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Seed arrival in tropical forest tree fall gaps.

Carolina Puerta-Pińero1, Helene C Muller-Landau, Osvaldo Calderón

  • 1Smithsonian Tropical Research Institute, Apartado Postal 0843-03092, Panamá, República de Panamá. cpuertapinero@gmail.com

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Summary

Forest gaps receive fewer seeds than the understory, with significant reductions in animal-dispersed seeds. This altered seed arrival impacts forest regeneration dynamics.

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Area of Science:

  • Ecology
  • Botany
  • Forest Science

Background:

  • Treefall gaps are crucial for forest regeneration, influencing light availability and promoting seed germination.
  • While seedling performance in gaps is studied, seed arrival patterns into gaps versus the understory remain less understood.
  • Seed dispersal mechanisms (wind, animal, explosive) are expected to be affected by gap environments.

Purpose of the Study:

  • To compare seed arrival quantity and functional composition in forest gaps versus understory sites.
  • To investigate how different seed dispersal syndromes influence seed arrival in newly formed gaps.
  • To understand the implications of altered seed arrival for forest plant community regeneration.

Main Methods:

  • Documented seed arrival for seven years post-gap formation in Barro Colorado Island (BCI), Panama.
  • Quantified total seed arrival and categorized seeds by dispersal syndrome (wind, animal, explosive).
  • Compared seed arrival rates and composition between gap and understory sites.

Main Results:

  • Gaps received 72% fewer seeds than understory sites in the first three years.
  • Animal-dispersed seeds showed an 86% reduction in gaps, while wind-dispersed seeds decreased by 47%.
  • Explosively dispersed seeds increased in gaps, primarily from surviving or newly recruited shrubs; lianas also arrived relatively better.

Conclusions:

  • Seed arrival into forest gaps differs significantly in quantity and functional composition from the understory.
  • Differential seed arrival patterns, favoring wind and explosive dispersal, can influence the species composition of regenerating gap communities.
  • Understanding seed arrival dynamics is key to predicting forest resilience and managing tropical forest regeneration.