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BackgroundThe temporal dynamics of insect populations in tropical environments is highly complex and poorly known. Long-term seasonality studies are scarce, and particularly so for ichneumonid wasps (  HymenopteraIchneumonidae  ). This study represents an effort to elucidate aspects of seasonality and forest succession in the Brazilian Atlantic Forest.New informationWe report on the seasonal and successional dominance of the ichneumonid wasp    Trihapsis   polita    (  Cryptinae  ). A long-term survey of   Cryptinae   was carried out in a protected area of Brazilian Atlantic Forest, in primary, tall secondary and low secondary forest areas. Specimens were collected during rainy season (RS) and dry season (DS) between 2000 and 2008, with total sampling effort of 4,095 trap-days. A total of 8,385 specimens of   Cryptinae   were collected, of which 6,655 (79.4%) belonged to    T.   polita   . The occurrence of    T.   polita    species was heavily concentrated in the RS, with abundance 148× higher than during the DS. Seasonal fluctuation was also detected for   Cryptinae   as a whole, but was two orders of magnitude lower. Sampling efficiency also varied widely among areas, with the peak of abundance at the tall secondary forest. The dominance of    T.   polita    in secondary vegetation might be of general interest, as this type of forest is currently on the rise, due to unprecedented levels of human pressure.

Long-term seasonal dominance of the wasp Trihapsis polita Townes ( Hymenoptera , Ichneumonidae ) in the Brazilian Atlantic Forest