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Area of Science:

  • Ecology
  • Population Dynamics
  • Forest Ecology

Background:

  • Resource pulses, like mast seeding, are infrequent, high-magnitude events crucial for ecosystem dynamics.
  • Mast seeding, the synchronous production of seeds by perennial plants, is widespread but its continental-scale synchrony is poorly understood.
  • Previous studies on mast seeding synchrony were limited to local scales, leaving continental patterns unexamined.

Purpose of the Study:

  • To investigate the spatial synchrony of mast seeding events across continental distances.
  • To determine if mast seeding patterns break down into asynchrony at larger scales.
  • To explore the role of climate, specifically summer temperature, in driving mast seeding synchrony.

Main Methods:

  • Analyzed mast seeding synchrony for a transcontinental North American tree species over distances exceeding 5,200 km.
  • Utilized statistical methods to detect significant asynchrony in mast seeding patterns across large spatial scales.
  • Correlated mast seeding synchrony with spatiotemporal variations in continental summer temperature anomalies.

Main Results:

  • Mast seeding patterns exhibited significant asynchrony at distances greater than 2,000 km, challenging previous assumptions of continental synchrony.
  • Demonstrated a breakdown in mast seeding synchrony across space, a phenomenon not previously documented.
  • Identified spatiotemporal variation in continental summer temperatures as a key driver of mast seeding synchrony patterns.

Conclusions:

  • Mast seeding synchrony is not maintained at continental scales, with significant asynchrony observed over large distances.
  • Continental temperature variations play a critical role in shaping mast seeding synchrony and asynchrony.
  • The spatial dynamics of seed-consumer communities, including insects, mammals, and migratory birds, are likely affected by this large-scale asynchrony.