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A woodland ecosystem The diagram shows an oak tree ecosystem. Note that different living things inhabit different zones or layers from the bottom to the top: First there is the zone of roots, soil and leaf-litter beneath the tree. Here decomposers such as bacteria, woodlice, and earthworms feed off last year's leaves and acorns, and fungi grow on its roots. Next is the trunk layer, which provides shelter or food to insects, caterpillars and larvae. Finally comes the branches, leaves and canopy. In this zone bees gather pollen and nectar, fungi grow on the leaves, gall wasps and moths lay their eggs, and squirrels gather acorns. Small birds such as bluetits hunt the moth larvae; and sparrowhawks hunt the small birds. An oak tree ecosystem. Each zone of the tree is home to a distinctive community of organisms Each of the organisms in this ecosystem has a particular way of fitting into the oak tree environment - they each occupy a niche within the ecosystem. For example the blue tits and the squirrels, though they both inhabit the same tree, do not directly compete for food: the squirrels feed on acorns, while the tits feed on moth larvae. The two species occupy different niches within the oak ecosystem.