WHAT THE EVIDENCE SAYS
High-frequency dissolved oxygen at six sites over 2014–2025 revealed heterotrophy in outer channels, internal production in invasive-plant-dominated central reaches, and decreased metabolism when a drought flow barrier isolated channels. Wastewater treatment upgrades produced negligible detected metabolic changes.
WHY IT MATTERS / OUR READ
Controlling water movement can change carbon transport even when a local water-quality improvement appears ecologically quiet; estuary management needs whole-delta flow and biological context.
CAVEATS / UNCERTAINTY
Oxygen-based metabolism integrates multiple organic-carbon pools; correlations around flow barriers are context-specific and not direct whole-ecosystem restoration outcomes.
SOURCE
Estuaries and Coasts — Volaric et al. (2026)
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