Conservation and ecology of the narrow-range endemic beetle genus Tropidotrechus (Carabidae: Trechini)

Context. Narrow range endemic species (NREs) are a restricted species that usually lack effective long-distance dispersal powers. Invertebrate species make up a large percentage of NRE species. They are at increased risk of extinction due to threats of climate change. Increased conservation efforts for these species are required. Aim. To develop a species distribution model for the beetle Tropidotrechus victoriae (Carabidae: Trechinae) and to assess the potential effects of climate change on this NRE species. Methods. A species distribution model (Maxent) was used to assess the potential distribution of T. victoriae based on intensive sampling across the range of the species. Leaf litter and other environmental data was collected at sample sites. Future climate models were used for analysis of potential effects of climate change on T. victoriae viable habitat areas. Results. Tropidotrechus victoriae are at a high risk of extinction because increased temperatures and lower precipitations marked reduce the area of potential habitat. Other environmental and leaf litter characteristics appear to have limited impact on whether T. victoriae is found at a site, except elevation which determine temperature and precipitation. The composition of the beetle assemblages at sample sites have no impact on whether T. victoriae is present.<p></p>