Swamps represent some of the most fascinating and ecologically diverse ecosystems on our planet. These waterlogged environments, characterized by their saturated soils and distinctive vegetation, create a complex tapestry of microclimates that vary dramatically from one swamp type to another. Understanding these microclimates—localized atmospheric zones with conditions that differ from the surrounding areas—is essential for appreciating the remarkable biodiversity and ecological functions that swamps provide. From the steamy tropical mangrove forests to the cool, shaded cypress swamps of temperate regions, each swamp type harbors unique microclimate characteristics that shape the lives of countless plant and animal species.
Understanding Swamp Microclimates: The Basics
The interaction between the swamp's opaque waters and air generates moisture, often creating a microclimate that feels considerably more humid than surrounding regions. This fundamental characteristic sets swamps apart from other terrestrial ecosystems and creates the foundation for their unique environmental conditions. Swamps are characterized by high humidity levels, which result from the abundant presence of water. These elevated moisture levels influence everything from temperature regulation to the types of organisms that can survive in these environments.
Swamps are characterized by their saturated soils and slow-moving waters. The water that accumulates in swamps comes from a variety of sources including precipitation, groundwater, tides and/or freshwater flooding. This diverse array of water sources contributes to the complexity of swamp microclimates, as each source brings different temperatures, mineral content, and seasonal patterns that influence local atmospheric conditions.
Temperature patterns in swamps create distinct microclimate zones that can vary significantly even within a single swamp system. The temperature varies between 15 and 35 degrees Celsius (59-95 degrees Fahrenheit), although this accounts for very different biomes. These temperature ranges support different types of swamp ecosystems, from cool temperate swamps to warm tropical environments, each with its own microclimate signature.
Freshwater Swamp Microclimates
Tropical Freshwater Swamps
Freshwater swamps are common in tropical areas near the Equator. These equatorial swamps usually experience year-round heat and humidity. The consistent warmth and moisture create remarkably stable microclimates that support extraordinary biodiversity. In tropical areas, temperatures typically hover between 77°F and 95°F (25°C to 35°C), allowing for rapid growth of vegetation and a diverse range of species.
Tropical swamps enjoy a climate that remains relatively constant throughout the year. High levels of humidity and consistent warm temperatures create a unique stability that supports rich biodiversity. This climatic stability means that organisms don't need to adapt to dramatic seasonal changes, allowing for year-round activity and reproduction cycles that differ markedly from temperate swamp ecosystems.
The thick canopy of trees means Congolian swamp forests are more shaded and humid than other wetlands. This canopy effect creates multiple microclimate layers within the swamp, with conditions at ground level differing substantially from those in the mid-canopy or upper reaches. The dense vegetation traps moisture and creates cooler, more stable conditions beneath the tree cover, while the canopy itself experiences greater temperature fluctuations and direct solar radiation.
Temperate Freshwater Swamps
Temperate swamps may experience seasonal variations, with warmer summers and cooler winters dictating the cycles of life within their waters. These seasonal fluctuations create dynamic microclimates that change throughout the year, requiring organisms to adapt to varying conditions or migrate to more favorable areas during extreme periods.
Freshwater swamps often form on flat land around lakes or streams, where the water table is high and runoff is slow. Seasonal flooding and rainwater cause the water level in these swamps to fluctuate, or change. These water level changes directly impact microclimate conditions, as flooding events can cool the environment, increase humidity, and alter the distribution of shaded versus exposed areas within the swamp.
These forests are typically found in low-lying areas, riverbanks, and floodplains where there is a consistent supply of freshwater. A forest that is frequently flooded with relatively fresh water rich in minerals is referred to as a freshwater swamp forest. The mineral-rich water supports lush vegetation growth, which in turn influences microclimate conditions by creating dense shade, transpiring moisture into the air, and moderating temperature extremes.
Floodplain Swamp Microclimates
Floodplain swamps, which develop on the bottomlands that surround rivers, are most extensive in the tropics and subtropics. The Amazon Basin of northern South America and the Congo Basin of equatorial Africa both harbor vast swamp forests in a mosaic with lowland tropical rainforest. Big bottomland swamps also prevail across much of the southeastern U.S., carpeting the floodplains of big rivers like the Mississippi, Atchafalaya and Altamaha.
Swamps that are only seasonally inundated are common in regions where hydrological patterns vary markedly across the year. The amount of time in which a swamp has standing water is called its "hydroperiod." The water level in wet- and dry-season swamps can rise and fall in concert with the water table. Similarly, a floodplain swamp may be mostly dry outside seasonal high-water periods, during which swollen rivers overspill their banks. These hydroperiod variations create dramatically different microclimate conditions between wet and dry seasons, with humidity, temperature, and light availability all shifting as water levels change.
Saltwater Swamp Microclimates
Mangrove Swamp Environments
Saltwater swamps, dominated by mangrove forests, create some of the most distinctive microclimates found in any ecosystem. Saltwater swamps are found along tropical and subtropical coastlines. These coastal environments experience unique microclimate conditions influenced by tidal cycles, salt spray, and the moderating effects of nearby ocean waters.
Saltwater swamps often develop in tropical coastal areas. They're formed when flats of sand and mud are then covered by seawater. The water often comes in during the high tide. This tidal influence creates rhythmic microclimate fluctuations, with conditions changing predictably throughout each day as tides ebb and flow. During high tide, the swamp becomes cooler and more humid, while low tide periods may expose mudflats to direct sunlight, creating warmer, drier conditions.
In many parts of their great brackish range — from the Caribbean to the Philippines — mangrove swamps regularly contend with tropical cyclones. Hurricanes in the coastal Everglades, for example, can topple old, tall mangroves outright or choke whole groves with seafloor muck, creating ghost woods of standing snags and bleached logs. These extreme weather events can dramatically alter microclimate conditions, opening up previously shaded areas and changing water flow patterns that persist for years or even decades.
Salinity and Microclimate Interactions
The salinity levels in saltwater swamps create unique microclimate characteristics that differ from freshwater systems. Salt water has different thermal properties than freshwater, affecting how quickly the environment heats and cools. Additionally, salt-tolerant vegetation has different transpiration rates and canopy structures compared to freshwater plants, influencing humidity levels and temperature regulation within the swamp.
Mangrove trees create particularly complex microclimate structures through their distinctive root systems. The prop roots and pneumatophores (breathing roots) that characterize many mangrove species create intricate three-dimensional structures that trap moisture, provide shade, and create numerous microhabitats with varying temperature and humidity conditions. These root systems also slow water movement, allowing sediment to settle and creating calmer, more stable microclimate conditions at ground level.
Peat Swamps and Bog Microclimates
Wetlands are generally minerotrophic (waters contain dissolved materials from soils) with the exception of ombrotrophic bogs that are fed only by water from precipitation. Because bogs receive most of their water from precipitation and humidity from the atmosphere, their water usually has low mineral ionic composition. This unique hydrology creates distinctive microclimate conditions in peat swamps and bogs.
The sphagnum peats of northern bogs cause especially acidic waters. The result is a wetland ecosystem with a very specialized and unique flora and fauna that can grow in these conditions called acidophiles. The acidic conditions in these environments influence microclimate characteristics by affecting decomposition rates, nutrient cycling, and the types of vegetation that can establish, all of which feedback into local temperature and humidity patterns.
Peat swamps in tropical regions create different microclimate conditions than their northern counterparts. Rain, rivers, and groundwater are all sources of water, whereas rain is the only source of water for peat swamp forests. The reliance on precipitation creates microclimates that are particularly sensitive to rainfall patterns and seasonal variations in precipitation.
Key Factors Influencing Swamp Microclimates
Water Chemistry and Salinity
Water chemistry within wetlands is determined by the pH, salinity, nutrients, conductivity, soil composition, hardness, and the sources of water. Water chemistry varies across landscapes and climatic regions. These chemical characteristics directly influence microclimate conditions by affecting evaporation rates, the types of vegetation that can grow, and the thermal properties of the water itself.
Salinity creates particularly strong effects on swamp microclimates. In contrast, wetlands fed by groundwater or tides have a higher concentration of dissolved nutrients and minerals. Higher mineral content affects water density and thermal capacity, influencing how quickly the swamp heats and cools throughout the day and across seasons.
Elevation and Topography
The elevation and geographic location of swamps can greatly affect their climate. For example, swamps situated at lower elevations are often warmer and hold more water than those on higher ground. Proximity to mountains or bodies of water can also play a role, creating unique microclimates. Even small elevation differences within a swamp can create distinct microclimate zones, with slightly higher areas experiencing different flooding frequencies, drainage patterns, and vegetation communities.
Topography and water supply are the two most important features in determining the distribution of freshwater swamps. The nature of soils and bedrock is important in determining the drainage in a region, but wetlands may exist locally on any base from sands to impervious rock. These topographic and geological features create the physical template upon which microclimates develop, controlling water movement, pooling, and drainage that directly affect local atmospheric conditions.
Vegetation Cover and Canopy Structure
Vegetation plays a crucial role in creating and maintaining swamp microclimates. Dense plant growth creates shaded areas that remain cooler and more humid than exposed locations. The canopy structure determines how much solar radiation reaches the swamp floor, how wind moves through the environment, and how moisture is retained or released into the atmosphere.
The flow of water through wetlands is slow because of low gradients and retarding effects of the vegetation. Dead plant matter settles rather than being washed away. The slow replacement and lack of turbulence in the water result in a low rate of oxygen supply. Decay of the dead vegetation quickly uses up what oxygen is supplied, so that the mud and bottom waters are low or lacking in oxygen content. These conditions create unique microclimate characteristics at the water-soil interface, with anaerobic conditions producing distinctive chemical signatures and affecting temperature regulation.
Different vegetation types create different microclimate effects. In many freshwater swamps in the southeastern United States, cypress and tupelo trees grow. Spanish moss may hang from the branches, and tiny plants called duckweed may cover the waters surface. Shrubs and bushes may grow beneath the trees. This layered vegetation structure creates multiple microclimate zones at different heights, from the water surface through the understory to the canopy.
Tidal Influence and Water Movement
In coastal swamps, tidal cycles create rhythmic microclimate fluctuations that occur on predictable daily schedules. High tides bring cooler ocean water into the swamp, temporarily lowering temperatures and increasing salinity. Low tides expose mudflats and root systems to air, allowing for warming and drying. These regular cycles create unique adaptation pressures for organisms living in tidal swamps.
Water movement patterns also influence microclimate development. Stagnant water heats and cools differently than flowing water, and the presence or absence of current affects how heat and moisture are distributed throughout the swamp. Areas with gentle water flow may experience more moderate temperature fluctuations compared to completely still pools or rapidly flowing channels.
Seasonal Variations and Hydroperiod
The hydroperiod—the seasonal pattern of water level fluctuations—creates temporal microclimate variations that can be as important as spatial differences. During wet seasons, increased water coverage creates cooler, more humid conditions with less temperature variation between day and night. Dry seasons expose more soil and vegetation to direct sunlight, creating warmer, drier microclimates with greater temperature extremes.
In inland freshwater swamp forests, flooding is typically sporadic, irregular, or seasonal. The water depth can vary greatly from a few centimeters to several meters. These physical factors affect the ecology of freshwater swamp forests, either singly or in combination. These variations create dynamic microclimate conditions that organisms must adapt to, either through physiological flexibility, behavioral adjustments, or life cycle timing.
Microclimate Layers Within Swamp Ecosystems
Canopy Layer Microclimates
The uppermost layer of swamp vegetation experiences the most extreme microclimate conditions, with direct exposure to sunlight, wind, and precipitation. Canopy temperatures can be significantly higher than ground-level temperatures during the day, while nighttime cooling can be more pronounced. Wind speeds are highest in the canopy, affecting transpiration rates and moisture loss from vegetation.
Canopy microclimates also vary depending on tree density and species composition. Dense, closed canopies create more stable conditions below, while gaps in the canopy allow sunlight penetration that creates warm, bright patches at lower levels. These canopy gaps can be created by natural tree fall, storm damage, or the growth patterns of the vegetation itself.
Understory Microclimates
The understory layer—the zone between the canopy and the water or ground surface—experiences more moderate microclimate conditions. Shaded by the canopy above, this layer remains cooler and more humid than the canopy itself. Light levels are lower, creating conditions that favor shade-tolerant plant species and animals that prefer cooler, moister environments.
Air movement in the understory is typically reduced compared to the canopy, creating more stagnant conditions that can trap humidity and moderate temperature fluctuations. This layer often serves as a critical habitat for many swamp species, providing refuge from the extremes experienced in both the canopy and at the water surface.
Water Surface and Aquatic Microclimates
The water surface itself represents a distinct microclimate zone where atmospheric and aquatic conditions meet. Surface water temperatures respond to solar radiation, air temperature, and evaporative cooling. In shaded areas, water remains cooler and more stable, while exposed areas can experience significant warming during sunny periods.
Floating vegetation like duckweed creates additional microclimate complexity at the water surface. These plant mats shade the water below, reducing light penetration and moderating temperature fluctuations. They also affect gas exchange between water and atmosphere, influencing oxygen and carbon dioxide levels that affect aquatic organisms.
Substrate and Root Zone Microclimates
The soil and root zone at the bottom of swamps experiences the most stable microclimate conditions, buffered from atmospheric fluctuations by overlying water and vegetation. Temperatures remain relatively constant, and conditions are typically anaerobic due to waterlogging. Freshwater swamp forests contain soft, unstable, and anoxic soil due to their waterlogged condition, which may have influenced the evolution of unique root adaptations in these trees that resemble those seen in a real mangrove forest.
These substrate conditions create unique chemical microclimates characterized by reduced oxygen, elevated carbon dioxide, and the presence of methane and other gases produced by anaerobic decomposition. These conditions influence which organisms can survive in the root zone and affect nutrient cycling processes that ultimately influence the entire swamp ecosystem.
Ecological Significance of Swamp Microclimates
Biodiversity Support and Species Distribution
Swamp microclimates support remarkable biodiversity by creating numerous ecological niches within a relatively small area. The lack of extreme seasonal variation means that numerous species can remain active year-round, making these swamps crucial habitats for countless organisms. Birds, reptiles, and various amphibians enjoy this warm climate, often seen basking in the sun or lurking among the dense vegetation.
Freshwater swamp forests are rich in biodiversity and provide habitat for a wide range of plant and animal species. They support numerous aquatic species, amphibians, reptiles, and mammals. Birds are also abundant in these ecosystems. The flooded conditions can make these areas particularly important for fish breeding and spawning. The variety of microclimate conditions allows different species to partition the environment, reducing competition and allowing more species to coexist.
The muddy floor of these swamps is home to hundreds of insects, reptiles, and amphibians, including dozens of species of frogs. Congolian swamp forests are also home to a wide variety of large mammals. Most of these mammals are herbivores. Colobus and mangabey monkeys eat mostly tropical fruit. Other mammals, such as forest buffalo, forest elephants, and lowland gorillas, feed on the abundant vegetation of the wetland. This diversity reflects the complex microclimate structure that provides suitable conditions for organisms with different environmental requirements.
Climate Regulation and Buffering
Wetlands can reduce the effects drought and heat have on wildlife by providing a source of water or moist, cool microclimates. This buffering function extends beyond the swamp itself, as the cool, moist air generated within swamps can moderate temperatures in surrounding areas, particularly during hot, dry periods.
Swamps also play important roles in regional climate regulation through their effects on water cycling and heat exchange. The high rates of evapotranspiration from swamp vegetation pump moisture into the atmosphere, contributing to cloud formation and precipitation patterns. This moisture release also consumes energy, cooling the local environment and moderating temperature extremes.
Habitat Refugia During Environmental Stress
Additionally, a highly varied environment might provide as a haven for species during times of stress like flooding or drought. The diversity of microclimates within swamps means that even when conditions become unfavorable in one part of the swamp, organisms may find suitable conditions in another area. This spatial heterogeneity increases ecosystem resilience and helps maintain biodiversity during environmental perturbations.
As the climate changes, wetlands also provide a corridor or stepping stone on the landscape that may help species move to better areas. The microclimate diversity within swamps may become increasingly important as climate change progresses, providing refugia where organisms can persist even as surrounding areas become less suitable.
Nutrient Cycling and Ecosystem Productivity
Swamp microclimates influence nutrient cycling processes that determine ecosystem productivity. The warm, humid conditions in many swamps accelerate decomposition and nutrient release, while the anaerobic conditions in waterlogged soils slow certain decomposition pathways and promote peat accumulation. This balance between rapid and slow nutrient cycling creates the characteristic productivity patterns of different swamp types.
Contrary to ombrotrophic swamp forests, which only absorb nutrients from rain, freshwater swamp forest soils are relatively nutrient-rich. In freshwater swamp forests, rain and changes in the water table result in the deposition of nutrients and alluvial soils. These nutrient inputs, combined with favorable microclimate conditions, support high rates of primary productivity that form the base of complex food webs.
Human Impacts on Swamp Microclimates
Drainage and Hydrological Alteration
Human activities that alter swamp hydrology can dramatically affect microclimate conditions. Drainage for agriculture or development lowers water tables, exposing previously waterlogged soils to air and fundamentally changing temperature and humidity patterns. These alterations can shift swamp microclimates toward drier, more variable conditions that may no longer support the original plant and animal communities.
Conversely, impoundment and water level manipulation can create artificially stable water levels that eliminate natural hydroperiod fluctuations. This stability may seem beneficial but can actually reduce microclimate diversity and eliminate the seasonal variations that many swamp species depend upon for their life cycles.
Vegetation Removal and Canopy Loss
Logging and vegetation clearing eliminate the canopy layer that creates much of the microclimate structure in swamps. Without tree cover, swamps experience greater temperature extremes, reduced humidity, increased wind speeds, and altered light regimes. These changes can trigger cascading effects throughout the ecosystem, affecting everything from soil moisture to species composition.
Fires of various intensities were used in southern Sumatra to burn down the swamp forest to make way for agriculture. There, a rich and complex environment was reduced to a habitat made up of uniform stands of fire-resistant Melaleuca L. species thickets as a result of widespread and frequent fires. Furthermore, improper management of these ecosystems through massive logging and agricultural conversion has resulted in serious deterioration and loss of ecological and biological diversity.
Climate Change Effects
Climate change is expected to impact wetlands due to changes in temperature and the timing and amount of precipitation. Coastal wetlands will also be impacted by sea level rise and changes in water chemistry. Those changes can alter wetland conditions and processes, including the types of habitat they provide, and their ability to manage water quality and flooding.
Rising temperatures, increased storm intensity, and shifting precipitation patterns can all negatively affect swamps' delicate balances. These changes may lead to altered species distributions, impacting biodiversity and water quality. As global climate patterns shift, swamp microclimates will change in ways that may exceed the adaptive capacity of some species, potentially leading to local extinctions and ecosystem reorganization.
Conservation and Management Implications
Protecting Microclimate Diversity
Effective swamp conservation requires understanding and protecting the full range of microclimate conditions present in these ecosystems. This means preserving not just the wettest, most characteristic areas, but also the transitional zones, seasonal pools, and upland edges that contribute to overall microclimate diversity. Conservation strategies should aim to maintain natural hydrological patterns, vegetation structure, and the physical features that create microclimate heterogeneity.
Ecologists recognize that swamps provide ecological services including flood control, fish production, water purification, carbon storage, and wildlife habitats. In many parts of the world authorities protect swamps. In parts of Europe and North America, swamp restoration projects are becoming widespread. These protection and restoration efforts must consider microclimate requirements to be successful.
Restoration Considerations
Often the simplest steps to restoring swamps involve plugging drainage ditches and removing levees. While these hydrological restoration actions are essential, successful swamp restoration also requires reestablishing the vegetation structure and canopy cover that create appropriate microclimate conditions. This may involve planting native trees and shrubs, protecting regenerating vegetation from herbivory, and allowing sufficient time for complex canopy structures to develop.
Restoration practitioners should consider the microclimate requirements of target species when designing restoration projects. Understanding which microclimate conditions are needed for successful reproduction, juvenile survival, and adult persistence can help guide decisions about hydrology, vegetation management, and site selection.
Monitoring and Adaptive Management
Monitoring swamp microclimates can provide early warning of ecosystem changes and help managers assess the effectiveness of conservation and restoration efforts. Temperature and humidity sensors placed at different heights and locations within swamps can reveal how microclimate conditions are changing over time and in response to management actions.
Wetlands are dynamic systems that experience cycles of wet and dry phases on seasonal, annual, and decadal scales. Because of that natural variability, many wetlands may be able to persist and continue to provide ecosystem services despite climate change. Understanding this natural variability in microclimate conditions is essential for distinguishing normal fluctuations from directional changes that may require management intervention.
Research Frontiers in Swamp Microclimate Studies
Advanced Monitoring Technologies
New technologies are revolutionizing our ability to study swamp microclimates. Remote sensing from satellites and drones can map temperature and moisture patterns across large swamp areas, revealing spatial patterns that would be impossible to detect through ground-based monitoring alone. Automated sensor networks can collect continuous data on temperature, humidity, light levels, and other microclimate variables, providing unprecedented detail about temporal variations.
These technological advances are particularly valuable in swamps, which are often difficult and dangerous to access for traditional field research. Freshwater swamp forests are a relatively understudied forest type in Southeast Asia, primarily because they are difficult to access and can harbor diseases spread by insects, such as mosquitoes. Remote and automated monitoring can help overcome these access challenges while providing more comprehensive data than periodic field visits.
Microclimate Modeling and Prediction
Computer models that simulate swamp microclimate dynamics are becoming increasingly sophisticated, incorporating detailed information about vegetation structure, hydrology, soil properties, and atmospheric conditions. These models can help predict how microclimates will respond to environmental changes, management actions, or restoration efforts, providing valuable tools for conservation planning.
Predictive modeling is particularly important for understanding how climate change will affect swamp microclimates. By simulating future conditions under different climate scenarios, researchers can identify which swamp types and locations are most vulnerable to microclimate disruption and prioritize them for protection or adaptive management.
Organism-Centered Microclimate Studies
Increasingly, researchers are studying microclimates from the perspective of individual organisms, using miniature sensors attached to animals or placed at the exact locations where organisms live. This approach reveals the actual microclimate conditions experienced by different species, which may differ substantially from conditions measured at standard weather station heights.
Understanding organism-scale microclimates is essential for predicting how species will respond to environmental changes. An organism living in the leaf litter may experience very different conditions than one in the canopy, even though both inhabit the same swamp. These fine-scale differences can determine whether a species can persist in a changing environment or must relocate to find suitable conditions.
Conclusion: The Vital Importance of Swamp Microclimates
The microclimates within different swamp types represent a crucial but often overlooked aspect of these remarkable ecosystems. From the stable warmth and humidity of tropical freshwater swamps to the tidally influenced conditions of mangrove forests, from the acidic coolness of northern peat bogs to the seasonally variable environments of temperate floodplain swamps, each swamp type creates distinctive microclimate conditions that shape the lives of countless organisms.
Understanding these microclimates enhances our appreciation for the complexity and diversity of swamp ecosystems. The interplay of water chemistry, elevation, vegetation structure, tidal influence, and seasonal patterns creates a mosaic of environmental conditions that supports extraordinary biodiversity and provides essential ecosystem services. These microclimates regulate local and regional temperatures, moderate humidity, provide refugia during environmental stress, and create the conditions necessary for the unique communities of plants and animals that make swamps such fascinating places.
As human activities continue to alter swamp ecosystems and climate change reshapes environmental conditions globally, protecting and understanding swamp microclimates becomes increasingly important. Conservation efforts must consider the full range of microclimate conditions present in swamps, not just the most obvious or accessible areas. Restoration projects need to reestablish the physical and biological structures that create appropriate microclimate conditions for target species and ecosystem functions.
The study of swamp microclimates also offers valuable insights into broader ecological principles. These systems demonstrate how physical environmental factors interact with biological processes to create complex, self-organizing ecosystems. They show how spatial and temporal heterogeneity in environmental conditions can promote biodiversity and ecosystem resilience. And they illustrate the importance of considering multiple scales—from the canopy to the substrate, from daily tidal cycles to seasonal flooding patterns—when trying to understand how ecosystems function.
Looking forward, continued research into swamp microclimates will be essential for effective conservation and management of these vital ecosystems. New monitoring technologies, sophisticated modeling approaches, and organism-centered studies promise to reveal even more about how these microclimates function and how they may change in the future. This knowledge will be crucial for protecting swamps and the countless species that depend on them in an era of rapid environmental change.
By recognizing the unique microclimates within different swamp types and understanding the factors that create and maintain them, we gain deeper insight into these ecosystems' ecological importance and the urgent need to conserve them. Swamps are not just waterlogged forests or coastal wetlands—they are complex environmental mosaics where subtle variations in temperature, humidity, light, and water chemistry create the conditions for life to flourish in remarkable diversity. Protecting these microclimates means protecting the biodiversity, ecosystem services, and ecological processes that make swamps such irreplaceable components of our planet's natural heritage.
For more information about wetland ecosystems and their conservation, visit the U.S. Environmental Protection Agency's wetlands page or explore resources from The Ramsar Convention on Wetlands, an international treaty for wetland conservation. The National Geographic Society also provides excellent educational resources about wetlands and their ecological importance.