Competition, cannibalism and intraguild predation among ground beetles (Coleoptera: Carabidae): A laboratory study

We used laboratory experiments to study the potential for predator-prey and competitive interactions between two carabid beetles, the holarctic Pterostichus adstrictus (Eschscholtz), and P. melanarius (Illiger) introduced to North America from Europe. These two species co-occur over much of northern North America and exhibit changing patterns of between-habitat distribution and abundance in western Canada. In our experiments, adult survival of …