Temperature or competition: Which has more influence on Mediterranean ant communities?

Area of Science:

• Ecology
• Zoology
• Entomology

Background:

• Ant communities are shaped by temperature and interspecific competition.
• Temperature affects ant foraging efficiency based on species-specific thermal tolerances.
• Competition is evident through species replacements during resource exploitation.

Purpose of the Study:

• To investigate interspecific competitive interactions among ant communities.
• To assess the influence of temperature and numerical dominance on competitive outcomes.
• To develop a thermal competition index (TCI) for quantifying these interactions.

Main Methods:

• Ants were sampled using pitfall traps and baits across three distinct Mediterranean habitats.
• Temperature was measured during interspecific competitive interactions.
• A thermal competition index (TCI) was created to evaluate the roles of temperature and worker proportion.

Main Results:

• Temperature had varied effects on ant activity across different habitats, modulating competitive interactions.
• The TCI indicated that species success in pairwise interactions depended on worker proportion and temperature advantages.
• Both temperature effects (higher TCI) and numerical superiority (higher worker proportion) increased success probabilities.

Conclusions:

• Interspecific competitive relationships in Mediterranean ant communities are significantly influenced by temperature.
• These competitive dynamics are also dependent on the specific habitat characteristics.
• Temperature acts as a crucial factor modulating the outcome of ant competition.