#8207. The pioneer effect advantage in plant invasions: site priming of native grasslands by invasive grasses

October 2026publication date
Proposal available till 08-06-2025
4 total number of authors per manuscript0 $

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Journal’s subject area:
Ecology, Evolution, Behavior and Systematics;
Ecology;
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Abstract:
Evaluating the mechanisms that drive plant invasions in grassland ecosystems can provide insight into subtle, yet critical, drivers of ecosystem function. Common hypotheses for invader success are that (1) an invader’s physiology may allow better use of resources and competitively exclude resident natives; (2) the lack of invader-specific herbivores and diseases may result in increased growth and competitive advantage over natives; (3) invaders may bring pathogens or herbivores that negatively impact native plants directly; (4) the invader may be able to establish earlier or later than natives, giving it a priority effect or phenological niche separation; (5) the invader may produce more seeds, and propagule pressure may allow it to eventually dominate; and (6) once the invader occurs on a site, its plant detritus or litter can offer a legacy effect advantage. Yet, a widely neglected aspect of invasion is that invaders may prime the conditions in places other than where they are currently established, giving them a pioneer effect advantage.
Keywords:
competitive exclusion; legacy effect; priority effect; seedling dynamics

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