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Changes in microbial biomass and microbial activity of pig slurry after the transit through the gut of the earthworm Eudrilus eugeniae (Kinberg, 1867)

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Abstract

Here we studied the effects of gut transit through the earthworm Eudrilus eugeniae, on the physicochemical, biochemical, and microbial characteristics of pig slurry, by analyzing fresh casts. The reduction in the dissolved organic C contents in casts we recorded suggests that during digestion, earthworms assimilated labile organic C preferentially, which is a limiting growth factor for them. Furthermore, both microbial biomass and activity in pig slurry were significantly decreased by earthworm gut transit. It appears that E. eugeniae is able to digest microorganisms, although the addition of glucose to the food increased respiration, indicating that growth of microorganisms in casts could be limited by depletion of labile C. Despite reduced microbial biomass and activity, the metabolic diversity of microbial communities was greater in casts than in original pig slurry. Community level physiological profiles obtained from Biolog Ecoplate data revealed that, after earthworm gut transit, the microbial communities in casts and pig slurry were clearly differentiated by their physiological profiles. The results indicate that first stage in vermicomposting of pig slurry by E. eugeniae, i.e., casting, produced changes that will influence the dynamics of the organic matter degradation by reducing forms of N and C available to microorganisms, hence restricting their growth and multiplication. Nevertheless, the reduced microflora of casts was characterized by an increased catabolic potential that might lead to thorough degradation of pig slurry.

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Acknowledgements

This research was supported by CICYT (AGL2003-01570) and Xunta de Galicia (PGIDIT03PXIB30102PR) grants.

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  1. Departamento de Ecoloxía e Bioloxía Animal, Universidad de Vigo, 36310, Vigo, Spain

    Manuel Aira, Fernando Monroy & Jorge Domínguez

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  1. Manuel Aira
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  2. Fernando Monroy
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  3. Jorge Domínguez
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Correspondence to Manuel Aira.

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Aira, M., Monroy, F. & Domínguez, J. Changes in microbial biomass and microbial activity of pig slurry after the transit through the gut of the earthworm Eudrilus eugeniae (Kinberg, 1867). Biol Fertil Soils 42, 371–376 (2006). https://doi.org/10.1007/s00374-005-0047-4

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  • DOI: https://doi.org/10.1007/s00374-005-0047-4

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