Marine Protected Area Effectiveness: Ecosystem Recovery and Economic Co-Benefits in Southeast Asia
Objective
Quantify biodiversity recovery and fisheries productivity gains in no-take zones across Southeast Asian waters
Methodology
Mixed-methods analysis combining satellite imagery analysis, underwater acoustic monitoring, fish biomass sampling via catch curves, and participatory community assessment. Used interrupted time series to control for confounding factors (climate oscillation, fishing pressure spillover).
Findings
No-take zones showed 3.2x average fish biomass recovery within 5-7 years. Adjacent spillover zones saw 18-22% catch increases for small-scale fishers. Income per fisher increased 24-31% after 4-year lag (reinvestment period). Coral recovery initiated in 60% of zones. Community support increased from 34% to 78% over 8 years as catch benefits materialized.
Key Assumptions
- •Spillover effect sustainability assumes maintained no-take enforcement
- •Income benefits assume access to markets for spillover catch
- •Climate stability assumption for coral recovery trajectory
- •Community perception surveys assume honest reporting despite prior resource access loss
Limitations
- •Limited to Southeast Asian geographies - temperate zone results may differ
- •Data collection gaps during 2020-2021 pandemic
- •Socioeconomic benefits varied by gear type and household baseline wealth
- •No data on indirect effects (migration, alternative livelihood adoption)