Effects of environmental characteristics on overall silphid beetle and <i>N</i>. <i>investigator</i> abundance.

<p>Relationship between total abundance of trapped silphid beetles per plot and <b>a</b> mean ambient temperature and <b>b</b> fine sand content. Relationship between total abundance of trapped <i>N</i>. <i>investigator</i> per plot and <b>c</b> region and <b>d</b> bulk density. <b>a</b> & <b>b</b>: observed values (circles) and predicted values (connected by a line) for the negative binomial-GLMM model (deviance = 10.39, P = 0.006), <b>c</b>: box plot showing the median, the 75% percentile, the 25% percentile, the highest non-extreme value, the smallest non-extreme value, and the extreme values inside a category (negative-binomial GLMM model comparison, deviance = 49.19, P < 0.001; Tukey tests, ***P < 0.001), <b>d</b>: observed values (circles) and predicted values (connected by a line) for the negative-binomial GLMM model (deviance = 56.44, P < 0.001).