Flexible architecture of inducible morphological plasticity

Area of Science:

• Ecology
• Evolutionary Biology
• Developmental Biology

Background:

• Prey organisms face shifting predator regimes and predation risks.
• Flexible inducible morphological defenses are not universally observed in nature.
• Understanding how prey adapt to sequential predator changes is crucial for evolutionary ecology.

Purpose of the Study:

• To investigate if prey exhibit flexible inducible morphological defenses in response to sequential changes in predation regimes.
• To determine if prey can modify their defensive phenotypes in response to altered predator species or predation risk intensity.
• To assess the energetic costs and adaptive benefits of flexible morphological changes in prey.

Main Methods:

• Used Rana pirica tadpoles as a model prey species.
• Exposed tadpoles to different predator species (Hynobius retardatus salamanders and Aeshna nigroflava dragonflies).
• Manipulated predator presence by removal or exchange to observe phenotypic shifts in tadpoles.

Main Results:

• Rana pirica tadpoles exhibited predator-specific defensive morphologies (increased body/tail depth vs. salamanders, tail depth vs. dragonflies).
• Tadpoles reverted to a non-defensive phenotype when predators were removed, indicating costs of maintaining defenses.
• Tadpoles flexibly shifted between predator-specific phenotypes upon predator exchange, modifying only necessary body parts.

Conclusions:

• Rana pirica tadpoles possess flexible inducible morphological defenses that adapt to sequential changes in predator regimes.
• Partial morphological modifications reduce the time and energy costs associated with repetitive defensive changes.
• Flexible inducible defenses are adaptive, allowing prey to efficiently respond to dynamic predation pressures.