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Macroevolutionary consequences of mast seeding.

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Masting, or synchronized seed production, shows unimodal correlations with speciation rates in plants. However, this phenomenon appears to have limited macroevolutionary consequences beyond the species level.

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Area of Science:

  • Ecology and evolutionary biology
  • Plant reproductive strategies
  • Macroevolution

Background:

  • Masting, characterized by synchronized, intermittent seeding, is widespread in plants.
  • While beneficial for plant fitness, its macroevolutionary impacts, such as speciation, remain unclear.

Purpose of the Study:

  • To investigate the macroevolutionary consequences of masting in vascular plants.
  • To determine if masting influences speciation rates and trait evolution across plant clades.

Main Methods:

  • Utilized the largest dataset of population-level reproductive time series.
  • Combined data with a time-calibrated phylogenetic tree of vascular plants.
  • Analyzed the covariation between reproductive output variation and evolutionary history.

Main Results:

  • The coefficient of variation (CV) of reproductive output covaried with evolutionary history within clades.
  • Speciation rates exhibited unimodal correlations with intermediate CV and regional synchrony (S) of seed production.
  • No monotonic correlations were found between CV or S and speciation or seed size evolution rates.

Conclusions:

  • Masting may have limited macroevolutionary consequences, primarily impacting speciation at the species level.
  • The study provides insights into the evolutionary ecology of plant reproductive strategies.
  • Results suggest masting's influence on evolution is more nuanced than previously assumed.