Species richness increases fitness differences, but does not affect niche differences

Area of Science:

• Ecology
• Theoretical Ecology
• Community Ecology

Background:

• Modern coexistence theory explains species persistence via niche and fitness differences.
• Most studies focus on species pairs, leaving multispecies dynamics less understood.
• Investigating how these differences scale with species richness is crucial.

Discussion:

• Mathematical proof shows average fitness differences increase with species richness.
• Average niche differences remain constant with increasing species richness.
• These findings hold for invariant average interaction strengths.

Key Insights:

• Species richness is ultimately limited by increasing fitness differences exceeding constant niche differences.
• This ecological balance shifts as more species accumulate in an ecosystem.
• The study provides a framework for understanding coexistence in multispecies communities.

Outlook:

• Further research can explore how varying interaction strengths affect these dynamics.
• Empirical validation across diverse ecosystems will strengthen these findings.
• This work advances theoretical foundations for community ecology and biodiversity maintenance.