Functional trait analysis reveals the hidden stability of multitrophic communities

Area of Science:

• Ecology
• Environmental Science
• Community Ecology

Background:

• The relationship between diversity and stability in multitrophic ecosystems is crucial for predicting responses to global change but remains debated.
• Current understanding primarily stems from competitive guilds, where functional diversity shows a stronger, more mechanistic link to stability than species diversity.

Purpose of the Study:

• To empirically investigate how functional trait identity relates to spatial and temporal stability in coastal pond fish communities.
• To compare the roles of functional trait diversity and species diversity in determining community stability.

Main Methods:

• Measured 13 functional traits for six coastal pond fish communities.
• Analyzed temporal and spatial community stability using both functional trait diversity and species diversity metrics.
• Examined correlations between species identity, functional traits, and trophic positions.

Main Results:

• Relying solely on species composition can underestimate ecosystem stability.
• Observed spatial convergence and temporal divergence in species and trait variability, linked to deterministic community assembly processes.
• Correlations between species and key functional traits enabled inferences about trophic position and trait stability.

Conclusions:

• Functional trait identity is a critical, often underestimated, component of community stability.
• Deterministic assembly processes influence spatial and temporal dynamics of species and traits.
• Utilizing functional trait knowledge for inferring community processes and guiding conservation is a viable strategy, especially under resource limitations.