Wetlands
Wetlands
Wetlands are ecosystems in which water saturation is a dominant factor shaping soils, vegetation, hydrology, and biological communities. They occur where terrestrial and aquatic environments meet and include marshes, swamps, bogs, fens, mangroves, salt marshes, wet meadows, prairie potholes, floodplains, and other water-dependent habitats.
Although wetlands differ greatly in climate, vegetation, salinity, geography, and hydrology, they perform many of the same fundamental ecological functions. They provide habitat for diverse plants and animals, store and filter water, influence nutrient cycles, reduce some flood and storm impacts, stabilize shorelines, and store carbon. These functions also make wetlands important to fisheries, agriculture, recreation, water supplies, local economies, and human communities.
Wetlands have nevertheless been extensively altered or destroyed through drainage, development, pollution, changes in hydrology, agriculture, invasive species, resource extraction, and climate change. Conservation and restoration therefore increasingly combine ecological science, hydrological management, monitoring, mapping, public policy, land protection, and international cooperation.
Wetland Types and Ecology
Wetlands are generally defined by the interaction of water, soils, and vegetation. The amount, timing, depth, duration, and source of water can determine what kind of wetland develops and which organisms can survive there.
Marshes are commonly dominated by grasses, reeds, sedges, and other herbaceous plants, while swamps contain substantial woody vegetation such as trees and shrubs. Bogs and fens are peat-forming wetlands. Bogs tend to be acidic and strongly influenced by precipitation, whereas fens receive groundwater and generally have greater access to dissolved minerals.
Coastal wetlands include tidal marshes and mangrove forests. Mangroves consist of salt-tolerant trees and shrubs adapted to tropical and subtropical shorelines. Salt marshes occupy protected coastal areas where salt-tolerant grasses and other plants grow in periodically flooded soils.
Floodplain wetlands, wet meadows, prairie potholes, seasonal wetlands, and other freshwater systems demonstrate the enormous variety of wetland environments. Despite their differences, hydrology remains one of the principal forces controlling their ecological structure and function.
Biodiversity and Wildlife
Wetlands support exceptionally diverse biological communities. They provide breeding, feeding, nursery, resting, migration, and wintering habitat for fish, amphibians, reptiles, birds, mammals, invertebrates, and plants.
Migratory birds are particularly dependent on networks of wetlands. Marshes, estuaries, floodplains, lakes, coastal wetlands, and seasonal wetlands can serve as critical stopping points along migration routes. Waterfowl conservation programs therefore frequently concentrate on protecting and restoring wetland landscapes.
Many amphibians depend on ponds, marshes, temporary wetlands, and other shallow aquatic habitats for reproduction and development. Coastal wetlands are also important nursery and feeding areas for fish and shellfish and can contribute directly to commercial and recreational fisheries.
Because wetlands connect terrestrial and aquatic ecosystems, their degradation can affect biological communities far beyond the boundaries of the wetland itself.
Water Quality, Hydrology and Flood Protection
Wetlands are integral components of watersheds. They can temporarily store runoff, trap sediments, absorb or transform nutrients, and influence the movement of pollutants through landscapes. Vegetation, soils, microorganisms, and hydrological processes work together to alter the chemistry and movement of water.
These natural processes have inspired constructed and treatment wetlands designed to improve wastewater and stormwater quality.
Wetlands can also temporarily retain floodwaters and slow the movement of water downstream. Coastal wetlands can absorb wave energy, reduce erosion, and provide some protection from storms and flooding. Their effectiveness varies with wetland condition, elevation, vegetation, storm characteristics, surrounding topography, and other environmental factors.
Floodplains and river wetlands are especially dependent on connections between rivers and surrounding landscapes. Levees, drainage systems, development, dams, roads, and other infrastructure can alter these connections, while restoration projects often attempt to re-establish more natural hydrological processes.
Wetlands, Carbon and Climate Change
Wetlands play an important role in the global carbon cycle. Waterlogged soils can slow decomposition and allow organic carbon to accumulate for long periods.
Peatlands are particularly important carbon reservoirs. When peatlands are drained, burned, or otherwise degraded, carbon accumulated over long periods can be released into the atmosphere.
Mangroves and salt marshes are major components of coastal "blue carbon" systems. They capture carbon through biological production and store substantial amounts in vegetation, soils, and sediments.
Climate change simultaneously threatens wetlands. Sea-level rise, changing precipitation, drought, warming, saltwater intrusion, erosion, stronger coastal hazards, and changes in hydrology can transform wetland ecosystems.
Some coastal wetlands may respond to rising seas by accumulating sediment or migrating inland. Their ability to do so depends on elevation, sediment supply, hydrology, rates of sea-level rise, and whether undeveloped upland areas remain available for migration.
Protecting and restoring wetlands is therefore increasingly considered part of climate mitigation, climate adaptation, coastal resilience, and nature-based approaches to environmental management.
Wetland Loss and Environmental Threats
Wetlands have been extensively lost or degraded around the world. Major pressures include drainage, conversion to agriculture, urban and industrial development, pollution, altered river flows, invasive species, resource extraction, coastal development, erosion, and climate change.
Loss of wetlands can reduce wildlife habitat, water-storage capacity, natural water purification, shoreline protection, fisheries productivity, carbon storage, and other ecosystem services.
Peatland degradation is particularly significant because drainage and fire can convert long-term carbon stores into sources of greenhouse-gas emissions.
Coastal wetlands face additional pressures from sea-level rise and development. When seawalls, roads, buildings, and other infrastructure prevent wetlands from migrating inland, coastal habitats can become trapped between rising water and developed land.
Wetland Restoration
Wetland restoration seeks to recover ecological processes and functions that have been damaged or lost. Restoration may involve re-establishing natural hydrology, reconnecting floodplains, restoring tidal exchange, rebuilding marsh elevation, removing barriers, controlling invasive species, reintroducing native vegetation, or protecting surrounding landscapes.
Restoration, rehabilitation, establishment, creation, enhancement, and protection describe different approaches to wetland management. Restoring the processes that sustain an ecosystem is generally more complex than simply recreating its visible vegetation.
Research shows that restored wetlands may resemble natural wetlands while still differing in food webs, hydrology, sediment processes, carbon cycling, or other ecological functions. Long-term monitoring is therefore important for determining whether restoration has actually recovered the intended ecosystem processes.
Recent projects include rebuilding coastal marshes with sediment, reconnecting river floodplains, restoring wet meadows, improving tidal circulation, establishing living shorelines, and restoring mangrove forests.
Monitoring, Mapping and Remote Sensing
Effective conservation requires knowing where wetlands occur, how their condition is changing, and whether restoration projects are succeeding.
Wetland inventories, field surveys, ecological indicators, satellite observations, aerial imagery, elevation data, hydrological measurements, and geographic information systems are increasingly combined to monitor wetlands at local, regional, national, and global scales.
Remote sensing can track changes in surface water, vegetation, coastlines, inundation, wetland extent, and land cover. Long-term satellite records are especially useful for detecting gradual environmental changes that may be difficult to recognize through individual field observations.
Monitoring programs can evaluate biological, chemical, physical, and landscape indicators and help governments and conservation organizations determine where protection or restoration is most urgently needed.
Wetlands, People and Ecosystem Services
Wetlands provide numerous benefits to human societies. These include water purification, fisheries, floodwater storage, shoreline stabilization, recreation, tourism, wildlife habitat, carbon storage, food production, cultural values, and support for local livelihoods.
These benefits are often described as ecosystem services or forms of natural capital. Their economic importance becomes particularly visible when wetland loss requires communities to replace natural functions with engineered infrastructure or when environmental degradation increases flood damage, water-treatment costs, fisheries losses, or other expenses.
Wetland conservation is therefore not solely a wildlife issue. It is closely connected with water security, disaster-risk reduction, climate resilience, economic development, agriculture, infrastructure, and public well-being.
Conservation, Policy and International Cooperation
Wetland conservation operates through protected areas, conservation easements, restoration grants, habitat programs, environmental regulations, scientific monitoring, voluntary landowner programs, and international agreements.
In the United States, wetland conservation involves agencies including the Environmental Protection Agency, U.S. Fish and Wildlife Service, U.S. Geological Survey, National Oceanic and Atmospheric Administration, Natural Resources Conservation Service, and U.S. Army Corps of Engineers. Programs address mapping, regulation, restoration, migratory-bird habitat, agricultural conservation, water quality, coastal resilience, and scientific research.
Internationally, the Convention on Wetlands provides a major framework for conserving wetlands and promoting their "wise use." International conservation efforts increasingly connect wetland protection with biodiversity goals, climate policy, sustainable development, freshwater management, and disaster-risk reduction.
Global assessments continue to document substantial wetland degradation while emphasizing the ecological and economic value of conserving remaining wetlands and restoring degraded systems.
The Future of Wetlands
The future of wetlands depends on maintaining the ecological processes that allow these ecosystems to function. Protection of existing wetlands remains important because even well-designed restoration projects may not completely reproduce the complexity of natural ecosystems.
At the same time, restoration can recover important habitat, hydrological connections, water-quality functions, carbon storage, and resilience in degraded landscapes.
Scientific advances in remote sensing, ecological monitoring, hydrological modeling, restoration ecology, carbon measurement, and climate forecasting are improving the ability to understand and manage wetlands. Research increasingly emphasizes that wetlands must be considered as parts of larger watersheds, coastlines, migration networks, and human landscapes rather than as isolated patches of habitat.
Conclusion
Wetlands are among the most ecologically productive and socially valuable ecosystems on Earth. From peatlands and freshwater marshes to mangrove forests, floodplains, salt marshes, and wet meadows, they connect land and water while supporting biodiversity and regulating important environmental processes.
Their benefits include wildlife habitat, water purification, floodwater storage, fisheries production, shoreline protection, nutrient cycling, carbon storage, climate resilience, recreation, and support for human livelihoods. Yet wetlands remain vulnerable to development, drainage, pollution, hydrological alteration, invasive species, and climate change.
Long-term wetland conservation therefore requires a combination of protection, restoration, scientific research, monitoring, sustainable land and water management, public investment, and international cooperation. Protecting wetlands is not simply an effort to preserve individual habitats; it is part of maintaining the water, biodiversity, climate, and ecological systems upon which human societies also depend.
Wetland Fundamentals and Ecology
| U.S. Geological Survey | USGS | 2026
Wetlands are transitional ecosystems where water saturation strongly influences soils, vegetation, and ecological communities, encompassing marshes, swamps, bogs, mangroves, wet prairies, prairie potholes, and vernal pools.
| U.S. Environmental Protection Agency | EPA | 2026
An overview of wetland extent, condition, ecological importance, and environmental trends, emphasizing their roles in biodiversity, flood control, erosion prevention, water purification, and nutrient cycling.
| U.S. Environmental Protection Agency | EPA | 2026
A collection of wetland resources addressing restoration, flooding, wildlife conservation, environmental threats, regulation, and the relationship between wetlands and surrounding watersheds.
| U.S. Environmental Protection Agency | EPA | 2025
A broad collection of educational resources covering wetland types, ecological functions, economic benefits, threats, restoration, monitoring, watersheds, runoff, and conservation.
| U.S. Fish and Wildlife Service | USFWS | 2022
Explains why wetlands are important for wildlife, people, water quality, flood protection, recreation, and maintaining healthy landscapes.
| U.S. Fish and Wildlife Service | USFWS | n.d.
The National Wetlands Inventory provides maps, datasets, and scientific information describing the distribution and characteristics of wetlands throughout the United States.
| National Park Service | NPS | n.d.
Introduces wetland ecosystems protected within national parks and explains their importance for wildlife habitat, hydrology, biodiversity, and environmental quality.
| Convention on Wetlands | Ramsar Convention | n.d.
Describes the international effort to conserve wetlands and promote their wise use through national action and international cooperation.
| Convention on Wetlands | Ramsar Convention | n.d.
Explains the global importance of wetlands for freshwater supplies, biodiversity, climate regulation, livelihoods, food production, and disaster-risk reduction.
| Encyclopaedia Britannica Editors | Encyclopaedia Britannica | n.d.
Provides an introduction to wetlands, their physical characteristics, major classifications, vegetation, hydrology, ecological processes, and geographic distribution.
Types of Wetlands
| U.S. Environmental Protection Agency | EPA | n.d.
Describes major wetland categories including marshes, swamps, bogs, and fens and explains how hydrology, vegetation, soils, and geography distinguish them.
| U.S. Geological Survey | USGS | n.d.
Explains the ecological differences between marshes and swamps, particularly the types of vegetation dominating each wetland environment.
| National Geographic Society | National Geographic Education | n.d.
Introduces the major forms of wetlands and explains how water, soil, vegetation, wildlife, and climate interact within these ecosystems.
| Encyclopaedia Britannica Editors | Encyclopaedia Britannica | n.d.
Examines marsh ecosystems, which are generally dominated by grasses, reeds, sedges, and other herbaceous vegetation adapted to saturated soils.
| Encyclopaedia Britannica Editors | Encyclopaedia Britannica | n.d.
Describes swamps as forested or shrub-dominated wetlands and discusses their hydrology, vegetation, distribution, and ecological significance.
| Encyclopaedia Britannica Editors | Encyclopaedia Britannica | n.d.
Explains bog formation, acidic conditions, peat accumulation, characteristic vegetation, and the distinctive hydrology of these wetlands.
| Encyclopaedia Britannica Editors | Encyclopaedia Britannica | n.d.
Describes fens as groundwater-fed peatlands that generally receive more mineral nutrients than rain-fed bog ecosystems.
| U.S. Forest Service | USDA Forest Service | n.d.
Explains fen ecology and the importance of groundwater-fed peat-forming wetlands for specialized plants and other organisms.
| Australian Government | DCCEEW | n.d.
Examines mangroves and saltmarshes as coastal wetlands that support fisheries, filter sediments and nutrients, store carbon, reduce erosion, and provide wildlife habitat.
| National Ocean Service | NOAA | n.d.
Explains salt-marsh ecosystems and their importance as highly productive coastal habitats positioned between terrestrial and marine environments.
Coastal Wetlands and Mangroves
| NOAA Fisheries | NOAA | 2026
Describes coastal wetlands as important habitats that filter pollutants, store floodwaters, support fisheries, reduce storm impacts, and capture significant quantities of blue carbon.
| Various Authors | Annual Review of Marine Science | 2023
Reviews the effectiveness and limitations of tidal marshes and mangroves as natural defenses against waves, erosion, flooding, storms, and other coastal hazards.
| Various Authors | Nature Climate Change | 2022
Scientific research examines the potential of coastal wetland conservation and restoration to contribute to climate-change mitigation.
| National Ocean Service | NOAA | n.d.
Explains how mangroves, salt marshes, and seagrass ecosystems capture atmospheric carbon and store it in vegetation and sediments.
| National Ocean Service | NOAA | n.d.
Introduces mangrove forests and explains their importance for shoreline protection, fisheries, wildlife, and tropical coastal ecosystems.
| NOAA Fisheries | NOAA | n.d.
Examines the role mangrove ecosystems can play in helping coastal communities and wildlife adapt to storms, erosion, sea-level rise, and climate change.
| United Nations Environment Programme | UNEP | n.d.
Discusses international efforts to conserve and restore mangroves, salt marshes, seagrasses, and other blue-carbon ecosystems.
| World Wildlife Fund | WWF | n.d.
Describes mangrove ecosystems, their biodiversity, ecological services, threats, and importance to coastal communities.
| International Union for Conservation of Nature | IUCN | n.d.
Examines the relationship between mangrove conservation and climate mitigation and adaptation.
| Wetlands International | Wetlands International | n.d.
Examines conservation and restoration of coastal wetlands and deltas as strategies for supporting biodiversity and resilient human communities.
Wetlands and Biodiversity
| BirdLife International | BirdLife International | 2022
Explains the close relationship between healthy wetland ecosystems, bird populations, biodiversity, and human well-being.
| U.S. Environmental Protection Agency | EPA | n.d.
Describes wetlands as important habitats for plants, fish, amphibians, birds, mammals, and numerous other organisms.
| U.S. Fish and Wildlife Service | USFWS | n.d.
Provides information about wetland habitats and the ecological characteristics used to identify and map them.
| National Audubon Society | Audubon | n.d.
Discusses the importance of wetlands as breeding, feeding, resting, and migration habitats for birds.
| World Wildlife Fund | WWF | n.d.
Examines freshwater habitats, including wetlands, and the extraordinary biodiversity dependent upon healthy freshwater ecosystems.
| International Union for Conservation of Nature | IUCN | n.d.
Discusses conservation of freshwater biodiversity and ecosystems, including wetlands, rivers, lakes, and groundwater-dependent environments.
| Various Authors | Nature Portfolio | Nature | n.d.
A research collection covering wetland ecology, biodiversity, hydrology, carbon cycling, environmental change, restoration, and conservation.
| Various Authors | Frontiers in Environmental Science | Frontiers | n.d.
Scientific research explores wetland ecology, management, environmental pressures, ecosystem services, and restoration.
| Various Authors | ScienceDirect | Elsevier | n.d.
Provides scholarly overviews and research relating to wetland ecosystems, hydrology, vegetation, biodiversity, and environmental management.
Wetlands and Water Quality
| U.S. Environmental Protection Agency | EPA | n.d.
Explains how wetlands can improve water quality by trapping sediments, absorbing nutrients, processing pollutants, and slowing runoff.
| U.S. Geological Survey | USGS | n.d.
Examines relationships among wetlands, hydrology, water quality, habitat, and aquatic ecosystems.
| U.S. Environmental Protection Agency | EPA | n.d.
Explains how constructed wetlands use vegetation, soils, microorganisms, and natural processes to remove contaminants from water.
| U.S. Environmental Protection Agency | EPA | n.d.
Describes engineered wetland systems designed to mimic natural purification processes for wastewater and stormwater treatment.
| U.S. Geological Survey | USGS | n.d.
Provides scientific background on nutrient pollution and eutrophication, processes in which wetlands can play important filtering and nutrient-processing roles.
| Natural Resources Conservation Service | USDA | n.d.
Discusses water conservation, water quality, runoff, erosion, and natural-resource management practices relevant to wetlands and watersheds.
| U.S. Environmental Protection Agency | EPA | n.d.
Examines the use and protection of wetlands and riparian areas to reduce nonpoint-source water pollution.
| U.S. Environmental Protection Agency | EPA | n.d.
Explains relationships between runoff and wetlands and how wetland ecosystems can influence sediment and pollutant movement.
| U.S. Environmental Protection Agency | EPA | n.d.
Places wetlands within the larger watershed system and explains how wetland health is connected to surrounding land and water management.
Wetlands, Flooding, and Storm Protection
| U.S. Environmental Protection Agency | EPA | 2026
Explains how wetlands store floodwater, moderate downstream flooding, protect shorelines, support wildlife, improve water quality, and contribute to economic well-being.
| Various Authors | Scientific Reports | 2020
Scientific research explores relationships among coastal habitats, flooding, storms, and natural hazard reduction.
| Various Authors | Scientific Reports | 2017
Research evaluates the economic value of coastal wetlands in reducing property damage associated with major storms.
| U.S. Geological Survey | USGS | n.d.
Provides scientific information about floods, droughts, hydrology, and landscape processes relevant to floodplain and wetland ecosystems.
| World Bank | World Bank | n.d.
Provides broader information on disaster-risk reduction and nature-based approaches relevant to wetland conservation and flood management.
| U.S. Environmental Protection Agency | EPA | n.d.
Explains green-infrastructure approaches that use vegetation, soils, and natural hydrological processes to manage stormwater and flooding.
| Federal Emergency Management Agency | FEMA | n.d.
Discusses connections between floodplain management, natural habitats, wildlife conservation, and flood-risk reduction.
| National Oceanic and Atmospheric Administration | NOAA | n.d.
Provides educational resources about coastal resilience and natural systems that help communities respond to flooding, storms, erosion, and climate change.
Wetlands and Climate Change
| Kristen Goodhue | Smithsonian Magazine / Smithsonian Environmental Research Center | 2024
Examines the Coastal Carbon Atlas and scientific efforts to measure how much carbon wetlands store around the world.
| Intergovernmental Panel on Climate Change | IPCC | 2022
Assesses climate impacts and adaptation across terrestrial, freshwater, and coastal ecosystems, including wetlands and other water-dependent environments.
| Joseph Stromberg | Smithsonian Magazine | 2013
Describes long-term experiments investigating how tidal marsh vegetation responds to elevated carbon dioxide, environmental change, and pollution.
| U.S. Environmental Protection Agency | EPA | n.d.
Discusses how climate change can alter wetland hydrology, vegetation, wildlife habitat, coastal inundation, and ecosystem functions.
| U.S. Geological Survey | USGS | n.d.
Provides climate-adaptation research relevant to wetlands, wildlife habitats, freshwater systems, and changing landscapes.
| United Nations Environment Programme | UNEP | n.d.
Provides information on climate mitigation, adaptation, ecosystem conservation, and nature-based approaches relevant to wetland protection.
| Wetlands International | Wetlands International | n.d.
Examines the role of wetland conservation and restoration in climate mitigation, adaptation, resilience, and sustainable land management.
| CIFOR-ICRAF | CIFOR-ICRAF | n.d.
Provides research and resources on peatlands, their carbon stocks, degradation, fires, biodiversity, restoration, and climate importance.
| Food and Agriculture Organization | FAO | n.d.
Examines peatland conservation and management in relation to agriculture, land use, greenhouse-gas emissions, and climate change.
Wetland Loss and Threats
| Food and Agriculture Organization | FAO | 2014
Reviews peatland management and restoration as strategies for reducing environmental degradation and greenhouse-gas emissions.
| U.S. Fish and Wildlife Service | USFWS | n.d.
Tracks changes in wetland extent and type and provides important evidence about long-term wetland losses and landscape transformation.
| U.S. Environmental Protection Agency | EPA | n.d.
Examines wetland degradation and approaches for protecting and restoring these ecosystems.
| Convention on Wetlands | Ramsar Convention | n.d.
Discusses worldwide wetland loss and degradation caused by drainage, development, pollution, invasive species, altered hydrology, and climate change.
| Wetlands International | Wetlands International | n.d.
Explains the importance of wetlands and the major pressures causing their degradation and disappearance worldwide.
| World Wildlife Fund | WWF | n.d.
Examines habitat destruction and degradation affecting wetlands and numerous other ecosystems.
| United Nations Environment Programme / Convention on Wetlands | UNEP | n.d.
Reviews the global condition of wetlands and the environmental and social consequences associated with their continued decline.
| International Union for Conservation of Nature | IUCN | n.d.
Explains how peatland drainage and degradation can transform long-term carbon stores into major sources of greenhouse-gas emissions.
| U.S. Geological Survey | USGS | n.d.
Provides research on invasive species, an important ecological pressure affecting many freshwater and wetland ecosystems.
| U.S. Environmental Protection Agency | EPA | n.d.
Examines nutrient pollution, which can alter water chemistry, oxygen levels, plant communities, and ecological conditions in wetlands and connected waters.
Wetland Restoration
| U.S. Environmental Protection Agency | EPA | 2026
Presents guiding principles for restoring wetland ecological integrity, natural structure, hydrology, native species, ecosystem processes, and long-term resilience.
| U.S. Environmental Protection Agency | EPA | 2026
Distinguishes wetland restoration, re-establishment, rehabilitation, creation, and enhancement and explains the ecological objectives behind each approach.
| Sammy L. King et al. | U.S. Geological Survey / Wetlands | 2009
Synthesizes research on southeastern floodplain ecology and restoration, emphasizing hydrology, land use, water quality, climate uncertainty, management, and interdisciplinary conservation.
| Mary E. Kentula | U.S. Geological Survey / EPA | n.d.
Reviews the restoration and creation of wetlands and explains how recovering degraded ecosystems can restore water-quality, wildlife, flood-control, and recreational benefits.
| NOAA Fisheries | NOAA | n.d.
Describes habitat-restoration programs involving wetlands, estuaries, rivers, coastal habitats, fisheries, and degraded aquatic ecosystems.
| Natural Resources Conservation Service | USDA | n.d.
Explains Wetland Reserve Easements used to protect, restore, and enhance wetlands on privately owned lands.
| Ducks Unlimited | Ducks Unlimited | n.d.
Describes wetland conservation and restoration strategies designed particularly to protect waterfowl habitat and associated ecosystems.
| The Nature Conservancy | The Nature Conservancy | n.d.
Describes conservation strategies for protecting and restoring lands and waters, including wetlands and freshwater ecosystems.
| Wetlands International | Wetlands International | n.d.
Describes international wetland-restoration initiatives involving peatlands, floodplains, deltas, mangroves, and other degraded wetland systems.
| Society for Ecological Restoration | SER | n.d.
Provides international principles and standards for ecological restoration applicable to wetlands and other damaged ecosystems.
Wetlands, People, and Ecosystem Services
| U.S. Environmental Protection Agency | EPA | n.d.
Examines economic benefits associated with wetland services including water purification, fisheries, recreation, flood protection, and shoreline stabilization.
| World Bank | World Bank | n.d.
Examines environmental sustainability and natural-capital approaches relevant to the economic and social benefits provided by wetlands.
| United Nations Environment Programme | UNEP | n.d.
Discusses the relationship between ecosystems, natural capital, sustainable economic development, and human well-being.
| Food and Agriculture Organization | FAO | n.d.
Examines integrated management of lagoons and wetland-related environments that support fisheries, food production, biodiversity, and livelihoods.
| Wetlands International | Wetlands International | n.d.
Explains the importance of wetlands for people, water security, biodiversity, climate resilience, livelihoods, and disaster-risk reduction.
| The Nature Conservancy | The Nature Conservancy | n.d.
Describes landscape-scale conservation approaches that encompass freshwater, wetland, coastal, and terrestrial ecosystems.
| International Union for Conservation of Nature | IUCN | n.d.
Explains nature-based solutions that protect and restore ecosystems such as wetlands while addressing societal challenges including climate change and natural hazards.
| TEEB | United Nations Environment Programme | n.d.
Examines the economic value of water and wetland ecosystem services and the costs societies incur when these natural systems are degraded.
Wetland Conservation and Policy
| Convention on Wetlands | Ramsar Convention | n.d.
The international Convention on Wetlands provides the principal global framework for wetland conservation, designation of internationally important wetlands, and promotion of their wise use.
| U.S. Environmental Protection Agency | EPA | n.d.
Provides extensive information on wetland science, conservation, regulation, monitoring, restoration, and Clean Water Act programs.
| U.S. Environmental Protection Agency | EPA | n.d.
Explains Clean Water Act Section 404, which regulates certain discharges of dredged or fill material into waters and wetlands of the United States.
| U.S. Army Corps of Engineers | USACE | n.d.
Describes the federal regulatory and permitting program affecting activities involving wetlands and other waters.
| Natural Resources Conservation Service | USDA | n.d.
Provides information about wetland conservation on agricultural and privately owned landscapes.
| U.S. Fish and Wildlife Service | USFWS | n.d.
Describes conservation programs supporting partnerships to protect and restore wetlands and associated migratory-bird habitats.
| Ducks Unlimited | Ducks Unlimited | n.d.
Provides information about large-scale wetland and waterfowl conservation programs across North America.
| Wetlands International | Wetlands International | n.d.
An international conservation organization focused specifically on protecting and restoring wetlands for people and nature.
| BirdLife International | BirdLife International | n.d.
Examines wetland conservation from the perspective of birds, biodiversity, habitat protection, migratory pathways, and international conservation.
Recent Wetland Research and Restoration
| NOAA Fisheries | NOAA | 2026-03-27
One year after creation of more than 1,100 acres of marsh habitat in Louisiana's Upper Barataria Basin, researchers are finding shrimp, crabs, and other species returning to the restored wetlands.
Reviews the ecological importance of African mangroves, major threats such as development, aquaculture and oil pollution, and opportunities for restoring degraded mangrove ecosystems.
| NOAA Fisheries | NOAA | 2026-03-16
Explores the many ecological functions of marshes, including supporting fisheries and wildlife, filtering pollution, protecting coastlines, and providing recreational opportunities.
| NOAA Fisheries | NOAA | 2026-02-02
Explains five major reasons wetlands matter, including fish and wildlife habitat, storm protection, water filtration, recreation, and economic benefits.
| NOAA Fisheries | NOAA | 2026
Describes habitat conservation programs that reconnect coastal wetlands, restore rivers, rebuild shellfish populations, and rehabilitate other aquatic habitats.
| NOAA Fisheries | NOAA | 2026
Reviews the science behind habitat conservation and restoration, including projects designed to reconnect coastal wetlands and improve fisheries habitat.
Wet Meadows, Fens, and Freshwater Wetlands
Synthesizes research on wet meadows and explains how groundwater, surface water, vegetation, sediment, and biological processes interact to maintain these wetlands.
| Michael M. Pollock & Laura M. Norman | NOAA Repository / Frontiers in Environmental Science | 2025
Examines restoration of wet meadows through recovery of the biological, geomorphic, and hydrological feedbacks that originally maintained them.
| Beth A. Middleton et al. | U.S. Geological Survey / Springer | 2006
Reviews ecological research and management approaches for fens, distinctive peat-forming wetlands dependent heavily on groundwater.
| Beth A. Middleton et al. | U.S. Geological Survey / Springer | 2006
Provides an overview of fen management, biodiversity conservation, ecological functioning, and restoration research.
| Gregory A. Knutsen & Ned H. Euliss | U.S. Geological Survey | 2001
Reviews restoration research from North America's Prairie Pothole Region, including vegetation, wildlife, invertebrates, fish, hydrology, and water chemistry.
| Gregory A. Knutsen & Ned H. Euliss | U.S. Geological Survey | 2001
Synthesizes studies comparing restored prairie pothole wetlands with natural wetlands and identifies major gaps in restoration science.
Peatlands
| United Nations Environment Programme | UNEP | 2026
Provides scientific resources supporting conservation, restoration, mapping, monitoring, and sustainable management of peatlands around the world.
| Global Peatlands Initiative | United Nations Environment Programme | 2022
Presents a comprehensive global assessment of peatland extent, condition, threats, biodiversity, climate importance, and opportunities for conservation and restoration.
| United Nations Environment Programme | UNEP | 2019
Explores connections between peatland conservation and human health, including cleaner water, reduced peat fires, improved air quality, and climate benefits.
| United Nations Environment Programme | UNEP | 2018-01-30
Explains the extraordinary importance of peatlands as long-term carbon stores and argues that their conservation is an important climate strategy.
Wetland Hydrology
| Alice Twomey et al. | U.S. Geological Survey / Science of the Total Environment | 2024-01-06
Explains how hydrological models can be selected and used when designing coastal wetland restoration projects.
| Alice Twomey et al. | U.S. Geological Survey / Science of the Total Environment | 2024
Reviews modeling approaches for restoring tidal flow and other hydrological processes in degraded coastal wetlands.
| U.S. Geological Survey | USGS | n.d.
Provides extensive research on groundwater, surface water, floods, droughts, water quality, and other hydrological processes affecting wetlands.
Wetland Restoration Science
| F. W. Keppeler et al. | NOAA Repository / Restoration Ecology | 2024
Compares created and natural marshes using ecosystem models and finds that apparently similar plant and animal communities can conceal important differences in ecosystem processes.
| Joy B. Zedler | NOAA Repository / California Sea Grant | n.d.
Synthesizes research on tidal wetland restoration in Southern California, including restoration challenges, monitoring, planning, and adaptive management.
Marshes and Tidal Wetlands
| National Park Service | NPS | n.d.
Introduces coastal wetlands found within and around national parks and discusses their ecological importance and vulnerability.
Wetland Wildlife
| Ducks Unlimited | Ducks Unlimited | n.d.
Presents scientific research on waterfowl ecology, migration, breeding, habitat requirements, and wetland management.
| National Audubon Society | Audubon | n.d.
Examines conservation of water-dependent ecosystems that provide essential habitat for birds throughout their life cycles.
Wetlands and Amphibians
| U.S. Geological Survey | USGS | n.d.
Provides research on amphibian populations and habitats, many of which depend on marshes, ponds, seasonal wetlands, and other aquatic environments.
| U.S. Geological Survey | USGS | n.d.
Conducts research on prairie wetlands and the birds, amphibians, plants, and other organisms that depend upon them.
| U.S. Fish and Wildlife Service | USFWS | n.d.
Provides conservation information about threatened, endangered, and other wildlife species, including numerous wetland-dependent amphibians.
| National Park Service | NPS | n.d.
Examines amphibians and reptiles inhabiting national parks, including species strongly dependent upon wetlands and aquatic habitats.
Wetland Birds and Migration
| U.S. Fish and Wildlife Service | USFWS | n.d.
Describes conservation programs for migratory birds, many of which rely upon wetlands as breeding, feeding, staging, and wintering habitats.
| U.S. Fish and Wildlife Service | USFWS | n.d.
Explores conservation programs protecting migratory birds and their habitats across international flyways.
| BirdLife International | BirdLife International | n.d.
Explores the conservation of migratory birds and the interconnected network of wetlands and other habitats required during annual migrations.
| National Audubon Society | Audubon | n.d.
Describes conservation programs protecting birds and important habitats including marshes, estuaries, lakes, floodplains, and coastal wetlands.
Wetland Monitoring and Mapping
| U.S. Geological Survey | USGS | n.d.
Provides national geospatial information that can be combined with wetland inventories for landscape analysis and environmental planning.
| U.S. Environmental Protection Agency | EPA | n.d.
Describes approaches for monitoring and assessing wetland condition using biological, chemical, physical, and landscape indicators.
| U.S. Environmental Protection Agency | EPA | n.d.
Describes the National Wetland Condition Assessment, a statistically designed survey evaluating the ecological condition of wetlands across the United States.
Wetland Conservation and the Future
| Various Authors | Frontiers in Environmental Science | Frontiers | n.d.
Publishes research on wetland restoration, ecosystem management, hydrology, climate change, biodiversity, and environmental science.
| Society for Ecological Restoration | SER | n.d.
Provides scientific resources, standards, and professional guidance for restoring degraded ecosystems, including wetlands.
Recent Wetland Science and Restoration
| E. Naiti-Johnson et al. | U.S. Geological Survey / Restoration Ecology | 2026-07-01
Research from Louisiana examines how elevation, tidal exchange, salinity, and access to upland migration space affect whether diverse coastal marsh communities can persist as sea levels rise.
| Various Authors | U.S. Geological Survey | 2026-01-30
Researchers investigate how tidal-marsh degradation associated with sea-level rise alters rates and spatial patterns of organic-carbon accumulation.
| Emily N. Fromenthal et al. | U.S. Geological Survey / Restoration Ecology | 2025-11-24
Identifies elevation ranges that maximize survival and growth of important marsh plants, providing practical targets for restoration projects using dredged sediment.
| Megan D. Pagliaro et al. | U.S. Geological Survey / Ecological Applications | 2025-10-11
Tests whether restored tidal marshes recover the food-web pathways necessary to support fish populations and finds that ecological recovery can lag behind habitat restoration.
Documents three decades of expansion of aquatic and marsh habitat along portions of the Upper Mississippi and Illinois rivers as hydrological conditions and land use changed.
Measures sediment movement and elevation change in a restored San Francisco Bay salt marsh to determine whether the marsh can build vertically fast enough to withstand rising seas.
| Judith Z. Drexler & Jake Weltzin | U.S. Geological Survey | 2025
Summarizes recent scientific work on wetland restoration, fish and wildlife, invasive species, hazards, water quality, and ecosystem recovery across the San Francisco Bay–Delta.
| Various Authors | U.S. Geological Survey | 2024-10-11
Evaluates when restoration of coastal wetlands can genuinely increase carbon sequestration enough to function as an effective natural climate solution.
| Melissa Millman Baustian et al. | U.S. Geological Survey / Restoration Ecology | 2024-09-03
Models greenhouse-gas consequences of maintaining, losing, or restoring marsh and mangrove habitats along the Louisiana coast.
Salt Marsh Restoration
| U.S. Fish and Wildlife Service | USFWS | 2025-07-10
Presents plans for wetland-restoration work at Blackwater National Wildlife Refuge, an important Atlantic Flyway waterfowl sanctuary in Maryland.
| U.S. Fish and Wildlife Service | USFWS | 2025-05-21
Describes projects that use sediment and dredged material to rebuild disappearing coastal marshes on national wildlife refuges in southeastern Louisiana.
| Pacific Coastal and Marine Science Center | USGS | 2025-04-23
Explains how scientists are measuring sediment delivery and marsh elevation in one of the largest tidal-wetland restoration projects on the U.S. West Coast.
| Judith Weis & Lisamarie Windham-Myers | U.S. Geological Survey | 2024-03-22
Reviews disturbances affecting salt marshes and discusses restoration options as climate change, development, pollution, and altered hydrology threaten these ecosystems.
| U.S. Fish and Wildlife Service | USFWS | 2023
Examines restoration of Dusky Marsh at Baskett Slough National Wildlife Refuge and how restoration techniques evolved to better accommodate native fish passage.
| U.S. Fish and Wildlife Service | USFWS | n.d.
Describes salt-marsh restoration at Parker River National Wildlife Refuge in Massachusetts as a nature-based approach to improving habitat and climate resilience.
| U.S. Fish and Wildlife Service | USFWS | n.d.
Examines tidal-marsh and dune restoration at Prime Hook National Wildlife Refuge in Delaware following severe coastal degradation.
Floodplains and River Wetlands
| U.S. Fish and Wildlife Service | USFWS | 2025-05-21
Describes restoration of the Little Yellow River and roughly 30,000 acres of wetlands at Necedah National Wildlife Refuge in Wisconsin.
| Shannon Ehlers | U.S. Fish and Wildlife Service | 2025-04-16
Examines a project reconnecting historic Kootenai River floodplains through levee modifications, wetland enhancement, road changes, and restoration of hydrological connections.
| U.S. Environmental Protection Agency | EPA | n.d.
Discusses restoration of wetlands and river corridors as interconnected components of healthy watersheds.
| U.S. Fish and Wildlife Service | USFWS | n.d.
Describes voluntary habitat-restoration partnerships with private landowners that frequently include wetlands, floodplains, streams, and riparian habitats.
| Natural Resources Conservation Service | USDA | n.d.
Explains watershed-protection programs that can restore floodplains and natural hydrology while reducing threats to communities.
| Natural Resources Conservation Service | USDA | n.d.
Introduces watershed-scale conservation and explains connections among streams, groundwater, wetlands, floodplains, and land management.
| U.S. Fish and Wildlife Service | USFWS | n.d.
Describes efforts to reconnect rivers and floodplains by removing or modifying barriers that interfere with aquatic habitat and natural water movement.
| U.S. Environmental Protection Agency | EPA | n.d.
Examines how development alters streams, runoff, riparian zones, floodplains, and associated wetland environments.
| U.S. Geological Survey | USGS | n.d.
Provides research on water quality and watershed processes affecting rivers, floodplains, wetlands, lakes, and groundwater.
| U.S. Geological Survey | USGS | n.d.
Studies landscape change and its consequences for habitats including wetlands, floodplains, coastal systems, and wildlife.
Wetland Carbon and Greenhouse Gases
| U.S. Geological Survey | USGS | 2025
Investigates how restoration affects carbon cycling, carbon export, and ecological health in coastal Louisiana wetlands.
| U.S. Geological Survey | USGS | n.d.
Examines carbon captured and stored in coastal wetlands and other blue-carbon ecosystems.
| Smithsonian Institution | Smithsonian | n.d.
Explores the capacity of coastal wetlands to capture carbon in plant material and waterlogged sediments.
| Smithsonian Environmental Research Center | SERC | n.d.
Describes long-term research into carbon storage and greenhouse-gas cycling in coastal wetlands.
| Smithsonian Environmental Research Center | SERC | n.d.
Examines how elevated carbon dioxide, warming, sea-level rise, and other environmental changes affect tidal-marsh ecosystems.
| United Nations Environment Programme | UNEP | n.d.
Provides international information on peatland carbon, biodiversity, restoration, fire, land degradation, and climate change.
| Global Peatlands Initiative | UNEP and Partners | n.d.
Provides international research and policy resources for protecting peatlands and their exceptionally large carbon stores.
| International Union for Conservation of Nature | IUCN | n.d.
Explains how coastal ecosystems such as mangroves and salt marshes store blue carbon and contribute to climate mitigation.
| Conservation International, IUCN & IOC-UNESCO | Blue Carbon Initiative | n.d.
Provides scientific and policy resources for protecting coastal wetlands as important natural carbon reservoirs.
Wetland Monitoring and Remote Sensing
| U.S. Environmental Protection Agency | EPA | n.d.
Describes the National Wetland Condition Assessment, a nationwide survey designed to estimate the ecological condition of American wetlands.
| U.S. Environmental Protection Agency | EPA | n.d.
Provides guidance for developing wetland monitoring and assessment programs at state, tribal, regional, and watershed scales.
| U.S. Fish and Wildlife Service | USFWS | n.d.
Provides downloadable geospatial data from the National Wetlands Inventory for mapping and environmental analysis.
| U.S. Fish and Wildlife Service | USFWS | n.d.
Provides an interactive mapping system for locating and examining wetlands across the United States.
| U.S. Fish and Wildlife Service | USFWS | n.d.
Explains the data standards and mapping information used by the National Wetlands Inventory.
| U.S. Geological Survey / NASA | Landsat | n.d.
Describes satellite observations widely used to measure changes in wetlands, floodplains, coastlines, vegetation, and surface water.
| U.S. Geological Survey | USGS EROS | n.d.
Explores the use of satellite imagery for tracking surface water, inundation, and environmental change.
| National Oceanic and Atmospheric Administration | NOAA Digital Coast | n.d.
Provides coastal elevation, land-cover, imagery, inundation, and habitat datasets frequently used in wetland planning and restoration.
| NOAA Office for Coastal Management | NOAA Digital Coast | n.d.
Provides mapping tools, datasets, and technical resources specifically useful for coastal-wetland management.
Coastal Resilience and Sea-Level Rise
| Great Lakes Science Center | USGS | 2025
Examines coastal wetland vulnerability, restoration, management, habitat quality, and ecological responses to climate change.
| U.S. Geological Survey | USGS | n.d.
Studies shoreline change, storms, sea-level rise, erosion, and other hazards that affect coastal wetlands.
| NOAA Office for Coastal Management | NOAA | n.d.
Explains how wetlands and other natural infrastructure can reduce coastal hazards while providing ecological benefits.
| NOAA Office for Coastal Management | NOAA | n.d.
Provides tools for evaluating flooding, storms, sea-level rise, habitat change, and coastal resilience.
| NOAA Office for Coastal Management | NOAA | n.d.
Interactive sea-level-rise mapping allows users to visualize potential inundation and threats to low-lying coastal wetlands.
| National Oceanic and Atmospheric Administration | NOAA | n.d.
Explains the causes and consequences of sea-level rise, including impacts on marshes, estuaries, mangroves, and coastal communities.
| NOAA Fisheries | NOAA | n.d.
Describes living shorelines that use vegetation and other natural materials to stabilize coasts while preserving wetland habitat.
| National Oceanic and Atmospheric Administration | NOAA Habitat Blueprint | n.d.
Examines living shorelines as alternatives to hardened seawalls for protecting coastal property and ecosystems.
| National Wildlife Federation | NWF | n.d.
Discusses the threat rising seas pose to salt marshes and other low-lying coastal habitats.
| The Nature Conservancy | TNC | n.d.
Explains how living shorelines and restored coastal habitats can reduce erosion while maintaining ecological functions.
Mangrove Conservation and Restoration
| Food and Agriculture Organization | FAO | 2018
Reviews global changes in mangrove area and the human and environmental forces driving mangrove loss and recovery.
| Global Mangrove Alliance | Global Mangrove Alliance | n.d.
Provides global information, research, mapping, conservation strategies, and restoration guidance for mangrove ecosystems.
| Global Mangrove Alliance | Global Mangrove Alliance | n.d.
Presents best-practice guidance intended to improve ecological success in mangrove-restoration projects.
| United Nations Environment Programme | UNEP | n.d.
Examines mangrove protection and restoration as part of international blue-carbon conservation.
| Food and Agriculture Organization | FAO | n.d.
Provides information on the distribution, condition, management, and conservation of mangrove forests worldwide.
| International Union for Conservation of Nature | IUCN | n.d.
Discusses ecological principles and conservation considerations important to successful mangrove restoration.
| Conservation International | Conservation International | n.d.
Explores the importance of mangroves for climate, fisheries, biodiversity, coastal protection, and local communities.
| The Nature Conservancy | TNC | n.d.
Describes mangrove conservation and restoration projects designed to protect coastal ecosystems and communities.
| World Resources Institute | WRI | n.d.
Examines the opportunities and challenges involved in restoring mangroves as part of climate and biodiversity strategies.
| World Resources Institute | WRI | n.d.
Provides water-risk and geospatial information useful for understanding pressures on wetlands, deltas, mangroves, and freshwater ecosystems.
Wetlands and Migratory Wildlife
| U.S. Fish and Wildlife Service | USFWS | n.d.
Describes regional partnerships that conserve wetlands and other habitats important to migratory birds throughout North America.
| U.S. Fish and Wildlife Service | USFWS | n.d.
Explains a continental conservation strategy focused heavily on protecting and restoring wetland habitats used by waterfowl.
| U.S. Fish and Wildlife Service | USFWS | n.d.
Explains how Federal Duck Stamp revenue supports acquisition and protection of wetlands and other wildlife habitat.
| U.S. Fish and Wildlife Service | USFWS | n.d.
Describes funding used to purchase and conserve important migratory-bird habitats, particularly wetlands.
| U.S. Fish and Wildlife Service | USFWS | n.d.
Describes large-scale surveys used to measure waterfowl populations and habitat conditions across wetland landscapes.
| Ducks Unlimited | Ducks Unlimited | n.d.
Examines wetland restoration projects throughout the Great Lakes region benefiting waterfowl and other wildlife.
| Ducks Unlimited | Ducks Unlimited | n.d.
Describes land-protection programs dedicated to conserving wetlands and associated wildlife habitats.
| BirdLife International | BirdLife International | n.d.
Highlights threats to internationally important wetlands used by migratory and resident bird populations.
| National Audubon Society | Audubon | n.d.
Examines water-management and wetland-conservation initiatives intended to sustain birds and human communities.
| National Audubon Society | Audubon | n.d.
Describes conservation of marshes, estuaries, beaches, islands, and other coastal habitats important to birds.
Wetland Policy, Funding, and Protection
| U.S. Environmental Protection Agency | EPA | 2026-04-15
Describes a grant program supporting community-based wetland, riparian, stream, and urban-water restoration projects throughout the United States.
| U.S. Environmental Protection Agency | EPA | 2026
Introduces voluntary restoration, rehabilitation, and protection of natural wetlands outside mandatory mitigation requirements.
| U.S. Environmental Protection Agency | EPA | 2025-10-03
Explains how states and tribes can establish voluntary wetland protection and restoration programs.
| U.S. Environmental Protection Agency | EPA | 2025
Provides descriptions of hundreds of previously funded community wetland and watershed restoration projects.
| U.S. Environmental Protection Agency | EPA | 2024-08-08
Reports funding for wetland monitoring, restoration, protection, regulation, and water-quality programs in Mid-Atlantic states.
| U.S. Environmental Protection Agency | EPA | 2024-03-12
Describes more than $43 million in federal funding for restoration and water-quality projects in San Francisco Bay and its watersheds.
| U.S. Environmental Protection Agency | EPA | 2022
Describes grants supporting wetland inventories, monitoring, restoration, sediment management, and climate resilience throughout California.
| Natural Resources Conservation Service | USDA | n.d.
Explains conservation easements used to protect agricultural lands and restore or conserve wetlands on private property.
| U.S. Fish and Wildlife Service | USFWS | n.d.
Explains major federal grants supporting acquisition, restoration, enhancement, and management of wetlands used by migratory birds.
Global Wetland Conservation and Outlook
| Convention on Wetlands | Global Wetland Outlook 2025 | 2025
Assesses the worldwide condition and economic value of wetlands, trends in wetland loss and degradation, and the scale of investment required to reverse those trends.
| Convention on Wetlands | Ramsar COP15 | 2025
Reviews global wetland-restoration commitments, degraded-wetland extent, restoration priorities, and progress toward international biodiversity targets.
| Government of Kenya / Convention on Wetlands | Ramsar Convention | 2025
Reports Kenya's wetland policies, conservation measures, restoration priorities, and national commitments under the Convention on Wetlands.
| Convention on Wetlands / UNEP | Global Wetland Outlook | 2021
Reviews global wetland trends and explains why wetland conservation is important for biodiversity, climate, water security, and sustainable development.
| Convention on Wetlands | Ramsar Convention | n.d.
Provides international guidance and policy resources for restoring degraded wetlands and recovering ecosystem functions.
| Convention on Wetlands | Ramsar Convention | n.d.
Examines wetlands as both vulnerable ecosystems and important tools for climate mitigation and adaptation.
| Convention on Wetlands | Ramsar Convention | n.d.
Explains how floodplains, mangroves, marshes, and other wetlands can reduce exposure to floods, storms, erosion, and other natural hazards.
| Convention on Wetlands | Ramsar Convention | n.d.
Explores interactions between agriculture and wetlands, including drainage, irrigation, food production, water use, and sustainable management.
| Convention on Wetlands | Ramsar Convention | n.d.
Examines the central role wetlands play in freshwater storage, groundwater recharge, water purification, and watershed function.
| Wetlands International | Wetlands International | n.d.
Explains the global importance of wetlands for water supplies, biodiversity, climate regulation, livelihoods, fisheries, and resilience.
