23 July, 2024


The Value Of Mangroves: Ecological Services Of Mangroves In Sri Lanka

By Buddhika Ranadheera

Buddhika Ranadheera

Mangroves are a valuable ecological and economic resource to Sri Lanka. According to the Forest Department, Sri Lanka is home to over 20 mangrove species which extend over an area of 15,670 hectares. However, mangroves represent only 0.2% of the total forest cover. 

Mangroves and the Economy

The coastal, inland, and offshore fisheries contributed 1.3% of the GDP of Sri Lanka in 2017. However, there has been a decline in coastal fishery production by 5.3% while inland aquaculture, shrimp, and prawn production declined by 7.9 % and 23.4 % compared to 2016. Mangrove depletion is considered as being among the reasons for this depletion, indicating that the survival and healthy growth of mangroves is a crucial component to the sustainability of the fishing industry.

Mangroves in Sri Lanka provide wood and timber for housing, firewood, and charcoal to coastal households. Almost 75% of the coastal population extracts firewood from mangrove forests. The coastal community also depends on mangroves for bottle caps and ornamental production. 

Ecological Services 

Mangroves are pivotal coastal ecosystems and play a key role in weathering climate change impacts such as storms, hurricanes, and tsunamis while mitigating its causes. The value of mangroves in carbon sequestration is higher than terrestrial forests. Mangrove forests absorb up to four times more carbon per hectare than other tropical forests. This unique ecosystem also provides a nursery habitat for many wildlife species, including commercial fish and crustaceans, and contributes to sustaining the local abundance of fish and shellfish populations. Mangroves also provide shelter and feeding grounds for many reptiles and nesting grounds for local and migratory birds.  

Further, mangroves facilitate the growth of corals and provide shelter for coral species at risk of extinction from coral bleaching. Coral bleaching is one of the calamitous effects of climate change, and it is worsened by the absorption of more carbon by the oceans. Several species such as seagrass beds cannot survive without mangroves, and it is vital to ensure that mangroves are protected as they can withstand sea level rise and help mitigate coastal erosion. 

Climate Change Impacts on Mangroves 

A large percentage of mangrove populations in Sri Lanka have been subjected to depletion and deforestation as a result of anthropogenic activities as well as natural disasters. They have been threatened by natural disasters while functioning as a buffer and protecting the coast. During the 2004 Tsunami, most of the mangroves along the Southern belt were destroyed. With the intensity of climate change and natural perils rising, more and more mangroves are destroyed and the time needed for recovery gets extended. 

The Human Threat

Human settlements in the coastal areas threaten mangroves. With one third of the population in Sri Lanka living along the coastal belt, and human settlements in the coastal areas of Sri Lanka ever expanding, the waste disposals of these human settlements cause a significant threat to coastal ecosystems such as mangroves. Even though mangroves are resilient to disturbances, the pollutants cause considerable damage to them. 

Mangroves are highly threatened by the unprecedented and unhealthy growth of the tourism sector. They are being deforested to build tourist resorts and infrastructure as well as to have a better view of the ocean. The roots, fruits, and flowers of particular species of mangroves are also being used to create ornaments and lids at unsustainable levels. 

There has been indiscriminate exploitation of mangroves for commercial purposes including deforestation of mangroves to build salt beds, aquaculture ponds, and prawn farms. With increasing consumer demand for shrimps and the expansion of export-oriented prawn farming, more mangrove forests have been lost. 

The civil war has also contributed to the destruction of mangroves in the North and the North East of Sri Lanka, which is further impacting the economy of the communities dependent on the ecosystem for their livelihood. 

Conventions, Mandates, and Legal Protection 

At the international level, the most widespread convention for the protection of mangroves is the Convention on Wetlands or the Ramsar Convention of 1975. Sri Lanka is Party to this convention which came into effect in 1990 and has 6 Ramsar sites. 

The mission of the Convention is the “conservation and wise use of all wetlands through local and national actions and international cooperation, as a contribution towards achieving sustainable development throughout the world. […] [T]he Contracting Parties commit to work towards the wise use of all their wetlands; designate suitable wetlands for the list of Wetlands of International Importance (the “Ramsar List”) and ensure their effective management; and cooperate internationally on transboundary wetlands, shared wetland systems and shared species.”

At the national level, the legal mandate to protect mangroves falls under the Coast Conservation Department, the Forest Department, and the Department of Wildlife Conservation. However, there are gaps and constraints in the law enforcement against encroachers of marshlands due to legal limitations, and conflicts in existing laws.  The need to address these conflicts and limitations have been highlighted by many stakeholders. 

Recognising the impacts of climate change on mangroves, Sri Lanka’s Nationally Determined Contributions, which are commitments under the Paris Agreement to address climate change, include the restoration of mangroves as a climate action to build resilience under the coastal conservation sector. The National Adaptation Plan of Sri Lanka also focuses on mangroves under Sri Lanka’s climate actions. 

Rehabilitating Mangroves

The reforestation of mangroves native to the reforestation location is essential to avoid an ecological imbalance. Research shows that in the restoration efforts conducted in Sri Lanka, approximately 200-220ha out of 1,000-1,200ha have showed successful restoration. 

While the conservation efforts of the Sri Lanka Mangrove Conservation Project run by the Ministry of Mahaweli Development and Environment with assistance from the US Seacology Institute is commendable, Sri Lanka needs an appropriate all-island restoration programme that involves the local communities whose livelihoods are dependent on mangroves and who better understand the interdependence between this ecosystem and their lives. 

It is important to consider that women are key stakeholders (which is the case in the Sri Lanka Mangrove Conservation Project) at the national as well as sub-national level in initiatives focusing on mangroves. Youth involvement in the restoration process is also essential, as the future and sustainability of this valuable ecosystem depends on the stakeholders involvement of stakeholders and their commitment to pursue restoration activities.

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Latest comments

  • 5

    Well written article; the writer put the benefits of mangrove development and protection so beautifully.
    Now; CT becomes a journal of all things from politics to agriculture .
    Well done .
    In Sri Lanka we talk too much do little to protect our nature .
    Sri Lankan beauty is destroyed not by animals but human animals

    • 1

      Lankan; I agree
      “Sri Lankan beauty is destroyed not by animals but human animals” …
      And they call it ‘Development’!

      Our main Source of Income is Tourism – Tourists come to Places like Sri Lanka, to see and enjoy her Natural Beauty, which has been lost in their Own Countries, due to so called ‘Development’!

  • 2

    Love your article, love your thoughts
    Good choice of words which go deep
    Your contribution to save mangrove trees
    I hope would receive support countrywide
    Mangroves are a nature’s gift to us
    Tangled roots are a fascination to my eyes
    Salt tolerant, they grow in the coastline
    To save the ecosystem, restoration is crucial
    Some animals are sheltered in mangroves
    Breeding and feeding grounds for fish n birds
    As you said in the article, Buddhika
    The roots of mangroves buffer our shores
    Some people tend to encroach on wetlands
    I believe not knowing their boundaries
    Sale of lands in wetlands should stop
    Concerted efforts are the key for preservation
    Human livelihood needs should be limited
    Awareness campaigns will be helpful
    Mangrove wetlands need to demarcate
    Poaching and farming should be prohibited
    Re-planting mangroves islandwide
    Is necessary to minimize climatic changes
    I think Navy had done some work
    Please, use mixed species than single ones

  • 0

    Thank you Buddhika Ranadheera for reminding us of the damage to eco-system when mangroves are destroyed to make way for commercial enterprises like prawn farming. We cannot afford to be lethargic. This should be treated as a political issue. Politicians will not touch – the business lobby is far too strong.

    • 0

      Buddhika raised an issue which will have long term effect. On 31 July, Grusha Andrews in “Carcinogenic Kumar: Thanks, But No Thanks” raised a similar issue – promotion of unhealthy food through advertising. There were 142 comments. How come? Because the name of a celebrity was in the article!
      PS: Not implied that Grusha did it deliberately.

  • 0

    Yes, wonderful article by Buddhika Ranadheera. Thanks! The key element is the support for livelihoods that protects the mangroves. Celebrities should put their money into these ventures if they want to enter politics. Being voted into political office should be based around “good-deeds” rather than garnering quick money through worthless advertising.

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