Quantifying the effects of response diversity dynamics on ecosystem stability.

Area of Science:

• Ecology
• Environmental Science
• Biodiversity Research

Background:

• Ecosystem stability relies on species' varied responses to environmental change (response diversity).
• Quantifying response diversity is difficult due to context-dependent and dynamic species reactions.
• Existing methods often assume static responses or equilibrium conditions.

Purpose of the Study:

• To develop a novel framework for quantifying response diversity that accounts for time-variability and complex interactions.
• To investigate the role of response diversity in stabilizing ecosystem biomass in a real-world aquatic system.
• To explore how environmental conditions influence the stabilizing effect of response diversity over time.

Main Methods:

• Developed a framework to quantify response diversity, incorporating time-variability and high-dimensional interactions.
• Utilized 40 years of monthly data from Lake Geneva for phytoplankton and zooplankton communities.
• Analyzed context-dependency of species responses to biotic and abiotic factors.

Main Results:

• Response diversity stabilizes phytoplankton and zooplankton biomass within trophic levels, but not across them.
• The stabilizing influence of response diversity on biomass is not constant but varies significantly over time.
• Time-varying environmental conditions were identified as key drivers of this context-dependent stabilizing effect.

Conclusions:

• The proposed framework effectively quantifies dynamic response diversity in complex ecological systems.
• Response diversity plays a crucial role in stabilizing ecosystem biomass, but its impact is temporally variable and context-specific.
• Understanding these dynamic relationships is key to linking biodiversity patterns with ecosystem functioning and stability.