Dung beetles increase plant growth: a meta-analysis

Area of Science:

• Ecology
• Environmental Science
• Soil Biology

Background:

• Dung beetles provide vital ecosystem services, including nutrient cycling and soil enrichment through dung burial.
• While their positive impact on plant growth is recognized, a quantitative synthesis of existing research was lacking.

Approach:

• A multi-level meta-analysis was conducted on 24 publications investigating dung beetle effects on plant growth.
• This approach synthesized quantitative data to estimate the average effect and identify moderating factors.

Key Points:

• Dung beetles increased plant growth by an average of 17% (95% CI: 1%–35%).
• Plant measurement type and the number of dung beetles accessing dung significantly influenced this relationship.
• Individual study effect sizes varied widely (-72% to 806%), indicating context-specific outcomes.

Conclusions:

• Dung beetle activity generally promotes plant growth, contributing to ecosystem health.
• The magnitude of this effect is context-dependent, influenced by ecological and experimental factors.
• Further research should consider these variables for accurate ecosystem service assessment.