Papers by Douglas A. Landis

	A comparison of biotic and abiotic factors in the presence and absence of glossy buckthorn in prairie fen
	Density dependence in natural plant populations: The role of demographic variance across gradients of population density
	Factors affecting the distribution of non-indigenous plants: The role of time, habitat availability, and biological traits
	Landscape diversity enhances the biological control of an introduced crop pest in the north-central U.S