{"id":60072816,"date":"2025-03-11T15:14:15","date_gmt":"2025-03-11T15:14:15","guid":{"rendered":"https:\/\/dialogue.earth\/?p=60072816"},"modified":"2025-03-24T16:33:33","modified_gmt":"2025-03-24T16:33:33","slug":"seagrass-loss-leaves-thailands-dugongs-struggling-to-survive","status":"publish","type":"post","link":"https:\/\/dialogue.earth\/en\/ocean\/seagrass-loss-leaves-thailands-dugongs-struggling-to-survive\/","title":{"rendered":"Seagrass loss leaves Thailand\u2019s dugongs struggling to survive"},"content":{"rendered":"\n

When Piyarat Khumraksa started combing through five years of Thai government data on dugong deaths, she did not anticipate uncovering a crisis of national significance. The Department of Marine and Coastal Resources (DMCR) had recorded far more deaths in 2023 and 2024 than previous years, but the reason was not clear.<\/p>\n\n\n\n

Khumraksa is a marine veterinarian who works along southern Thailand\u2019s coastal provinces of Krabi, Trang and Satun. She is based at the Marine and Coastal Resources Research Centre, overlooking the lower Andaman Sea. Here, once-thriving seagrass meadows have been disappearing, along with the dugongs that rely on them for sustenance. <\/p>\n\n\n\n

\u201cWe first noticed problems with the seagrass five years ago, but it became critical in 2023 and 2024,\u201d Khumraksa says. \u201cThe dugongs that were living in this area have now migrated to find seagrass along the west coast in Phuket, Phang Nga and Ranong provinces. This is the first time we have witnessed such a thing happening.\u201d<\/p>\n\n\n\n

When dugongs are washed ashore in Thailand, they are rarely alive. A deceased animal that washed up in Krabi province on 30 December brought the total death count to 45<\/a> last year. In 2023, there were 40<\/a> deaths. In October 2024, the minister for natural resources and the environment, Chalermchai Srion, stated that dugong mortality in Thailand usually averages 13 per year.<\/p>\n\n\n\n

Stranding hotspots are concentrated in Trang province, especially around Mook and Libong islands. Khumraksa says this is where previously vast seagrass beds have vanished. Dialogue Earth spoke to Milica Stankovic, who works in the lab at the Seaweed and Seagrass Research Unit at southern Thailand\u2019s Prince of Songkla University. She shares the example of Krabi\u2019s Ao Nammao Bay, where seagrass coverage has plummeted from a healthy 60%, to 1% in 2024.<\/p>\n\n\n\n

A leading theory behind the seagrass die-off is changes in global climate patterns that trigger cascading effects. One of those effects is unusually low tides around Thailand, which fatally expose swathes of seagrass.<\/p>\n\n\n\n

Various efforts are now being made to support Thailand\u2019s dugongs, including seagrass restoration. But there are fears the population will not be able to recover to its former size.<\/p>\n\n\n\n

Plummeting numbers<\/strong><\/h2>\n\n\n\n

According to a DMCR survey<\/a>, Thailand had 273 dugongs in its surrounding waters in 2022, mostly living along the west coast in the Andaman Sea. Based on recorded deaths alone, Thailand may have since lost around one-third of that population. The true toll may be even higher, as many carcasses likely go undiscovered.<\/p>\n\n\n\n

Dugongs are categorised as vulnerable<\/a> on The International Union for Conservation of Nature\u2019s Red List of Threatened Species. That is one stage before endangered. The only purely marine grazing mammal alive today, they feed almost exclusively on seagrass. This was once abundant in the warm, shallow waters of the Andaman Sea off south-west Thailand.<\/p>\n\n\n\n

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Recommended<\/span><\/span><\/div><\/a>\n\n\n\n

Historically, dugongs were hunted for their tusks, meat and even their tears, which were used for their supposed aphrodisiac properties. They have been protected under Thai law since 1961. Today, hunting poses less of a threat, as the spiritual significance of the dugong has evolved to protective respect. The animal has also become valued for its appeal to ecotourists.<\/p>\n\n\n\n

Despite this legal protection, the trend of losses highlighted by Khumraksa raises worrying questions. <\/p>\n\n\n\n

Many of the dugongs that washed out of the Andaman Sea between January 2019 and November 2024 were emaciated. Only 12% of dugong deaths could be attributed to direct anthropogenic factors, such as fishing gear entanglement or boat collisions. While some tusk poaching was observed, Khumraksa says this appeared to be opportunistic and occurred after death. According to autopsies, plastic ingestion was also minimal, ruling out this pollution as the primary cause of death.<\/p>\n\n\n\n

In 40% of dugong deaths, the exact cause could not be determined due to advanced decomposition. Khumraksa says she has begun seeking out help from universities and researchers, so that she might investigate what constitutes \u201cnatural causes\u201d among these deaths. She wants to establish whether starvation, disease, or a combination of factors could be responsible for the recent spike. So far, her own findings already point to a clear trend: as seagrass meadows decline, dugong deaths increase.<\/p>\n\n\n\n

Low tides and no green grass<\/h2>\n\n\n\n

While many researchers are linking seagrass decline to the rise in dugong deaths, the authorities remain cautious. The DMCR\u2019s director-general, Pinsak Suraswadi, cites other factors \u2013 such as disease, grazing pressure from other species and habitat damage from coastal developments \u2013 that could also be contributing to the crisis. Nevertheless, the widespread loss of seagrass remains a major concern.<\/p>\n\n\n\n

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Recommended<\/span><\/span><\/div><\/a>\n\n\n\n

While seagrass naturally experiences seasonal variations, experts stress the current level of degradation is unprecedented.<\/p>\n\n\n\n

Suraswadi tells Dialogue Earth that researchers are working to establish what is causing the seagrass die-off. A key theory points to the prolonged exposure of intertidal seagrass to air, which is occurring during unusually low tides.<\/p>\n\n\n\n

\u201cData from 2023 shows water levels at low tide are lowered by 20-30cm \u2013 the seagrass gets exposed for a bit longer,\u201d explains Suraswadi. \u201cSeagrasses in deeper zones survive, but then they have grazing pressure from other surviving marine animals that also feed on seagrass.\u201d<\/p>\n\n\n\n

Suraswadi attributes this retreat to natural, recurring variations in oceanic and atmospheric conditions called climate oscillations. The famous El Ni\u00f1o\/La Ni\u00f1a system is one of these, but there are several others<\/a>. It is not yet clear what exact oscillation may have caused the recent low tides, but, combined with higher-than-normal air temperatures, some experts think this change could have driven Thailand\u2019s seagrass into trouble.<\/p>\n\n\n\n

\"A<\/div>
The Seaweed and Seagrass Research Unit at the Prince of Songkla University, southern Thailand, is investigating the causes of the area\u2019s mass seagrass die-offs \u2013 and possible solutions (Image: Siripannee Supratya)<\/div><\/div><\/div><\/div>\n\n\n\n

\u201cThese past few years, low-tide marks have been dropping lower, exposing seagrass to extreme temperatures for longer periods,\u201d says Suraswadi. \u201cThis has made us realise we need more expertise in physical oceanography [to fully understand the impact on marine ecosystems].\u201d<\/p>\n\n\n\n

Disappearing meadows<\/h2>\n\n\n\n

In Trang province, the Libong Archipelago Wildlife Reserve and the Hat Chao Mai National Park were once known for their vast seagrass beds and thriving marine life \u2013 including the chance to spot a dugong. By 2024, these previously rich undersea meadows of green blades had turned into barren landscapes of blackened stubs.<\/p>\n\n\n\n

\u201cWe still don\u2019t know the major factor that is influencing this massive die-off,\u201d says Stankovic. She thinks it is not entirely human-caused, and the extent to which climate change and other anthropogenic factors are accelerating it remains unclear.<\/p>\n\n\n\n

\u201cAs far as we know, Phuket is potentially the only place left with seagrass. I don\u2019t think it will be sustainable for the number of dugongs that migrated there,\u201d she adds. \u201cBut also, there is a lack of discussion on what\u2019s happening to other species, like fish, crabs and seahorses that live and use seagrass beds as a nursery.\u201d<\/p>\n\n\n\n

Save the dugong<\/h2>\n\n\n\n

As researchers attempt to understand the seagrass die-off, efforts are underway to save Thailand\u2019s remaining dugong population. In November 2024, the DMCR drafted a four-part emergency response plan: identify remaining dugong numbers; determine new migration routes; restore seagrass habitats; and consider other solutions, such as temporary feeding shelters. The DMCR has been studying what aquariums abroad feed captive dugongs and manatees.<\/p>\n\n\n\n

Also in November, the DMCR began feeding<\/a> leafy vegetables (such as Chinese kale, water spinach and Chinese cabbage) to dugongs around Phuket, as a stopgap until their seagrass can be restored. But an adult dugong eats up to 30 kilograms of seagrass daily, so a sustainable, long-term solution hinges on reviving the seagrass itself. <\/p>\n\n\n\n

Laddawan Sangsawang, who has overseen small-scale seagrass restoration for the DMCR, warns that previous restoration efforts have proved challenging:<\/p>\n\n\n\n

\u201cWe only tried with a few species. For example, with Enhalus acoroides<\/em> [one of 13 seagrass species found in Thailand], we would choose a patch of land that originally had the species growing. With smaller Halodule<\/em>, sometimes, without proper techniques, the shoots float away or get eaten by marine animals.\u201d<\/p>\n\n\n\n

Seasonal dynamics are also not yet fully understood, says Sangsawang. She adds that, in some areas, restoration work overlaps with local fishing for shellfish that uses rakes, which can damage the grass.<\/p>\n\n\n\n

If dugongs are to survive in Thailand\u2019s waters, the loss of their habitat must be reversed. Scientists emphasise that without a deeper understanding of the causes behind this ecological collapse, restoration efforts may fall short of providing a viable future for the species.<\/p>\n","protected":false},"excerpt":{"rendered":"

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