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.