RESUMONeste trabalho são listadas as espécies de formigas de serrapilheira encontradas em quatro ambientes localizados na região noroeste do estado do Rio Grande do Sul, a fim de verificar o impacto da ação antrópica realizada no meio rural. Para a coleta das formigas da serrapilheira foi utilizado o método do extrator de Winkler. Foram coletados 6.300 espécimes pertencentes a oito subfamílias, 18 tribos, 31 gêneros e 108 espécies. A floresta nativa possui a maior riqueza observada com 90 espécies coletadas, seguida por eucalipto com 65 espécies, agricultura e pastagem exótica com 20 espécies cada. O índice de diversidade de Margalef foi de 11,21 para área com floresta nativa, 8,37 para eucalipto, 3,48 para agricultura e, 2,71 na área de pastagem exótica. O índice de diversidade de Shannon obtido foi de 2,89; 3,15; 2,43 e 1,98 e de equitabilidade 0,64; 0,75; 0,84 e 0,66 para as áreas com: floresta nativa, eucalipto, agricultura e pastagem, respectivamente. O maior valor do índice de diversidade para a área de eucalipto pode ser devido à área possuir 28 anos de implantação, sem ter sido manejada, com sub-bosque de espécies nativas, formando um dossel contínuo e espessa camada de serrapilheira, já a floresta nativa por sofrer intervenções antrópicas, possui um valor de diversidade de Shannon menor comparado à área com eucalipto. Palavras-chave: riqueza; bioindicador; extrator mini-Winkler. ABSTRACTLitter ant species found in four sites located in northwestern Rio Grande do Sul state were listed in this study to verify the impact of human activities conducted in rural areas. The method used for the collection of litter ants was the Winkler extractor. There were collected 6,300 specimens belonging to eight subfamilies, 18 tribes, 31 genera and 108 species. Native forest presented the highest richness observed with 90 species collected, followed by 65 eucalyptus species, and agriculture and pasture with 20 exotic species each. Margalef's diversity index was 11.21 for area with native forest, 8.37 for eucalypt, 3.48 for agriculture, and 2.71 in exotic pasture area. The Shannon's diversity indices obtained were 2.89, 3.15, 2.43 and 1.98 and equitability indices of 0.64, 0.75, 0.84 and 0.66 for areas with native forest, eucalyptus, agriculture and 1 Engenheiro Florestal, Dr., Professor

The objective of this study is to evaluate the damage caused by Acromyrmex heyeri Forel, 1899 and Acromyrmex lobicornis Emery, 1887 to Pinus taeda L. seedlings during the first two months after replanting. The experiment was conducted in the company Bosques del Plata, located in the province of Corrientes, Argentina. The evaluations were carried out at seven, 14, 21, 36, 50 and 65 days after replanting the seedlings, when the number of dead, alive, non-attacked, alive deneedled, and alive deneedled with cuts/damage to the apical bud by leaf-cutting ants was quantified. The results allow us to conclude that A. heyeri and A. lobicornis are responsible for losses to the order of 20.8% of the seedlings in an initial P. taeda stand at 65 days. The damage caused to seedlings by the two leaf-cutting ant species is constant over time, in which A. lobicornis is more voracious than A. heyeri.

RESUMOO presente trabalho objetivou registrar a ocorrência de novas espécies de formigas para o estado do Rio Grande do Sul e, com isso, contribuir para o conhecimento sobre a mirmecofauna. As coletas foram realizadas em quatro ambientes (floresta nativa, plantio de eucalipto, plantio agrícola e pastagem exótica). Para a coleta das formigas, foi utilizado o método do extrator de mini-Winkler, cujo processo consistiu em retirar 1m² de serapilheira, peneirá-la e acondicioná-la em extratores de mini-Winkler para a obtenção da fauna. Foram coletadas 108 espécies, representantes de 31 gêneros, 18 tribos e oito subfamílias. Destas, a floresta nativa, apresentou 90 espécies coletadas, seguida pelo plantio de eucalipto, com 65 espécies, pelo plantio agrícola e pela pastagem exótica, com 20 espécies cada. ABSTRACTThis study aimed to report the registration of new ant species in Rio Grande do Sul state and thus to contribute to the knowledge about the ant fauna (Myrmecofauna). Collections were made in four different environments, namely, native forest, eucalyptus plantations, agricultural plantation and exotic pasture. We used the mini-Winkler method of extraction to collect the ants. We removed 1 square meter (1m²) of litter, sifted it and packed it in mini-Winkler extractors to obtain the fauna. We collected 108 species, which represent 31 genera, 18 tribes and 8 subfamilies. The native forest presented 90 collected species, the eucalyptus plantation presented 65 species, and the agricultural plantation and the exotic pasture presented 20 species each. We have registered for the first time the following species in the state of Rio Grande do Sul:

This work aimed to characterize the composition of the soil macrofauna in non-mined and mined areas recovered with native vegetation, Eucalyptus dunnii Maiden and Acacia mearnsii De Wild. plantations, in a coal mine. Five areas were evaluated, namely, three non-mined areas and two mined and recovered areas. Six soil samples per area were collected using a 10x10 cm circular probe, every month during one year. Defragmentation of the soil and removal of specimens was carried out in a laboratory. A total of 3,195 specimens from 11 taxa were collected. The most abundant groups were Hymenoptera, Isoptera and Coleoptera. There were significant correlations (p<0.05) between the total abundance of Isoptera and Coleoptera with some meteorological variables. The recovery process of the mined areas with black-wattle and eucalyptus plantations proved to be efficient because there was similarity of macrofauna groups between the non-mined, mined and native vegetation areas.

Termos para indexação: Entomologia florestal Mudas TripesResumo -This study aimed to register the occurrence of phyllophagous insects attacking seedlings of Apuleia leiocarpa (Vogel) J. F. Macbr. (grapia), a native species to Brazil, which is on the red list of endangered native flora in Rio Grande do Sul State. In February 2012, adults of the pest Caliothrips phaseoli were identified causing damage to the leaves of 168 two-year-old grápia seedlings (mean stem diameter = 2.3 cm; mean height = 22.5 cm) in Santa Maria, RS. This is the first record of the occurrence of Caliothrips phaseoli in Apuleia leiocarpa seedlings in Brazil.