Constancy in Functional Space across a Species Richness Anomaly.

Area of Science:

• Ecology
• Biodiversity Science
• Evolutionary Biology

Background:

• Understanding biodiversity drivers requires linking species richness and functional diversity.
• Latitudinal studies are confounded by climate and phylogeny.
• Species richness anomalies offer an alternative research approach.

Purpose of the Study:

• To investigate functional richness patterns across a tree species richness anomaly between Europe and eastern North America.
• To test hypotheses regarding interspecific interactions and climatic constraints on functional volume.
• To explore the role of unique and shared genera in functional diversity.

Main Methods:

• Comparative analysis of functional richness across Europe and eastern North America.
• Examination of species richness gradients and associated functional trait data.
• Assessment of genus uniqueness and contribution to functional diversity.

Main Results:

• Functional richness and trait space packing saturate at similar species richness levels on both continents.
• The species richness anomaly is driven by endemic North American genera.
• Endemic genera contribute less functional richness than expected, indicating redundancy.

Conclusions:

• Biodiversity patterns are shaped by diversification within climatically constrained trait spaces.
• Species richness anomalies are valuable tools for biodiversity research, especially with functional trait data.
• Functional redundancy influences the relationship between species richness and functional diversity.