Abstract
Old World Bluestems (OWB), introduced from Europe and Asia in the 1920s, recently have begun to raise concerns in the Great Plains. Despite suggestion in the late 1950s that OWB were weedy and negatively impacted biological diversity, they were widely introduced throughout the Great Plains for agricultural purposes. Anecdotal evidence suggests that OWB exhibit invasive characteristics that promote competitive exclusion of native species. The objective of our study was to quantify the competitive abilities of two OWB species (Caucasian bluestem; Bothriochloa bladhii (Retz.) S.T. Blake (= Bothriochloa caucasica (Trin.) C.E. Hubb.) and yellow bluestem; Bothriochloa ischaemum (L.) Keng) with three native grass species (big bluestem (Andropogon gerardii Vitman), little bluestem (Schizachyrium scoparium (Michx.) Nash), and sideoats grama (Bouteloua curtipendula (Michx.) Torr.)). A greenhouse target-neighbor study was conducted to assess both interspecific and intraspecific competition. A total of 480 pots (4.4 l) filled with native soil was used with all pair-wise combinations of species and four density treatments (six replications). Vegetative tiller height, above- and belowground biomass were measured at the end of 16 weeks. Both of the OWB significantly inhibited at least one growth parameter of the three native grass species, while most of the native species did not inhibit growth of either OWB species. Growth of B. ischaemum was enhanced when grown in association with S. scoparium. Based upon the results of our study of OWB competitive superiority and previous research, many of the characteristics possessed by OWB are found to be in common with known invasive species. Hence, we propose that two OWB are competitively superior to three common native prairie species providing them with the ability to invade and threaten the native grasslands of the Central and Southern Great Plains.
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Acknowledgments
We would like to thank USDA-NRCS Plant Material Center, Manhattan, Rich Wynia, Sharp Brothers Seed Company, and Johnston Seed Company for donation of native and non-native seeds. Comanche Pool Prairie Resource Foundation for funding. FHSU Grounds Department and Department of Biological Sciences for delivery, and removal of soil, and use of the greenhouse. Thank you to the greenhouse crew; Rachel Copeland-Knight, Amy Hladek, Regina Green, Mindy Scheck, John Moyer, David Bender, Matt Withroder, and David, Linda, and Marla Schmidt. Authors also wish to thank Gail Wilson, OSU Natural Resource Ecology and Management Department for her detailed review of the manuscript, and two anonymous reviewers for their insightful comments.
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Schmidt, C.D., Hickman, K.R., Channell, R. et al. Competitive abilities of native grasses and non-native (Bothriochloa spp.) grasses. Plant Ecol 197, 69–80 (2008). https://doi.org/10.1007/s11258-007-9361-2
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DOI: https://doi.org/10.1007/s11258-007-9361-2