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Advancing Sunda gharial conservation

Conservation focus:

Sunda (or false) gharial

Scientific name:

Tomistoma schlegelii

Scientific classification:

Reptiles, crocodylidae

IUCN status:

EDGE status:

EN (endangered)

Score 25, Rank 3 / 6 EDGE crocodiles

Threatened evolutionary history:

25 million years

Conservation priority by EDGE rank / ecosystem

Advancing Sunda gharial conservation
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Why it matters

The Sunda gharial is a very old, highly unusual and, at less than 2400 individuals, a very rare and endangered species. Due to its hidden, nocturnal way of life in forested inland wetlands of Southeast Asia, it is also one of the least studied crocodiles. Even fundamental knowledge is lacking. In order to effectively protect this species, we must understand it a lot better. This pioneer study investigates movement patterns and home range sizes of the Sunda gharial in its last stronghold in Sumatra - a species-rich habitat with the last remnants of primary peat forest and peat swamps in all of Southeast Asia. In short, a prime example of high-priority conservation!

Project fast facts

Focal species' population trend

Decreasing

Local conservation attention

Low

Range / Project area

Ecological role

Although further evidence is needed, the Sunda gharial plays multiple ecological roles — as an apex predator, as prey during different ontogenetic stages, and as a nutrient transporter. Its functional distinctiveness (FUD) score is 41.26, indicating unusual or unique trait combinations that make it likely to be ecologically irreplaceable. This score is the second highest among crocodilians and is shared with the Indian gharial (Gavialis gangeticus).

Threats

The Sunda gharial faces complex, interlinked threats across its range. Habitat loss and fragmentation from peatland drainage, oil palm expansion, logging, and fires have drastically reduced suitable wetlands. Human-crocodile conflict is rising as encroachment increases, often leading to retaliatory killings. At least in Sumatra, a significant threat appears to be predation of eggs by the introduced Wild boar (Sus scrofa). Unsustainable fisheries, ghost gear, and incidental capture add further pressure, yet their impacts remain poorly understood. Weak enforcement and the absence of long-term monitoring hinder our understanding of trends and conservation outcomes. Climate change further disrupts hydrological regimes vital for nesting and prey. Despite these escalating pressures, conservation action remains scarce and fragmented—driven by a few dedicated individuals and groups working voluntarily with limited resources. The lack of sustained coordination leaves major knowledge and action gaps, threatening both the species’ recovery and the integrity of peat swamp ecosystems like Berbak NP.

Grant

First awarded:

GBP 5,000

1 December 2025

Score 25, Rank 3 / 6 EDGE crocodiles

Programme owner

KONKLUSI - Kolaborasi Inklusi Konservasi (Yayasan)

Programme contact

Herdhanu Jayanto

Project location

South-East Asia, Indonesia

Balai Taman Nasional Berbak Sembilang, Jl. Yos Sudarso No.28b, Sejinjang, Kec. Jambi Tim., Kota Jambi, Jambi 36262, Indonesia

Addressing the need: Project goals

Our goal is to advance Tomistoma conservation by fostering grassroots initiatives connected under a shared mission. We aim to establish standardized Conservation Impact and Recovery Assessments to guide 10–100 year plans and create practical monitoring tools for non-specialists.

The project aims to produce a Green Status Assessment and a Population Monitoring Guideline for Non-Specialists of Tomistoma, both to be formally recognized by Indonesian authorities and the IUCN SSC. These outputs will form the foundation for establishing a Grassroots Tomistoma Task Force and developing a National Tomistoma Conservation Action Plan. Key actions within the project scope include:
(1) By the end of2026, the Green Status Assessment will be completed and submitted to the IUCN SIS;
(2) robust and cost-effective methods for population and impact assessments will be tested in Berbak–Sembilang National Park;
(3) The Monitoring Guideline will be finalized and validated by early 2027, and finally followed by
(4) a soft launch and stakeholder engagement event by mid-2027 to nudge acknowledgement, adoption and wider collaboration.

Conservation actions

While the project may not immediately improve Tomistoma’s recovery within its short timeline, it will catalyze systemic improvements for the species’ long-term recovery. The Green Status Assessment will define clear baselines, measure conservation dependence, and outline realistic yet ambitious recovery pathways across its native range. Together with robust monitoring guidelines, it will guide action across protected areas and other effective conservation measures (OECMs), ensuring ongoing conservation not ceased – but improved so natural recovery can take root. By fostering coordinated grassroots initiatives under shared leadership, the project will strengthen local-to-global collaboration and elevate ambition for Tomistoma recovery. Together, these contributions will enable measurable progress toward a resilient and sustainable future for the species.

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