Integrating comparative functional response experiments into global change research.

Area of Science:

• Ecology
• Behavioral Ecology
• Invasion Biology

Background:

• Non-consumptive effects (NCEs) in predator-prey interactions are increasingly recognized as ecologically significant, sometimes exceeding direct predation impacts.
• Understanding NCEs is crucial for predicting ecological dynamics, particularly in the context of biological invasions and global change.

Purpose of the Study:

• To introduce and validate a novel experimental framework for quantifying NCEs.
• To compare the functional responses and predator intimidation resistance of native and invasive consumers.

Main Methods:

• The study compared the functional response (feeding rate) of native and invasive intermediate consumers.
• This comparison was conducted both with and without the presence of a higher-level predator.
• The researchers assessed the consumers' resistance to predator-induced fear or stress.

Main Results:

• The invasive consumer demonstrated a higher direct feeding rate compared to the native consumer.
• The invasive consumer also showed greater resistance to intimidation by the higher predator.
• This suggests invaders may be less affected by predator presence.

Conclusions:

• The proposed experimental framework effectively quantifies NCEs.
• Invasive species may possess traits that confer resilience to predator NCEs, potentially facilitating their establishment and spread.
• This research offers a valuable tool for global change research, aiding in the assessment of invasion success and ecological impacts.