Dinâmica espacial dos atropelamentos da Arunofauna em estradas secundárias de Tefé-AM

Abstract

Road kill is the most visible impact of a highway on wildlife. An important approach to mitigate the impact of being run over on highways is to locate the points where they are concentrated. Therefore, the objective of the present study was to analyze the spatial dynamics of pedestrian accidents in the anurofauna on the roads of Agrovila and EMADE, in the municipality of Tefé, Amazonas. More specifically, check the rate of trampling of frogs in two years of monitoring; the existence of hit-and-run aggregation points for the most hit species; the existence of hit-and-run hotspots on the two sampled roads; and check if there is a difference in the location of the hit-and-run hotspots between the two years of monitoring. Data were collected between August 2017 and August 2019 on the roads of Agrovila and EMADE. Each animal run over had its geographic coordinate recorded. Two-dimensional K-Ripley analysis, two-dimensional hotspot analysis and the hit-and-run rate were calculated. 1,302 run over individuals were recorded, divided into seven families and 20 species. Four species represented a total of 72% of all records (Rhinella marina, Rhinella major, Leptodactylus macrosternum and Boana lanciformis). The daily hit-and-run rate for the Agrovila road was 0.77 individuals per kilometer (ind / km * day) and for EMADE it was 0.60 ind / km * day. Two main sections of hotspots were identified for the group of frogs on the road from Agrovila, located between km 0 and 3, and from 5 to 7. On the EMADE road, a section of main hotspots was identified, located between km 0 to 1 As for the location of the hotspots for the four most abundant species on the Agrovila road, it was observed that there is no overlap between these species, but there is an overlap of the hotspots between two years in the same species. On the EMADE road, there is an overlap of the hotspots of two species (R. major and L. macrosternum). We observed a correlation in the distribution of anuran hotspots only on the road to Agrovila. The results presented here must be considered in the monitoring of run over animals and in the planning of mitigating measures.