Trait choice profoundly affected the ecological conclusions drawn from functional diversity measures

Area of Science:

• Ecology
• Trait-based ecology
• Biodiversity research

Background:

• Quantifying functional diversity is essential for understanding ecosystem function.
• Trait selection methods are crucial but rarely compared, leading to potential biases.
• The impact of trait choice on ecological conclusions remains largely unexplored.

Purpose of the Study:

• To compare quantitative trait selection methods for functional diversity.
• To evaluate how different trait selection strategies affect ecological conclusions.
• To assess the performance of trait selection methods against an ordination axis-based approach.

Main Methods:

• Presented four alternative trait selection methods.
• Compared associations between species richness and functional diversity indices (FAD, FD, Q, FDis).
• Benchmarked against a complete search method using all trait combinations across six ecosystems.

Main Results:

• Trait selection methods offer potential alternatives to the axis-based approach for mechanistic understanding.
• Both selection and axis-based methods can use mismatched information, potentially misinterpreting ecosystem properties.
• Trait choice profoundly influences ecological conclusions derived from functional diversity measures.

Conclusions:

• Trait selection methods are viable alternatives but require careful validation.
• The complete search method is vital for assessing the rationale and quality of chosen traits and indices.
• Ecological conclusions are highly sensitive to the trait selection process.