Apparent decoupling of eco-evolutionary dynamics in a dual-trait predator-prey interaction.

Area of Science:

• Ecology
• Evolutionary Biology
• Theoretical Biology

Background:

• Predator-prey coevolution often results in Red Queen dynamics, characterized by reciprocal selection and trait oscillations.
• These evolutionary cycles can destabilize populations and impede species coexistence.
• Traditional models typically examine evolution along a single ecological axis.

Purpose of the Study:

• To extend classic eco-evolutionary models by incorporating multidimensional trait evolution.
• To investigate how evolution along multiple trait dimensions affects population dynamics and stability.
• To explore the conditions under which ecological stability can coexist with persistent coevolutionary cycles.

Main Methods:

• A classic eco-evolutionary framework was extended to allow predator and prey to evolve along two distinct trait dimensions.
• The model simulated interactions involving spatial and temporal niche evolution.
• Mathematical analysis was used to examine the impact of trait evolution on population dynamics.

Main Results:

• In contrast to one-dimensional models, rapid prey evolution in a multidimensional trait space can stabilize population dynamics.
• A stable ecological equilibrium can be achieved even with persistent coevolutionary trait cycles.
• This decoupling arises when prey evolution is constrained across trait axes, creating lags and weakening the impact of trait changes on population sizes.

Conclusions:

• Multidimensional trait evolution fundamentally alters eco-evolutionary outcomes.
• Apparent ecological stability may mask ongoing evolutionary arms races.
• Constraints on multidimensional adaptation are key to stabilizing population dynamics during coevolution.