Effects of Increased Heteropogon contortus (Tanglehead) on Rangelands: The Tangled Issue of Native Invasive Species

Authors

Brian J Bielfelt, Andrea R Litt

Publication

Rangeland Ecology & Management

Abstract

Heteropogon contortus recently and rapidly increased in dominance in grasslands where it once had been a minor component. Ecological effects of this increase are unknown, but land managers are concerned about the potential negative economic and ecological impacts. We examined compositional and structural characteristics of the vegetation community along a gradient of dominance of H. contortus to quantify changes, compare the effects to invasions by nonnative grasses, and provide insights about management. As H. contortus increased, grass richness decreased across the gradient by 6 species ? m? 2 (95% CI: 2 ? 10) in summer and 10 species ? m? 2 (6 ? 15) in winter. Cover of other native grasses decreased 8 ? 10% in both seasons for every 10% increase in H. contortus. Presence of seven individual plant species and cover of five species decreased, but presence of five species and cover of one species increased with H. contortus. Canopy cover increased and soil nutrients were higher in dense H. contortus, potentially facilitating further ecological changes. We suggest that managing H. contortus and other species that become invasive within the ecosystem where they were once native likely requires reducing rather than wholly eliminating the species, which may differ from management strategies for nonnative species.

Links

 

How is this information collected?

This collection of Montana State authored publications is collected by the Library to highlight the achievements of Montana State researchers and more fully understand the research output of the University. They use a number of resources to pull together as complete a list as possible and understand that there may be publications that are missed. If you note the omission of a current publication or want to know more about the collection and display of this information email Leila Sterman.