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Latitudinal patterns in stabilizing density dependence of forest communities.

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Conspecific negative density dependence (CNDD) stabilizes plant communities, but this effect is not stronger in tropical forests. However, CNDD impacts rare species more in the tropics, potentially contributing to higher tropical tree diversity.

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Area of Science:

  • Ecology
  • Forest Science
  • Biodiversity Research

Background:

  • Conspecific negative density dependence (CNDD) reduces plant performance near same-species neighbors.
  • A prevailing hypothesis suggests CNDD is stronger in tropical forests, promoting species coexistence and diversity.
  • Previous studies on latitudinal CNDD gradients were limited by static data.

Purpose of the Study:

  • To comprehensively assess latitudinal patterns of CNDD using dynamic mortality data.
  • To investigate how CNDD varies with latitude and species abundance.
  • To understand the implications of CNDD for tropical forest diversity.

Main Methods:

  • Utilized dynamic mortality data from 23 forest sites globally.
  • Estimated species-site-specific CNDD.
  • Compared CNDD patterns across tropical and temperate latitudes.

Main Results:

  • Stabilizing CNDD was widespread but not stronger in the tropics on average.
  • Tropical rare and intermediate abundant species experienced stronger CNDD than common species.
  • This abundance-dependent CNDD pattern was absent in temperate forests.

Conclusions:

  • CNDD regulates species abundances more strongly in tropical forests, particularly for less common species.
  • While not stronger overall, CNDD's differential impact in the tropics may contribute to higher local tree diversity.
  • Further research is needed to fully evaluate CNDD's role in latitudinal diversity gradients.