Abstract. The advancement of agricultural frontiers and pastures has contributed to the fragmentation of the forest, and these fragments are affected by disturbances of varying degrees of intensity that influence the local fauna and flora. The objective of this work was to analyze how do the magnitude and extent of edge effects and seasonality chance to richness and abundance of beetle. The experiment was conducted in an area containing forest, border and pasture belonging to the Federal Institute of Sergipe. A total of 1,173 specimens from 16 species were collected. The border areas showed a greater richness and abundance of species characterized by being an area of intermediate disturbance, while the anthropic area (pasture) presented the lowest abundance and abundance of Coleoptera and a greater variety of pest beetles, suggesting that the occurrence of some species of pest beetles may be an indication of degraded areas. The abundance and richness of the coleoptera community decreased in the rainy season. Small distances between the pasture, the edge of the forest fragment and the interior of this fragment seem to be crucial to determine the structure of the beetle community, reinforcing attention to the conservation of habitats for its development.Keywords: Abundance; Forest fragment; Ecological microscale; Pasture; Richness. Efeitos de borda sobre assembleias de besouros em fragmento de Mata Atlântica e pastagem em Sergipe, BrasilResumo. O avanço das fronteiras agrícolas e das pastagens contribuiu para a fragmentação da mata, e estes fragmentos são afetados por distúrbios de diferentes graus de intensidade que influenciam a fauna e a flora local. O objetivo deste trabalho foi analisar como a magnitude e extensão do efeito de borda e a sazonalidade influencia na riqueza e abundância de besouros. O experimento foi conduzido em uma área contendo mata, borda e pastagem pertencente ao Instituto Federal de Sergipe. Foram coletados 1.173 espécimes pertencentes a 16 espécies. As áreas de borda se destacaram apresentando maior riqueza e abundância de espécies caracterizada por ser uma área de distúrbio intermediário, enquanto que a área antropizada (pastagem) apresentou a menor riqueza e abundância de Coleópteros e maior variedade de besouros pragas, sugerindo que a ocorrência de algumas espécies de besouros-praga pode ser uma indicação de áreas degradadas. A abundância e riqueza da comunidade de coleópteros diminuíram na estação chuvosa. Pequenas distâncias entre o pasto, a borda do fragmento florestal e o interior deste fragmento parecem ser cruciais para determinar a estrutura da comunidade de besouros, reforçando a atenção à conservação de habitats para seu desenvolvimento.
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