Consistent patterns of common species across tropical tree communities

Area of Science:

• Ecology
• Forest Science
• Biodiversity Research

Background:

• Tropical forests are Earth's most biodiverse ecosystems, yet understanding them is challenging due to the vast number of tree species.
• Limited knowledge exists for most tropical tree species, hindering our ability to predict their responses to environmental changes.
• Common tree species represent a potentially tractable focus for understanding tropical forest dynamics.

Purpose of the Study:

• To investigate the abundance patterns of common tree species across major tropical forest regions.
• To estimate the number of species that constitute a significant proportion of tropical trees globally.
• To explore the consistency of common species patterns and abundance distributions across continents.

Main Methods:

• Analysis of extensive inventory data from 1,003,805 trees (diameter ≥ 10 cm) across 1,568 locations in Africa, Amazonia, and Southeast Asia.
• Estimation of species proportions contributing to 50% of trees in regional and global tropical forests.
• Resampling analyses to assess the predictability of common species identification.

Main Results:

• Approximately 2.2-2.3% of species account for 50% of tropical trees in Africa, Amazonia, and Southeast Asia.
• An estimated 1,053 species comprise half of all ~800 billion tropical trees globally (diameter ≥ 10 cm).
• Consistent patterns of common species and abundance distributions were observed across continents, suggesting universal tree community assembly mechanisms.

Conclusions:

• A small number of common species dominate tropical forests, providing a focused approach for ecological research.
• The consistent patterns across regions indicate fundamental, broadly applicable mechanisms governing tropical tree communities.
• Identifying and studying these common species can facilitate targeted research on tropical forest responses to environmental change.