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Competition between native perennial and exotic annual grasses: implications for an historical invasion



Competition between native perennial and exotic annual grasses: implications for an historical invasion



Ecology 85(5): 1273-1283



Competitive interactions between native and exotic grasses in a coastal prairie grassland ecosystem in northern California were examined. Established populations of invasive species can have substantial competitive effects on native populations; however, exotic propagules may require disturbances that reduce competitive interference by resident species in order to become established. The relative competitiveness of native perennial and exotic annual grasses were compared. At first, native grasses were suppressed by exotic annual grasses, but in subsequent years native perennial grasses were the superior competitors. If interactions between native perennial and exotic annual grasses exhibit a similar pattern in other coastal grassland habitats, then introducting exotic grass propagules alone without changes in land use, or climate, or both, was probably insufficient to convert the coastal California grasslands from native perennial-dominated to exotic annual-dominated grasslands.

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Accession: 009799842

Download citation: RISBibTeXText

DOI: 10.1890/02-0744


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