Responses of ground beetles (Coleoptera: Carabidae) to a severe wind disturbance event and subsequent fuel reduction treatments in northeastern Minnesota
Kamal JK. Gandhi, firstname.lastname@example.org, Daniel W. Gilmore, email@example.com, Steven A. Katovich2, William J. Mattson, firstname.lastname@example.org, John C. Zasada2, and Steven J. Seybold2. (1) University of Minnesota, Departments of Entomology and Forest Resources, Davis, CA, (2) USDA Forest Service, Forest Health Protection, St. Paul, MN
The July 4th 1999 catastrophic windstorm in the Superior National Forest of northeastern Minnesota presents a unique opportunity to explore the multiple effects of a severe wind-disturbance and post-wind-disturbance management activities on the successional trajectories of sub-boreal litter-dwelling beetles (Coleoptera: Carabidae). During the summers of 2000-2003, we sampled two forest cover types (Pinus banksiana and Populus tremuloides/Betula papyrifera/conifer) to compare carabid beetle diversity, trap catches, and species composition between forest areas that were undisturbed (control), severely wind-disturbed (> 67% tree mortality), wind-disturbed-salvage-logged, and wind-disturbed-prescribed-burned. Carabids were captured in 32 plots using 192 unbaited pitfall traps with six traps randomly distributed within each plot. During the summers of 2000-2001, we caught 4,671 adults representing 35 species. Results indicate that there were minor differences among species diversity, trap catches, and species composition of carabids in P. banksiana and P. tremuloides/B. papyrifera/conifer forests. However, higher diversity, greater trap catches, and more distinct species composition of carabids were observed in the salvage-logged and prescribed-burned stands of both forest types. In 2001, Pterostichus melanarius, a long-established exotic species from Europe, was trapped in highest numbers in the prescribed-burned areas suggesting that even in remote areas, recently burned areas may be colonized by exotic carabid species. Overall, our results indicate that post-wind-disturbance management activities have the potential to change the successional trajectories of carabid beetles relative to naturally disturbed areas.