Assessing confinement in coastal lagoons.

Area of Science:

• Ecological indicators
• Aquatic systems ecology
• Coastal geomorphology

Background:

• Transport scale measures are crucial for defining ecological indicators in aquatic systems.
• Confinement is a proposed parameter for understanding biological community spatial structure in transitional environments.
• Direct experimental measurement of confinement is currently lacking.

Purpose of the Study:

• To propose and validate a methodology for experimentally measuring confinement in aquatic systems.
• To analyze factors influencing confinement calculations, including spatial and temporal variability.
• To provide recommendations for using confinement as an ecological indicator.

Main Methods:

• Utilizing a passive marine tracer's accumulation rate within a lagoon to measure confinement.
• Analyzing the sensitivity of confinement to seasonal climate variations, riverine inputs, and tidal exchange parameterization.
• Case study application in the Lagoon of Venice.

Main Results:

• A novel methodology for quantifying confinement using passive tracer accumulation was developed.
• The study analyzed the spatial and temporal variability of confinement.
• Sensitivity analyses revealed confinement's response to climatic forcing, river inputs, and tidal dynamics.

Conclusions:

• The proposed methodology offers a direct experimental measure for confinement.
• Understanding confinement variability is essential for ecological assessments in transitional waters.
• This research provides a foundation for using confinement as a robust ecological indicator.