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Acta Amazonica

versão impressa ISSN 0044-5967versão On-line ISSN 1809-4392


BANDEIRA, Adelmar G  e  HARADA, Ana Y. Density and vertical distribution of the soil Macroinvertebrates in clay and sandy soils in Central Amazonia. Acta Amaz. [online]. 1998, vol.28, n.2, pp.191-191. ISSN 0044-5967.

The density and vertical distribution of the soil macrofauna were studied in the Manaus region, Amazonas State, Brazil, in the wet and dry seasons, under three vegetation covers, in sandy and clay soils, during two years. The macroinvertebrates were hand sorted from soil cores of 20 x 20 x 30 cm (= 12 liters), divided in subsamples 5 cm thick. The method showed to be of low efficiency, mainly for collecting animals less than 2 mm length, difficult see with the naked eye. There were more animals in the sandy than in the clay soil. The most abundant groups were termites, ants and earthworms. Comparison between wet and dry seasons data showed that on the superficial strata (0-15 cm), more animals were found during the wet than in the dry season, and deeper in the soil (15-30 cm), they were more abundant during the dry season. This was interpreted as evidence of vertical migration of the soil macrofauna to the surface in the wet season and to the mineral soil in the dry season.

Palavras-chave : Soil macrofauna; vertical migration; density; vertical distribution.

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