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Updated: Jan 25, 2026

Reliable Method for Assessing Seed Germination, Dormancy, and Mortality under Field Conditions
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Germination speed modulates priority effects: Evidence from a large-scale field study.

Tamara L H van Steijn1, Paul Kardol2,3, Roland Jansson1

  • 1Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden.

Ecology
|January 23, 2026
PubMed
Summary
This summary is machine-generated.

Germination timing, not just seed arrival, significantly impacts plant interactions and community structure. Fast-germinating species are less affected by arrival order, while slow-germinating species benefit from early emergence.

Keywords:
borealgermination speedphenologyplant community assemblyplant competitionpriority effectsseed densitytemperate

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Area of Science:

  • Ecology
  • Plant Community Dynamics
  • Ecological Succession

Background:

  • Priority effects, where early species influence later ones, are typically studied based on seed arrival.
  • Seedling emergence timing, which dictates the start of plant interactions, may be more crucial than seed arrival time.
  • Initial seed density could potentially mitigate disadvantages for both early and late-arriving species.

Purpose of the Study:

  • To investigate the role of seedling emergence timing versus seed arrival time in priority effects.
  • To assess the influence of initial seed density on priority effect outcomes.
  • To examine how environmental context (climatic differences) modulates priority effects.

Main Methods:

  • A large-scale, multi-site field experiment was conducted across two climatically contrasting Swedish sites.
  • Meadow species with varying germination speeds (fast vs. slow) were sown in different arrival orders and densities.
  • Species arrival and emergence timing were manipulated to study their effects on plant interactions.

Main Results:

  • Germination speed was found to modulate the strength and direction of priority effects.
  • Fast-germinating species showed less sensitivity to arrival order, while slow-germinating species were negatively impacted by late arrival and positively by early arrival.
  • Initial sowing density had minor and inconsistent effects on priority effect outcomes, contrary to expectations.
  • Priority effects varied significantly between the two sites, indicating context dependency.

Conclusions:

  • Seedling emergence timing is a critical factor in plant priority effects, influencing competition and community structure.
  • Environmental conditions, such as site productivity and growing season length, play a key role in modulating priority effects.
  • Understanding emergence timing and environmental context is vital for predicting vegetation dynamics, especially under climate change scenarios.