Size dependent antipredator responses in a fish-shrimp mutualism

Area of Science:

• Behavioral Ecology
• Animal Behavior
• Predator-Prey Dynamics

Background:

• Antipredator responses are crucial for prey survival but involve trade-offs with feeding and reproduction.
• Prey are predicted to adjust their defensive behaviors based on perceived threat levels.

Purpose of the Study:

• To investigate the impact of simulated predatory threats on the antipredator behaviors of wild sandy prawn-gobies (Ctenogobiops feroculus).
• To examine how body size and mutualistic partnerships with Alpheus shrimp influence risk-taking strategies.

Main Methods:

• Wild goby-shrimp pairs were repeatedly exposed to a simulated predatory threat over three occasions.
• Antipredator behaviors, including re-emergence time and flight initiation, were measured for both goby and shrimp partners.
• Goby body size and the body size matching between goby and shrimp partners were recorded.

Main Results:

• Re-emergence from burrows was slower in larger gobies compared to smaller ones.
• Smaller gobies showed quicker re-emergence and initiated flight earlier when the threat was more distant.
• Goby and shrimp partners exhibited synchronized body sizes and interdependent risk-taking behaviors.

Conclusions:

• An individual's phenotype (body size) and perceived danger influence its risk-taking strategy.
• Mutualistic partners demonstrate similar sensitivities to risk, with their behaviors being highly dependent on each other.
• This study enhances understanding of behavioral plasticity in response to predation risk within a mutualistic context.