Effects of non-native earthworms on the University of Michigan Biological Station soils

Abstract

Soil is an ecosystem rich in nutrients, containing a wide variety of organisms all held within a delicate ecological balance. Earthworms a well-known detritivore, able to break down nutrients and facilitate nutrient flow throughout soil horizons. Having no earthworms native to Michigan, the purpose of this experiment was to better understand the complex interactions between earthworms and their environment, and their potential impact on native soils. Conducted on University of Michigan Biological Station (UMBS) property in the Northern Lower peninsula of Michigan, this experiment surveyed earthworm populations by replicating a procedure developed by the Great Lakes Worm Watch, as well as conducting a controlled study on earthworm facilitated nutrient flow. Results showed there to be a significant differences in worm population numbers at varying locations, as well as significant differences in soil nutrient levels when exposed to earthworms. These results could potentially inform upon soil dynamics as well as the ability of an invasive organism to have impacts on its new environment.