Mutualistic cleaner fish maintains high escape performance despite privileged relationship with predators

Area of Science:

• Marine biology
• Evolutionary ecology
• Animal behavior

Background:

• Mutualistic cleaner fish (Labroides dimidiatus) interact with predatory fish that do not consume them.
• Compensated trait loss suggests that mutualism can reduce selection for certain traits.
• Predators rarely eat cleaner fish, potentially relaxing selection on escape performance.

Purpose of the Study:

• To investigate if the mutualistic relationship with predators has led to reduced escape performance in cleaner fish.
• To test the hypothesis that relaxed predation pressure reduces the need for escape capabilities in cleaner fish.
• To explore the role of client-cleaner conflicts in maintaining escape performance.

Main Methods:

• Compared the fast-start escape performance of Labroides dimidiatus with five related wrasse species.
• Quantified escape performance metrics to assess differences in speed and acceleration.
• Analyzed escape capabilities in the context of predator-prey and client-cleaner interactions.

Main Results:

• Cleaner fish (Labroides dimidiatus) did not exhibit reduced escape performance compared to related species.
• The mutualistic relationship with predators has not led to a loss of escape capabilities.
• Escape performance appears to be maintained by the need to evade dissatisfied clients.

Conclusions:

• Compensated trait loss was not observed in cleaner fish despite their relationship with predators.
• Conflicts during cleaning interactions likely maintain selective pressures for strong escape abilities.
• Compensated trait loss may require high interdependence and low temptation to cheat between mutualistic partners.