Marismas Project in Marismas Nacionales
August 24, 2020

The Marismas Nacionales (MN) is located on the Pacific coast of Mexico south of Mazatlan and north of Puerto Vallarta in the states of Sinaloa and Nayarit. It extends 240 km from north to south encompassing 513,000 ha, including 113,000 ha of mangroves. It is the largest single expanse of mangroves on the Pacific coast of Mexico and all of the Americas and accounts for 20% of the mangrove area in Mexico. The highly productive MN provides a myriad of ecosystem services, including nursery and spawning habitat for numerous species of fish and shellfish that support a valuable fishery; important overwintering habitat for migratory birds; and food, material, and income for people that live in the area.

Despite its ecological importance and designation as a RAMSAR site and UNESCO biosphere reserve, the MN has lacked specific conservation strategies. Large tracts of the MN mangrove ecosystems have been eliminated or altered by development for agriculture, conversion to shrimp farms, construction of the Cuautla channel, and deforestation for construction and firewood. In a study of changes in mangrove extent in Mexico, the southern half of the MN in Nayarit lost more than 10,000 ha alone between 1970 and 2005, the largest loss of mangroves in northwestern Mexico. The opening of the estuary created by the Cuautla channel in the early 1970s greatly increased saltwater intrusion. That coupled with dam construction and flow reductions of the freshwater tributaries have resulted in hypersalinity and mangrove mortality.

EcoWB with partners in Mexico (Pronatura Noroeste and Environmental Resources Management Corp. [ ERM ]) and with funding from the ERM Foundation are involved in efforts to restore and protect the mangrove forests in the MN.

The overall project comprises two related objectives:

Successful accomplishment of both of these objectives requires a sound ecological and social basis. Without an understanding of the natural processes and anthropogenic factors influencing the health of the MN, it is exceedingly difficult to determine which actions should be implemented to prevent further degradation and promote ecosystem recovery. Current work is focused on preparing a proposal for a bio-physical-social assessment of the MN to provide that basis.

Managing the Mangroves of Jiquilisco Bay: Science, Collaboration, and Community

November 5, 2025
Since 2023 EcoWB has been contributing its technical expertise to a multi-phase restoration initiative led by Asociación Mangle and the Mangrove Action Project in El Salvador’s Jiquilisco Bay, one of Central America’s largest and most diverse mangrove ecosystems. Together, these organizations and our technical collaborators aim to conserve, restore, and sustainably manage this globally significant ecosystem that supports biodiversity and local livelihoods. Its mangroves are globally important in sequestering carbon to mitigate the effects of climate change. Jiquilisco Bay, located on the Pacific coast of southeastern El Salvador, is a place of exceptional natural richness and ecological importance. Recognized as both a UNESCO Biosphere Reserve and a Ramsar Wetland of International Importance, it is home to one of Central America’s largest and most diverse mangrove forests, covering more than 20,000 hectares. These mangroves form the heart of the Jiquilisco Bay Biosphere Reserve, which spans around 400 km². It includes a mosaic of bays, channels, sandy beaches, islands, freshwater lagoons, and coastal forests. The reserve stretches along 50 kilometers of coastline between the Lempa River and the Jucuarán mountain range. The mangroves of Jiquilisco Bay—dominated by red, black, white, and buttonwood mangrove species—play a vital role in keeping the coast alive and protected. They reduce erosion, lessen storm impacts, and filter pollutants, acting as natural shields for coastal communities. Beneath their tangled roots, they are habitat for an astonishing variety of life, including fish, crabs, and sea turtles, such as the hawksbill, green, olive ridley, and leatherback, which are at risk of extinction. Above the water line they are vital for birds and other terrestrial animals. Beyond their ecological value, these mangroves are deeply connected to local communities, supporting fisheries, providing food and materials, and sustaining livelihoods. The project’s first phase focused on understanding trends in mangrove distribution and some of the factors influencing their health. Using Landsat satellite data and advanced machine learning techniques, EcoWB helped develop high-resolution maps of mangrove cover spanning three decades. This analysis identified key influences on mangrove viability, such as proximity to agriculture, urban expansion, elevation, soil conditions, and temperature. Building on that foundation, EcoWB supported a detailed assessment of mangrove cover changes and corresponding health and analysis of canopy height and aboveground biomass during a ten-year period (2016–2025) using Sentinel satellite and LiDAR data. The height and biomass (plant material) can be related to health, age, species composition, and site characteristics. The study underscored the need for continued protection, hydrological restoration, and community stewardship to strengthen ecosystem resilience. EcoWB is now helping translate that information into action through the creation of an open-source, interactive web platform. This tool will enable Asociación Mangle, the Mangrove Action Project, NGOs, government agencies, and local communities to visualize mangrove health trends and help identify priority conservation and restoration areas. Through knowledge transfer, EcoWB and its partners aim to empower local communities to make informed, science-based decisions for the long-term management of Jiquilisco Bay. This initiative demonstrates how collaboration, innovation, and community leadership can come together to safeguard one of Central America’s most vital coastal ecosystems. By combining cutting-edge science with local knowledge, EcoWB and its partners are helping ensure that Jiquilisco Bay’s mangroves—and the communities that depend on them—continue to thrive for generations to come. 

Supporting Those in Need During Uncertain Times

By Becky Muston • June 4, 2025
As a volunteer-supported ecological assistance organization, EcoWB contributes to the vital work of the international aid community—supporting humanitarian and conservation efforts where ecological expertise can make a meaningful difference. In recent months, critical funding and staffing for international aid once provided through U.S. government programs have been withdrawn. The effects are already visible: environmental and humanitarian programs paused, local teams let go, and progress at risk of stalling. Among the efforts most affected are those tackling biodiversity loss, habitat degradation, water pollution, and climate change—areas where EcoWB has long provided professional expertise and hands-on project support. In response, we’re actively looking for opportunities to support projects that need ecological guidance or technical capacity to keep going. With our global network of skilled volunteers, we’re well placed to step in where others no longer can. If you know of places, partners, or organizations where environmental needs are going unmet—or if you're looking to make a meaningful impact— we’d love to hear from you . We also encourage those with the means to do so to take a moment: research the organizations struggling on the frontlines, see where funding may have been cut, and consider offering your support. Now more than ever, action matters—whether it’s donating, volunteering, or simply amplifying the work that still needs doing.