The research deals with species richness of the moth family Geometridae in two different study sites: open riverine vegetation and primary forest vegetation (lowland rainforest, Wanang Conservation Area, Madang, Papua New Guinea). The light trapping method was used and the reference collection for morphotype assignment was completed.

There was a difference in the number of individuals and species richness of Geometrid moths between the riverine forest and primary forest. The lower quantity and biodiversity in the riverine forest was significant. It was most likely caused by the disturbance of the forest and the resulting lower number of host plants. However, a more complex follow-up research is needed for a detailed evaluation of other impact factors that may be contributing to the diminished biodiversity in the area.

The research was carried out during a month long student project in co-operation with Binatang Research Centre in Papua New Guinea.