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Esse trabalho tem como finalidade fornecer informacoes sobre um teste pioneiro ( bait-lamina test ) utilizado nos Campos do Sul do Brasil com a finalidade de avaliar a atividade alimentar dos invertebrados do solo – um indicativo de taxas de decomposicao da serapilheira nos ecossistemas. Descreve-se o comportamento alimentar durante dois meses, acessando a profundidade do solo (0-8 cm) na qual ocorre maior consumo e analisando duas formas de quantificacao deste consumo (tecnica conservativa X tecnica pratica) em dois diferentes ecossistemas campestres. Foram estabelecidas 100 unidades amostrais (u.a.) independentemente em cada area (pastejada e nao pastejada), adicionando a cada uma duas bait-lamina, uma disposta horizontalmente na superficie do solo, e outra verticalmente dentro do solo. Para cada data amostral (9, 16, 22, 29 e 65 dias de exposicao) foram sorteadas 20 u.a. para analise. Foi observado grande consumo desde o inicio da exposicao, tanto na superficie quanto dentro do solo. A atividade da fauna diferiu com a profundidade do solo, sendo maior na superficie e na profundidade de 6,5-8 cm. Em relacao as diferentes tecnicas, ambas revelaram resultados similares quando se compararam as duas areas. A area pastejada demonstrou menor atividade dos invertebrados quando comparada a nao pastejada. Esses resultados constituem base para futuras pesquisas no Brasil, relatando que o teste de bait-lamina nos Campos Sulinos pode oferecer resultados otimizados apos cerca de uma quinzena de dias de exposicao. Evaluation of Soil Invertebrates Feeding Activity in South Brazilian Campos – Bait Lamina Test Abstract. The aim of this work is to inform about a pioneer bait-lamina test in the South Brazilian Campos to evaluate the soil invertebrates feeding activity which is an approaching to leaf litter decomposition rates in the ecosystems. The feeding activity was tested during two months, across 8 cm of soil depth and employing a comparison between two techniques of consumption quantification (conservative technique vs. practical technique) in two different grassland areas (grazed and not grazed) were described. One hundred independent sampling units (s.u.) were established on each area, and in each s.u. two bait-lamina were inserted: one horizontally and another vertically. For each sampling date (9, 16, 22, 29 e 65 days of exposition), 20 s.u. were sorted and analyzed. We observed a high feeding activity from the beginning of the experiments, both in the surface and within the soil. Soil fauna feeding activity differed according to soil depth, being higher on the surface and for 6.5-8 cm deep in the soil. Both techniques lead to similar results when the two areas were compared. The grazed site showed lower invertebrate feeding activity than the site not grazed. These findings constitute a basis for future researches in Brazil, relating that the bait-lamina test can offer useful results around fifteen days of exposition.

Avaliação da Atividade Alimentar dos Invertebrados de Solo em Campos do Sul do Brasil – Bait-Lamina Test