Black rats were trapped in four sites within Hawaii Volcanoes National Park from 2015-2017.  Plots were paired, with one pair at lower elevation and the other at higher elevation.Trapping sessions consisted of 4 consecutive days of  trapping, and there 2 sessions during each fall and spring (8 sessions  total). The Hagaruma basket traps were first pre-baited with shredded coconut for 2-3 days before being set and baited with coconut chunks. 

We present the results of  trapping illustrated by overall trap catches of unique rats. We also provide a summary of demographic parameters for the populations including adult body weight, longevity, and male to female ratio. We present these as spatial (elevation) and temporal (seasonal) trends.

• Rats were captured in all available vegetation classes.
• Broad vegetation classes do not explain the distribution of hotspots.
• A fine scale approach detailing vegetation at each trap location, as well as coarse woody debris and substrate type might help to better explain distribution of hot spots.
• If there are relationships that could be predictive of rat density, it would help managers prioritize areas for rat control, determine appropriate spacing between traps, and target high-density areas.