Does fire disturbance affect ant community structure? Insights from spatial co-occurrence networks.

Area of Science:

• Ecology
• Community Ecology
• Network Analysis

Background:

• Multispecies coexistence relies on complex interactions, forming ecological networks.
• Anthropogenic disturbances, like wildfires, can significantly impact these co-occurrence patterns.
• Wildfires may intensify competition in ant communities by favoring aggressive species and increasing encounters.

Purpose of the Study:

• To investigate how wildfires affect ant co-occurrence patterns.
• To analyze the macro and microscopic structure of ant interaction networks in burned and unburned habitats.
• To understand the mechanisms driving changes in ant communities due to fire disturbance.

Main Methods:

• Constructed co-occurrence networks using significant species aggregations (positive) and segregations (negative).
• Analyzed aggregate network properties and microscopic structural changes.
• Compared species and interaction turnover between burned and unburned sites.

Main Results:

• No significant differences were found in the macroscopic structure of co-occurrence networks across fire regimes.
• Significant changes were detected in species composition and the prevalence of negative interactions.
• Interaction turnover was primarily driven by rewiring between shared species, not species replacement.

Conclusions:

• Fire disturbance alters ant communities, affecting species composition and interaction networks.
• Changes in species and negative interactions suggest modified species roles and spatial distribution.
• Species co-occurrence network analysis is valuable for understanding disturbance impacts on biodiversity.