A Nonequilibrium Framework for Community Responses to Pulse Perturbations.

Area of Science:

• Ecology
• Community Ecology
• Ecological Dynamics

Background:

• Ecological communities are increasingly impacted by extreme climatic events, leading to shifts in species abundances.
• Existing theories primarily address community responses at equilibrium, neglecting complex dynamics like transients and cycles.
• A unified framework is needed to understand how non-equilibrium communities respond to pulse perturbations.

Purpose of the Study:

• To develop a novel framework for quantifying species abundance amplification in ecological communities experiencing non-equilibrium dynamics.
• To introduce metrics for minimum, typical, and maximum amplification of perturbed abundances.
• To provide a tool for analyzing ecological models and data from communities not at equilibrium.

Main Methods:

• Derived new metrics to quantify the amplification of perturbed species abundances.
• Simulated ecological models under various non-equilibrium scenarios.
• Assessed the short-term and long-term amplification of perturbed abundances.

Main Results:

• The developed metrics accurately characterize the full range of abundance amplification in short and long terms.
• Perturbation amplification is strongly dependent on the community state in the short term.
• This state dependency of perturbation amplification disappears in the long term.

Conclusions:

• The new framework successfully quantifies responses of non-equilibrium ecological communities to perturbations.
• The findings highlight the dynamic nature of perturbation amplification, varying with community state and time.
• This approach offers valuable insights for understanding and managing ecological communities facing environmental change.