Case Study: Kenya

1. Outcome

This Circular documents a SEEA Ecosystem Accounting pilot compiled for Kenya's coastal counties (Kilifi and Kwale, with adjoining Tana River and Mombasa). It demonstrates how field-based condition surveys, remote-sensing extent data and county fisheries statistics can be combined into a coherent set of extent, condition and ecosystem-services accounts for three coastal ecosystem types—mangroves (MFT1.2), coral reefs and seagrass meadows (M1.1).

2. Requirements

• TG-0.1 General Introduction
• TG-1.10 Reporting Frameworks
• TG-3.11 Ecosystem Services Accounts

3. Case Study Material

3.1 Country Context

Kenya's coastline supports three SEEA-EA priority ecosystems—mangrove forests, fringing coral reefs and seagrass meadows—that together underpin small-scale fisheries, tourism and shoreline protection. The pilot was scoped around Kilifi and Kwale counties, with mangrove surveys also extending into Kilifi Creek, Mida Creek (Watamu MNR/MNP), Marereni and the Tana Delta. Roughly 66% of the country's mangrove extent falls within the WDPA protected-area network, anchored by Watamu Marine National Park (≈1,763 ha) and a constellation of forest reserves and community conservancies.

3.2 Implementation Approach

The pilot combined three streams of evidence with reference levels drawn from WIO regional literature (GCRMN 2021, Obura et al. 2022, Hughes et al. 2010) and a SEEA-EA composite condition indicator (CI) on a 0–1 scale:

3.3 Worked Accounts

3.3.1 Mangrove extent account (2020 vs 2025)

3.3.2 Mangrove condition account (2025)

Composite CI averaged across plots, by protection status:

Mida Creek plots show higher canopy cover and overall composite condition than unprotected creek systems, despite similar stem density. Species composition is dominated by Rhizophora mucronata, Ceriops tagal and Avicennia marina.

3.3.3 Coral-reef condition account—multi-period (Nov 2024 → Jul 2025)

Mean values across surveyed sites, against WIO reference levels:

The Nov 2024 → Jul 2025 window (≈15 months post 2023–24 bleaching peak) captures simultaneous loss of live coral cover and recovery of the surviving colonies' health—consistent with mortality of bleached colonies and reduced thermal stress. Watamu Coral Garden (no-take MPA) saw live cover of 22.5% in Jul 2025 with 91% of remaining colonies healthy and 0% bleached, against 70.8% healthy and 29.2% dead in Nov 2024.

3.3.4 Seagrass condition account (2024)

Composite CI per site (mean of cover, richness and shoot-density CIs; reference = 60% cover, 8 species, WIO shoot-density baselines):

Cover is uniformly high relative to the 60% provisional reference; the binding constraint on the composite is species richness (max observed = 8 at Ngomeni).

3.3.5 Reef-attributed fisheries supply—physical and monetary

Reef catch is derived from county landings via species-group attribution fractions (e.g., snapper 90%, parrotfish 90%, surgeonfish 85%; pelagic species 0–10%) with a habitat-overlap uplift to a central reef-attribution fraction of ~30–55%.

3.3.6 Resource-rent sensitivity (2024)

Central reef revenue USD 9.15 M (reef fraction 0.40, cost ratio 0.62) gives a resource rent of USD 3.48 M. Bounding cases:

3.4 Decision Applications

• MPA effectiveness. Pairing mangrove composite CI by protection status with the WDPA-overlaid extent account provides a tractable indicator of management effectiveness without requiring full economic valuation.
• Bleaching response monitoring. The Nov 2024 → Jul 2025 coral comparison demonstrates a repeat-survey cadence that detects bleaching-driven loss and post-event recovery on a single fiscal cycle.
• Blue-economy planning. The reef-attributed fisheries account links coral-reef condition to a defensible monetary resource-rent estimate, supporting cost-benefit framing for reef management investments under Kenya's blue-economy agenda.

3.5 Lessons Learned

1. Reference levels are the binding methodological choice. Seagrass and mangrove composite CIs are highly sensitive to provisional WIO references; published regional baselines for canopy height and shoot density remain incomplete.
2. Multi-period coral surveys reveal "compositional" recovery. Cover declined while the proportion of healthy surviving colonies rose—a single-indicator account would mis-state the trajectory.
3. Attribution fractions drive valuation. A 30–55% reef-fraction range alone moves the 2024 resource rent across roughly USD 2.1–5.7 M; the species-group attribution table must be validated before publication.
4. Protected vs unprotected stratification is essential. Two-thirds of mangrove extent sits within WDPA, but unprotected stands carry materially lower canopy-cover CI—aggregate national figures mask this.

3.6 Data Gaps and Caveats

• Reef-fisheries attribution fractions are PROVISIONAL pending Dr. Pascal Thoya validation (2026-03-16).
• 2023 county catch figures are KeFS estimates; treat with caution.
• Seagrass reference levels for canopy height and several shoot-density species are unpublished—max-observed-across-sites is used as an interim reference.
• Coral cover for Jul 2025 reflects only 5 sites with full benthic transects; some Nov 2024 sites were not re-surveyed.
• Mangrove condition sampling is sparse (22 accounting units, often 2–3 plots each); confidence intervals are wide.

4. Acknowledgements

Authors: [To be confirmed]

Reviewers: [To be confirmed]

Data partners: Kenya Fisheries Service (KeFS); Kenya Wildlife Service (Watamu/Malindi MNP/MNR); CORDIO East Africa; Global Mangrove Watch.

5. References

Source data: Kenya_accounts/Kenya/03_outputs/ (accounts, mangrove, coral_reef, seagrass, services). Reference benchmarks: GCRMN (2021); Obura et al. (2022); Hughes et al. (2010); Hoegh-Guldberg (1999); Bourne et al. (2009); Dulvy et al. (2021).