Thailand
The Kingdom of Thailand is in Southeast Asia , bordering Laos and Cambodia to the east, the Gulf of Thailand and Malaysia to the south, and the Andaman Sea and Myanmar to the west.
Most of the seagrass meadows are multispecies, located in enclosed or semi-enclosed embayments from the intertidal area ot 5m in depth depending on seagrass species. Among the 12 species of seagrasses found in Thailand, Halophila ovalis is the most widely distributed, because of it’s ability to grow in different habitats. Enhalus acorodies, the largest species, is also common in the major seagrass areas. Seagrasses are more abundant in the Andaman Sea than in the Gulf of Thailand.
The four most important seagrass areas in Thailand are Haad Chao Mai National Park, in Trang province on the southern coast of the Anadaman Sea and just north of Malaysia, Ko Talibong (Talibong Island), also in the Trang Province, Kung Krabane Bay, in Chathaburi province on the eastern coast of the Gulf of Thailand, near Cambodia and Ko Samui (Samui Island), in Surat Thani province, and part of the southern coast of the Gulf of Thailand.
Seagrasses in Thailand are threatened by a combination of illegal fisheries and fishing practises, and land based activities especially mining. Another major threat is reduced water clarity in many areas resulting from upland clearing, development along rivers and destruction of mangroves.
The Asian Tsunami catastrophe on December, 26, 2004 affected many countries that share the waters of the Indian Ocean. It caused tremendous loss of life and property of millions of people and damaged to coastal areas.
In Thailand, the tsunami hit the Andaman Coast (954 kilometres in length) between 9.40 and 10.30 a.m. local time, severely impacting six coastal provinces along the Andaman Sea, namely: Ranong, Phang Nga, Phuket, Krabi, Trang and Satun. The most affected province is Phang Nga, in particular Khao Lak district. Phuket and Krabi provinces were also severely impacted. In Ranong, Trang and Satun provinces, offshore islands sustained severe damage, but lesser impacts were recorded on the mainland.
The seagrass meadows along the Andaman coast of Thailand cover an area of 7,937 hectares. To estimate the impacts of the tsunami disaster on the seagrass meadows, a rapid assessment was undertaken by the Department of Marine and Coastal Resources of MONRE covering approximately 70 per cent of the total seagrass area. Based on the results, 3.5 per cent of the inspected areas are impacted, through siltation and sand sedimentation, while 1.5 per cent of the inspected areas suffered total habitat loss. The most impacted sea grass meadows are those of Yao Yai Island, Phang Nga Province, which registered an estimated total habitat loss of 10 per cent.
The seagrass meadows of Talibong Island, Trang Province, which are the largest seagrass areas in Thailand’s Andaman coast providing foraging grounds to a large dugong population, did not suffer any loss, although 10 per cent of the area is impacted by siltation or superficial erosion. It is estimated that it will take three months for seagrass to recover from siltation. However, it is not yet known how long it will take to recover from sand sedimentation. The assessments also revealed that seagrass meadows covering the inter-tidal zone appear to have prevented soil erosion of beaches during the tsunami event, such as at Kuraburi, Phang Nga Province.
Seagrass-Watch in Thailand
To provide an early warning of change, long-term monitoring has been established in Thailand as part of the Seagrass-Watch, Global Seagrass Observing Network (www.seagrasswatch.org). Establishing a network of monitoring sites in Thailand provides valuable information on temporal trends in the health status of seagrass meadows in the region and provides a tool for decision-makers in adopting protective measures. It encourages local communities to become involved in seagrass management and protection. Working with both scientists and local stakeholders, this approach is designed to draw attention to the many local anthropogenic impacts on seagrass meadows which degrade coastal ecosystems and decrease their yield of natural resources.
Location
Trang
Monitoring: coming soon
Location: Haad Chao Mai National Park
Site code: To be advised
Issues: Benthic push-net fishing
Comments: Trang is the one of the southern provinces (changwat) of Thailand, and is located on the coast of the Andaman Sea, and contains 46 islands together with the mainland area.
The southern coast of the province is protected in the Mu Ko Phetra National Park.
Southern Thailand’s sunny, clear, inshore waters are ideal conditions for the lush seagrass which were ‘pastures’ for fish, crabs, prawns, molluscs, and most importantly, dugongs. The dugong was once abundant in these large expanses of seagrass along Thailand’s southern shores, until pushnets and intrusion by trawlers began to damage the ocean floor. Meanwhile, gill nets, pollution, noise, and habitat destruction have been blamed for the 75 dead dugongs which washed onto the districts’ shores between 1979 and 1998. When a dugong began to frequent the coastal waters along the regenerated sea grass bed of Ban Chao Mai village in 1995, it caused a stir in the media as live dugongs had not been seen in a long time, and most young people had never seen one.
Location
Koh Phra Thong Island
Monitoring: ongoing
Principal watchers: Barry Bendell, Pa Nee
Location: Khura Buri District
Site code: PT1, PT2, PT3, Pt4, PT5, PT6
Issues: fishing, run off
Comments: Ko Phra Thong is an island in Khura Buri District, southern Thailand on the Andaman Sea, and is the middle link in a chain of three islands.
On Phra Thong Island, local communities have established protected areas in seagrass meadows where the harvesting of all animals is prohibited.