Structural and functional development of twelve newly established floodplain pond mesocosms

Area of Science:

• Freshwater ecology
• Ecosystem development
• Primary succession

Background:

• Ecosystems are complex, but the initial stages of development and colonization remain poorly understood.
• Floodplain pond mesocosms (FPMs) offer a controlled environment to study early ecosystem formation.

Purpose of the Study:

• To comprehensively monitor ecosystem development in newly established floodplain pond mesocosms over 21 months.
• To identify key drivers and patterns in abiotic and biotic parameters during early primary succession.

Main Methods:

• Monitoring of 20 abiotic and biotic parameters in twelve floodplain pond mesocosms (23.5m x 7.5m x 1.5m).
• Analysis of structural and functional variables over a 21-month period post-establishment.
• Application of Principal Component Analyses and Redundancy Analyses to identify significant drivers.

Main Results:

• All FPMs exhibited evolving ecosystem development and primary succession with fluctuating abiotic conditions.
• Season and succession time significantly influenced environmental conditions and community composition.
• Aquatic and terrestrial colonization occurred within the first month, with season-specific increases in richness and abundance.
• Increasing interpond variation in environmental conditions and communities contrasted with converging litter decomposition rates.

Conclusions:

• Provides rare insights into the initial stages of freshwater ecosystem formation and primary succession.
• Highlights the dynamic interplay between abiotic factors, biotic colonization, and functional processes in new pond ecosystems.
• Demonstrates distinct patterns in community development versus functional processes during early ecosystem formation.