Invasibility of a nutrient-poor pasture through resident and non-resident herbs is controlled by litter, gap size and propagule pressure.

PLoS One · 2012 · PMC3404001 · PMID 22911863

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highly significantno p-value reported

Secondly, species specific effects were highly significant and consistent, whereas variation among species within each status group was large.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.