Competitive relationships ofAndropogon gerardii(Big Bluestem) from remnant and restored native populations and select cultivated varieties

Authors:
Publisher website
Google Scholar
Abstract
Summary: Although genetic differentiation among plant populations is well known, its relevance for preserving the integrity of native ecosystems has received little attention. In a series of competition experiments withAndropogon gerardiiVitman, a dominant species of the North American Tallgrass Prairie, plant performance was related to seed provenance and restoration activities. Glasshouse experiments showed plant performance to be a function of seed source. Differential target plant performance relative to competitor identity was observed when plant performance was assessed across a range of competitor densities. Local and non‐local plants were larger when competing against non‐local plants relative to the local and cultivar plants, while cultivar plants were consistently larger than local and non‐local plants regardless of competitor identity or density. The consistency of cultivar performance could reflect directional selection during cultivar development for consistently high fecundity, vigorous vegetative growth and resistance to pathogens. In a field experiment, non‐local plants were half the size of local and cultivar plants, supporting recognition of seed provenances ofA. gerardiibased on differences in plant performance among source populations observed in the glasshouse study, and previous genetic analyses of the same populations. This study establishes that seed provenance and restoration activities influence the competitive ability of a dominant species which, in turn, may affect plant community structure and potential ecosystem function.

This publication has 42 references indexed in Scilit: