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By Rob Jenkins, C.K. Jain

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The form of the biogenic structure can be likened to simple Role of Soil Macrofauna 43 geometric forms in order to evaluate more easily the volume of soil moved through each type of structure on the soil surface. Through these structures, the organisms that produce them can modulate the availability or accessibility of one or more resources used by other organisms. g. predation, parasitism, 'mutualism and competition). There are several main groups of biogeniC structures that are commonly found in agricultural systems, with different importance and consequences in agro-ecosystems.

Compost Science and Utilization. Spring. p. 23-37. 3 Role of Soil Macrofauna Soil macrofauna consists of a large number of different organisms that live on the soil surface, in the soil spaces (pores) and in the soil area near roots. Their way of living, their feedings habits, their movements into the soil, their excretions and their death have direct and indirect impacts on their habitat. The biological activities of soil macrofauna regulate soil processes and soil fertility to a significant extent.

They move through it by displacing it in all directions. Millipedes are generally large- bodied arthropods that feed on plant debris (decomposed wood or leaf materials), leaving behind their numerous droppings that contribute to humus and soil formation. Figure 1. A centipede Centipedes are generally long, flattened, sometimes large-bodied animals that actively hunt and eat other invertebrates in the litter. However, some very small, unpigmented, blind centipede species (mostly Geophilomorpha) go down into the soil, foJ lowing galleries and crevices to about 50 cm.

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