Medwet.Mind and lUCN Mediterrancan

Mediterranean - TESSA: A tool to assess the benefits of nature

Wetlands are found all over the world and include ecosystems such as swamps, marshes, lakes, lagoons, mangroves, coral reefs, and peatlands. To some up just a few of their benefits: they purify and store water, they reduce the impact of floods and coastal erosion, and they provide habitats for wildlife and plants. They are particularly important in Mediterranean coastal areas: they occupy approximately 2% of the total surface of the Mediterranean while hosting more than 30% of the basin’s vertebrate species.

Unfortunately, these precious coastal ecosystems are one of the most threatened on the planet. In the Mediterranean, 48% of wetlands have been destroyed in the last 50 years and 36% of wetland-dependent species threatened by extinction. This is mainly due to drainage, land conversion along coastal development and agricultural water abstraction. Healthy wetlands are important carbon sinks as they store and sequester carbon and prevent it from being released in the atmosphere. But when coastal wetlands are degraded or converted, they emit greenhouse gases, accelerating the climate crisis. Therefore, it is of utmost importance to preserve, restore, and protect these unique ecosystems as they have countless benefits for wildlife and people alike.  

A tool to assess nature’s benefits

As wetlands are crucial to fight the climate and biodiversity emergencies, we must improve their land use and natural resources management. For this, decision-makers, notably policy-makers, need to be informed about the assets and benefits nature provides to people. Therefore TESSA, the Toolkit for Ecosystem Service Site-based Assessment was created. TESSA provides wetland managers, conservation practitioners, and the private sector with a step-by-step guidance on practical methods to assess and value these crucial benefits (ecosystem services) at a site as well as how to present and communicate on these results to influence decision-making. The methods and approaches presented in this toolkit have been thoroughly tested in different contexts and countries of the world.  

TESSA in practice

BirdLife International supported project partners to apply TESSA at three Mediterranean coastal wetlands in Montenegro (Ulcinj Salina), Sardinia (Oristano), and Tunisia (Ghar El Melh). The goal was to assess the ecosystem services and value their benefits at each of these key sites, designated as Important Bird and Biodiversity Areas (IBAs) and Key Biodiversity Areas (KBAs). This enabled our collaborative Partners CZIP (Montenegro), MEDSEA (Sardinia) and AAO (Tunisia) to inform policy makers and provide first recommendations. For example, in Montenegro the results were considered for the development of a management plan for Ulcinj salina, and in Sardinia the economic assessment at a site along with qualitative assessment at other Sardinian sites served as pilots to inform decision-makers in the relevant setting of the Maristanis Coastal Wetland Contract (MCWC) and will be added in the official documents for the future regional park of the Maristanis Wetlands.  

Understanding the benefits of Mediterranean wetlands is crucial, as one third of the Mediterranean population lives by the coast. According to Moujib Gabous, the Project Coordinator of Association “Les Amis des Oiseaux” (AAO/BirdLife Tunisia) : “We have used TESSA to assess the ecosystem services of the site and to better understand how to increase the benefits through sustainable development. These results helped raise awareness among the local population and is currently helping decision-makers to make sustainable choices for the future of the lagoon of Ghar El Melh.”

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