Top predators and habitat complexity alter an intraguild predation module in pond communities

Area of Science:

• Ecology
• Aquatic Ecology
• Community Ecology

Background:

• Predator diversity and habitat complexity are key drivers of species interactions.
• Their combined effects on intraguild predation modules are understudied.
• Larval salamanders provide a model system for investigating these interactions.

Purpose of the Study:

• To investigate how top predator identity and habitat complexity influence an intraguild predation module.
• To understand the effects on two larval salamander species: Ambystoma annulatum (intraguild predator) and A. maculatum (intraguild prey).

Main Methods:

• Outdoor mesocosm experiments were used to manipulate predator food webs and habitat complexity.
• The study focused on the body condition and survival rates of both salamander species.

Main Results:

• Top predators significantly affected the body condition and survival of Ambystoma annulatum.
• Habitat complexity had minimal direct impact on Ambystoma annulatum.
• A three-way interaction involving top predator identity, habitat complexity, and A. annulatum survival influenced A. maculatum outcomes via indirect effects.

Conclusions:

• Top predator identity and habitat complexity interact to shape intraguild predation dynamics.
• These interactions subsequently affect the survival and body condition of the intraguild prey.
• Future research should explore predator attributes and environmental factors in complex food webs.