Effects of elevation and slope on the alpha and beta diversity of ground-dwelling beetles in Mt. Jirisan National Park, South Korea

We examined the diversity of ground-dwelling (epigaeic) beetles at different elevations of the northern and southern slopes of Mt. Jirisan National Park, South Korea. We selected eight study sites from both slopes and collected the beetles 10 times from May 2018 to August 2019 using pitfall traps. We collected a total of 67 species and 12,304 individuals and found higher species richness and abundance among the beetles from the northern slope (54 species and 6,969 individuals) than the southern slope (46 species and 5,335 individuals). We observed that the proportion of species based on the biogeographic affinity (Palearctic or Oriental) did not depend on the elevation and slope. The species richness increased with elevation and the abundance showed hump-shaped with a peak at 800 m. While the overall beta diversity was similar at the mountain and slope levels, the underlying processes such as spatial turnover and nestedness differed at the mountain and slope levels, respectively. We found that the ground beetle assemblages depended on elevation and soil characteristics such as soil organic matter and pH but were unaffected by the vegetation type.