…soil bioturbated by earthworms) harbouring higher activities (Nannipieri et al. 2003; Lavelle et al. 2005; Meysman et al.…”

Section: Introductionmentioning

confidence: 99%

“…The spatial heterogeneity of bacterial activities has often been shown to be related to discontinuities in nutrient resources in soils, with 'hot spots' such as the rhizosphere or drilosphere (i.e. soil bioturbated by earthworms) harbouring higher activities (Nannipieri et al 2003;Lavelle et al 2005;Meysman et al 2006;Monard et al 2008a). The activity of atrazinedegrading communities, for instance, was shown to be enhanced in the rhizosphere 'hot spot' (Piutti et al 2002).…”

Section: Introductionmentioning

confidence: 99%

atzgene expressions during atrazine degradation in the soil drilosphere

Monard¹,

Martin-Laurent²,

Devers‐Lamrani³

et al. 2010

Molecular Ecology

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One of the various ecosystemic services sustained by soil is pollutant degradation mediated by adapted soil bacteria. The pathways of atrazine biodegradation have been elucidated but in situ expression of the genes involved in atrazine degradation has yet to be demonstrated in soil. Expression of the atzA and atzD genes involved in atrazine dechlorination and s-triazine ring cleavage, respectively, was investigated during in situ degradation of atrazine in the soil drilosphere and bulked samples from two agricultural soils that differed in their ability to mineralize atrazine. Interestingly, expression of the atzA gene, although present in both soils, was not detected. Atrazine mineralization was greatest in Epoisses soil, where a larger pool of atzD mRNA was consistently measured 7 days after atrazine treatment, compared with Vezin soil (146 vs. 49 mRNA per 10(6)16S rRNA, respectively). Expression of the atzD gene varied along the degradation time course and was profoundly modified in soil bioturbated by earthworms. The atzD mRNA pool was the highest in the soil drilosphere (casts and burrow-linings) and it was significantly different in burrow-linings compared with bulk soil (e.g. 363 vs. 146 mRNA per 10(6)16S rRNA, 7 days after atrazine treatment in Epoisses soil). Thus, consistent differences in atrazine mineralization were demonstrated between the soil drilosphere and bulk soil. However, the impact of bioturbation on atrazine mineralization depended on soil type. Mineralization was enhanced in casts, compared with bulk soil, from Epoisses soil but in burrow-linings from Vezin soil. This study is the first to report the effects of soil bioturbation by earthworms on s-triazine ring cleavage and its spatial variability in soil.

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“…Moreover they serve as Water supply, Nutrient cycling, Soil formation, primary production, Flood erosion control, climate regulation..etc.. 1) Water supply: Invertebrates tend to decrease surface runoff by their effects on surface roughness, and water infiltration and they create structural porosity in soils. The diversity of pore shapes and sizes may allow soils to store water at a wide range of potentials [27,28]. 2) Nutrient cycling: Their contributions to nutrient cycling have been extensively studied and modeled: their principal contribution seems to result from the comminution of litter and the selective activation of microbial activities [28].…”

Section: Roles Of Soil Fauna In Ecosystem Goods and Servicesmentioning

confidence: 99%

Soil Fauna as Webmasters, Engineers and Bioindicators in Ecosystems: Implications for Conservation Ecology and Sustainable Agriculture

Ertiban¹

2019

AJLS

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Regulation of Microbial Activities in Functional Domains of Roots and Invertebrates

Cited by 13 publications

References 54 publications

Specific functional signature in soil macro‐invertebrate biostructures

Specific functional signature in soil macro‐invertebrate biostructures

atzgene expressions during atrazine degradation in the soil drilosphere

Soil Fauna as Webmasters, Engineers and Bioindicators in Ecosystems: Implications for Conservation Ecology and Sustainable Agriculture

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