Spatial distribution and seasonality of Heliocharis amazona Selys in acerrado area of Sao Paulo State, Brazil (Zygoptera: Dicteriadidae)

摘要

The study was conducted on 2 nature reserves in NE Sao Paulo State, SE Brazil H. amazona populations naturally occur in low densities. 25 male, 2 female and 23 larvae were recorded, only at streams with riparian vegetation. All larvae were collected during the dry season and adults only during the wet season. The highest number of larvae was collected in pools having litter as substrate, but they were also found in slow and moderate velocity water. Due to their patched distribution, H. amazona may face high risk of local extinction and such a possibility should be taken into account in the management of both studied nature reserves.