A few large invertebrates (mainly earthwonns) and social insects (ants and termites) are
able to efficiently dig the soil and produce organo-mineral structures (casts and organomineral pellets that are resistant macroaggregates, mounds and nests) and a large variety of pores (galleries, chambers and voids resulting from an uncomplete backfilling of galleries). The size of these organisms allows the development of anisosymbiotic relationships with microflora in their proper gut, which is likely to be much more efficient than the external relationships in faecal pellets. Mineralisation linked to the dig stive process may be high, especially in grass eating termites that may assimilate up between 5 to 19% of the ingested organic matter depending on species and soil types, in the course of a gut transit that may last no more than 20' to 4 hours (Lavelle, 1988).
A few large invertebrates (mainly earthwonns) and social insects (ants and termites) areable to efficiently dig the soil and produce organo-mineral structures (casts and organomineral pellets that are resistant macroaggregates, mounds and nests) and a large variety of pores (galleries, chambers and voids resulting from an uncomplete backfilling of galleries). The size of these organisms allows the development of anisosymbiotic relationships with microflora in their proper gut, which is likely to be much more efficient than the external relationships in faecal pellets. Mineralisation linked to the dig stive process may be high, especially in grass eating termites that may assimilate up between 5 to 19% of the ingested organic matter depending on species and soil types, in the course of a gut transit that may last no more than 20' to 4 hours (Lavelle, 1988).
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