Beyond the fast-slow continuum: demographic dimensions structuring a tropical tree community.

Area of Science:

• Ecology
• Evolutionary Biology
• Plant Science

Background:

• Life-history theory highlights demographic trade-offs limiting viable strategies.
• The growth-survival trade-off is well-established in tropical trees, but reproduction links are less understood.
• Understanding these trade-offs is crucial for tropical forest ecology.

Purpose of the Study:

• To analyze demographic rates from seed to adult in tropical trees and shrubs.
• To investigate the co-variation of growth, survival, and reproduction across ontogeny.
• To identify major dimensions of demographic variation and their relation to plant traits.

Main Methods:

• Analysis of demographic data for 282 co-occurring tropical tree and shrub species.
• Inclusion of reproduction measures and consideration of ontogeny in the analysis.
• Statistical examination of demographic rates across the full life cycle.

Main Results:

• Confirmed the established fast-slow continuum (growth-survival trade-off).
• Identified a novel 'stature-recruitment' axis: a trade-off between early-stage performance and later-stage growth/survival.
• Found strong alignment between demographic axes and trait dimensions (shade tolerance, size).

Conclusions:

• Tropical tree life-history strategies are structured by multiple, independent demographic trade-offs.
• The identified demographic dimensions and their trait correlations provide a framework for understanding community assembly.
• These findings contribute to a global understanding of plant life-history variation and ecological community structure.