Barry Bendell

Community-Based Seagrass Monitoring and Conservation at Phra Thong Island

A view of meadow at low tide. Photo by Piyapat Nakornchai.

Conches.

Monitoring. Photo by Piyapat Nakornchai.

Standards of Halophila ovalis.

Town/RegionCountryCategoriesDate
Phra Thong IslandThailandAsia, Mangroves, Wetlands21 Dec 2009

Seagrass meadows are a vital fisheries resource for coastal communities such as those on Phra Thong Island in Thailand They are an important source of fish, molluscs, crustaceans, and sea cucumbers for local fishers, and are a nursery habitat for juvenile fish. They are also an important wildlife habitat. Seagrasses are food for green turtles and dugongs, both of which are endangered locally, and have been the target of major conservation efforts regionally.

This project aims to document the seagrass resources at Phra Thong Island, increase local awareness of the benefits of conserving the habitat, and develop a community-based program to monitor the long-term viability of the meadows around the island. The project site is near Lion village, which was built to replace another village completely destroyed by the Asian tsunami of 26 December 2004. The local community has since been working with NGOs, Mangrove Action Project (MAP) and Naucrates, to promote community-based management of coastal resources and environmental education. Seagrass meadows near the village provide a rich harvest of rabbitfish and groupers, and many invertebrate animals, such as conch, sea cucumber and crab. The project will map those meadows to provide a basis for any future regulation or zoning of the exploitation of those resources.

Educational materials will be developed for the local resource centre, and for use in a community eco-tourism project. Seagrass monitoring sites have already been established near the village, and will be monitored at three-month intervals through the year. Community members will be trained in monitoring using the general procedures of the Seagrass-Watch Program, which will be adapted to meet local conditions. Participants will learn to identify seagrass species, estimate their percent coverage in quadrats, and record other relevant information from fixed plots. It is expected that a group of community members will develop with the knowledge and skills for the long-term monitoring of seagrass meadows beyond the time of the project, and that the increased knowledge and awareness of the seagrass habitat will lead to the development of management planning for its sustainable use and conservation.

For further information contact mapasia@loxinfo.co.th

Project Update: August 2010

Regular monitoring of two seagrass plots has been ongoing at Lion Village. Significant changes in the amount of seagrass cover in those plots have occurred during the year. The pattern of those changes suggests that seagrass cover increases during the dry season (approximately November to April), but decreases during the rainy season (May to October). Continued monitoring is needed to verify that conclusion. The survey and mapping of the meadow has shown that 9 species occur there. Halophila ovalis is a small species that covers the greatest area of the meadow, and is dominant in the monitored plots. It is the favoured food of the dugong, a large herbivorous mammal that is rare in Thailand. Unexpectedly, we have seen regular evidence of dugong feeding in the meadow at Lion Village. They dig up the roots of the seagrass and leave distinctive tracks in the meadow where they have fed.

Project Update: December 2010

The measure of sea grass used in monitoring is an estimate of the percentage area within a quadrat that is covered by vegetation. Those estimates are made by visually comparing the cover observed in the quadrat with photographic standards. Standards of Halophila ovalis cover were developed by taking photographs of the sea grass within quadrats over a range of densities and estimating the percent coverage using image analysis techniques. Those standards that will give results of a consistent quality for continued monitoring at this site, and others like it.

The local community supports and understands the monitoring process. However, participation in regular monitoring has been less than hoped. Villagers are most interested in conserving species that they harvest from the meadow, such as sea cucumbers and conch. They hope to establish a no-take zone which will protect those resources from overexploitation, and this will be the focus of further work at the site.

Final Report

Read more about the activities undertaken and findings of this project in the final report below.

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Final Report727.5 KB

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