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Belowground growth strategies of native and invasive rhizomatous perennial grasses in response to precipitation variability, clipping, and competition

Invasive clonal species may exhibit different growth strategies than their native clonal competitors. In this study, we examined the spatial distribution of tiller outgrowth and the bud bank by comparing the investment in phalanx versus guerilla growth of a native and invasive perennial grass in Nor...

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Published in:Folia geobotanica 2024-04, Vol.58 (3-4), p.245-257
Main Authors: Bam, Surendra, Ott, Jacqueline P., Butler, Jack L., Xu, Lan
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description Invasive clonal species may exhibit different growth strategies than their native clonal competitors. In this study, we examined the spatial distribution of tiller outgrowth and the bud bank by comparing the investment in phalanx versus guerilla growth of a native and invasive perennial grass in North America. We also examined the effect of altered precipitation frequency, clipping, and competition on their clonal growth strategies. Investment in phalanx and guerilla growth was assessed by examining live propagule and tiller production from the plant crown versus its rhizomes. Although invasive Bromus inermis and native Pascopyrum smithii exhibited similar clonal growth strategies as young seedlings, their clonal growth strategies significantly differed by the end of their first growing season. Pascopyrum smithii invested in dual phalanx and guerilla tiller outgrowth and bud placement, and B. inermis primarily invested in phalanx tiller outgrowth and bud placement. Competition rather than intra-annual precipitation variability and clipping altered the clonal growth strategy of these species. Intra- and inter- specific competition did not alter tiller outgrowth for either species. However, inter-specific competition caused both species to alter their bud placement. Bromus inermis shifted more buds from phalanx to guerilla positions while P. smithii shifted in the opposite direction. This may enable invasive B. inermis to expand while confining native P. smithii to more localized areas in the future. Clonal growth strategies appear to be species specific and responsive to inter-specific competition. Investigating the belowground bud aspect of clonal growth can reveal the mechanism driving the future aboveground clonal growth strategy of native and invasive rhizomatous grasses and help inform the patterns of invasion within a plant community.
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subjects Annual precipitation
Aquatic plants
Biomedical and Life Sciences
Bromus inermis
Competition
Grasses
Growing season
Invasive species
Life Sciences
Pascopyrum smithii
Placement
Plant communities
Plant Ecology
Plant Sciences
Plant Systematics/Taxonomy/Biogeography
Precipitation
Rhizomes
Seedlings
Spatial distribution
Strategy
title Belowground growth strategies of native and invasive rhizomatous perennial grasses in response to precipitation variability, clipping, and competition
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