Lakes
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Lakes
Lakes are complex freshwater ecosystems shaped by interactions among climate, geology, hydrology, nutrients, sediments, aquatic organisms, and surrounding watersheds. They range from small mountain lakes and shallow productive basins to enormous ancient lakes and inland seas. Lakes provide habitat for diverse plants and animals while supplying drinking water, fisheries, recreation, transportation, cultural resources, and other benefits to human societies.
Scientific research increasingly treats lakes as integrated ecosystems rather than isolated bodies of water. Conditions within a lake can reflect changes occurring throughout its watershed, including agriculture, urban development, pollution, water withdrawals, invasive species, and climate change. Because lakes respond to environmental disturbances in measurable ways, they can also serve as important indicators of broader ecological change.
Lake Ecology and Limnology
Limnology is the scientific study of inland waters, including lakes, reservoirs, rivers, ponds, and wetlands. Lake scientists investigate physical characteristics such as depth, temperature, circulation, and stratification together with chemical and biological processes involving nutrients, oxygen, sediments, microorganisms, plants, plankton, fish, and other organisms.
Lake characteristics vary greatly according to geology, elevation, climate, watershed size, water residence time, and connections with groundwater and rivers. Some lakes are naturally nutrient-poor and exceptionally clear, while others are naturally productive and contain abundant algae and aquatic vegetation.
Seasonal changes strongly influence lake ecosystems. Temperature differences can divide lakes into distinct layers, while seasonal mixing redistributes oxygen and nutrients. These physical processes influence biological productivity, nutrient cycling, food webs, and the distribution of aquatic organisms.
Whole-lake experiments and long-term monitoring programs have become particularly valuable for understanding freshwater ecosystems. Research facilities such as Canada's Experimental Lakes Area demonstrate how scientists can examine pollution, nutrients, contaminants, climate change, and ecological recovery at the scale of entire ecosystems.
Water Quality, Nutrients, and Eutrophication
Water quality is closely connected to activities occurring throughout a lake's watershed. Nitrogen, phosphorus, sediments, contaminants, and other substances can enter lakes through agricultural runoff, wastewater, stormwater, atmospheric deposition, groundwater, and industrial or urban development.
Nitrogen and phosphorus are essential nutrients, but excessive concentrations can stimulate unusually high biological productivity. This process, known as eutrophication, occurs naturally as lakes age but can be greatly accelerated by human nutrient inputs.
Excessive nutrient enrichment can increase algae and aquatic plant growth, reduce water clarity, alter biological communities, and contribute to oxygen depletion as organic material decomposes. These changes can damage fish habitat, interfere with recreation, affect drinking-water supplies, and fundamentally alter lake ecosystems.
Lake restoration therefore frequently requires action throughout the surrounding watershed. Reducing fertilizer losses, controlling agricultural and urban runoff, improving wastewater treatment, protecting shoreline vegetation, maintaining septic systems, and reducing erosion can decrease the amount of nutrients and sediment entering lakes.
Harmful Algal Blooms and Hypoxia
Harmful algal blooms are an increasingly important water-quality problem in freshwater ecosystems. Certain cyanobacteria can multiply rapidly under favorable combinations of nutrients, warm temperatures, sunlight, and relatively stable water conditions.
Some cyanobacterial blooms produce toxins capable of harming people, pets, livestock, wildlife, and aquatic organisms. Large blooms can also interfere with recreation and drinking-water treatment.
Decomposition of abundant algae consumes dissolved oxygen. In severe cases, bottom waters can become hypoxic, meaning that oxygen concentrations fall low enough to damage aquatic organisms. Lake Erie provides a prominent example where nutrient enrichment, harmful algal blooms, invasive mussels, sediment processes, and seasonal hypoxia interact.
Scientists increasingly combine satellites, monitoring buoys, water sampling, laboratory analysis, and computer models to detect blooms and forecast their development. Nutrient reduction remains one of the most important long-term approaches for controlling eutrophication, harmful blooms, and oxygen depletion.
Climate Change and Warming Lakes
Lakes are sensitive indicators of climate change because their temperatures, water levels, ice cover, mixing patterns, evaporation rates, and biological communities respond to changing climatic conditions.
Long-term observations indicate that warming can increase surface-water temperatures and alter thermal stratification. In some deep lakes, stronger or longer-lasting stratification may reduce the frequency with which oxygen-rich surface water mixes with deeper water.
Climate change can also interact with existing environmental pressures. Warmer temperatures may intensify eutrophication and harmful algal blooms, while changes in precipitation, drought, snowpack, runoff, and evaporation can substantially alter lake levels and water chemistry.
Mountain and high-latitude lakes can be especially sensitive. Changes in snowfall, snowmelt, permafrost, atmospheric deposition, and ice duration can affect ecosystems that historically experienced cold and relatively stable environmental conditions.
Lake Ice and Seasonal Change
Lake ice is an important component of cold-region ecosystems. The timing of freezing and thawing influences aquatic habitat, winter ecology, transportation, recreation, water temperature, and interactions between lakes and the atmosphere.
Long-term records of lake ice provide valuable evidence of climatic change. Earlier spring thaw and later winter freezing can lengthen the ice-free season and alter ecological processes within lakes.
Changes in ice cover are particularly important in the Great Lakes, where large bodies of water strongly influence regional weather. Reduced or changing ice conditions can affect evaporation, lake temperatures, storms, lake-effect snowfall, and aquatic ecosystems.
Biodiversity and Food Webs
Lakes support remarkable biological diversity. Their communities can include microorganisms, algae, aquatic plants, insects, crustaceans, mollusks, amphibians, fishes, birds, and mammals connected through complex food webs.
Some ancient and geographically isolated lakes contain exceptionally high numbers of endemic species found nowhere else. Lake Baikal, Lake Malawi, and Lake Tanganyika are prominent examples of lakes with extraordinary evolutionary and biological significance.
Lake Malawi is particularly famous for the diversification of cichlid fishes, while Lake Tanganyika supports an exceptionally diverse assemblage of fishes, mollusks, and other aquatic organisms. Kenya's Rift Valley lakes provide globally important habitat for flamingos, pelicans, and other waterbirds.
Freshwater biodiversity nevertheless faces substantial pressures from habitat alteration, pollution, dams, water extraction, overharvesting, invasive species, nutrient enrichment, and climate change.
Invasive Species and Changing Food Webs
Introduced aquatic species can fundamentally reorganize lake ecosystems. Boats, fishing equipment, bait, canals, interconnected waterways, and deliberate or accidental introductions can transport organisms beyond their native ranges.
The Great Lakes provide some of the world's best-documented examples. Sea lamprey, alewife, zebra mussels, quagga mussels, and numerous other introduced organisms have altered fisheries, nutrient cycling, habitat, food webs, and native biological communities.
Invasive species can interact with pollution, eutrophication, fisheries management, and climate change. These interactions make their ecological effects difficult to predict and can complicate restoration efforts.
Monitoring programs and databases increasingly help scientists identify invasion pathways and determine which lakes are particularly vulnerable. Research suggests that factors such as boating activity, recreational access, lake size, environmental conditions, and the presence of existing invasive species can help predict future invasions.
Lake Restoration and Conservation
Restoring degraded lakes usually requires addressing the causes of ecological change rather than treating individual symptoms. Because lakes receive water and materials from surrounding landscapes, effective restoration frequently requires watershed-scale management.
Restoration strategies can include reducing external nutrient loading, controlling erosion, improving wastewater treatment, restoring wetlands and shorelines, managing stormwater, removing contaminated sediment, manipulating fish communities, controlling invasive species, and protecting natural vegetation.
Some restoration techniques can improve conditions temporarily without eliminating the underlying problem. For example, manipulating fish communities may improve water clarity in shallow eutrophic lakes, but improvements may not persist when excessive nutrient inputs continue.
Long-term monitoring is therefore essential. Scientists must determine whether restoration measures are producing lasting changes in water quality, biodiversity, habitat, and ecosystem functioning.
Great Lakes
The Laurentian Great Lakes form one of the world's largest freshwater systems. They provide drinking water, transportation, fisheries, recreation, industry, habitat, and other ecological and economic services across the United States and Canada.
The Great Lakes have also experienced extensive environmental change caused by industrial pollution, nutrient enrichment, invasive species, shoreline modification, habitat loss, fishing pressure, and climate change.
Lake Erie has experienced recurring eutrophication, harmful algal blooms, and oxygen depletion, while Lakes Michigan and Ontario have undergone major food-web changes associated with invasive species and fisheries management.
Extensive binational monitoring, research, pollution-control, habitat-restoration, and invasive-species programs have consequently developed around the Great Lakes.
African Great Lakes
Africa contains some of the world's most biologically and geologically remarkable lakes. Lake Victoria, Lake Tanganyika, Lake Malawi, and the lakes of the East African Rift support extraordinary biodiversity while providing food, water, transportation, employment, and livelihoods for millions of people.
Lake Tanganyika contains exceptional freshwater biodiversity but faces pressures from pollution, sedimentation, habitat degradation, resource exploitation, and climate change.
Lake Victoria and its surrounding basin experience interacting pressures associated with population growth, agriculture, water use, pollution, fisheries, biodiversity change, and climate.
Regional institutions increasingly emphasize cooperation because many African lakes and their watersheds cross national boundaries. Effective management therefore depends on coordination among countries sharing these freshwater resources.
Saline Lakes and the Great Salt Lake
Saline and terminal lakes differ from many freshwater lakes because water enters their basins but has little or no surface outlet. Evaporation concentrates dissolved minerals and produces distinctive chemical and ecological conditions.
Great Salt Lake is an important example. Its water levels and salinity are influenced by precipitation, snowpack, river inflows, evaporation, climate variability, and human water withdrawals.
Although saline lakes may appear biologically simple, they can support highly productive food webs involving microorganisms, brine shrimp, brine flies, and enormous populations of migratory birds.
Declining inflows, water diversion, drought, and climate change threaten many saline lakes, making sustainable water allocation a major conservation challenge.
Lake Tahoe and Mountain Lakes
Mountain lakes are often cold, clear, nutrient-poor ecosystems influenced by snowmelt, geology, atmospheric deposition, elevation, and climate. Their relatively low nutrient concentrations can make them particularly sensitive to environmental change.
Lake Tahoe is among the world's best-studied mountain lakes. Long-term research tracks water clarity, temperature, mixing, nutrients, algae, invasive species, sediment, snowpack, and watershed conditions.
Protecting Tahoe's exceptional clarity requires management beyond the lake itself. Fine sediments and nutrients entering from roads, development, streams, runoff, and surrounding landscapes can influence water quality.
Other mountain lakes in places such as the Sierra Nevada, Rocky Mountains, North Cascades, and Glacier National Park similarly provide valuable indicators of changing snowpack, atmospheric pollution, warming, and ecological conditions.
Famous and Exceptional Lakes
Individual lakes often illustrate broader ecological and geological processes. Crater Lake demonstrates the characteristics of a deep volcanic caldera lake, while Yellowstone Lake combines high elevation, volcanic geology, and important native fish habitat.
Lake Baikal is notable for its exceptional age, depth, and endemic biodiversity. Lake Malawi demonstrates rapid evolutionary diversification, particularly among cichlid fishes.
Lake Naivasha illustrates the challenge of balancing intensive human use with ecological sustainability. Lake Powell demonstrates how large reservoirs can alter sediment, phosphorus, salinity, and other characteristics of river systems.
These examples show that lakes are not ecologically interchangeable. Their origins, geology, climate, hydrology, biodiversity, and histories of human use strongly influence both their environmental condition and appropriate management strategies.
Human Uses and the Future of Lakes
Human societies depend heavily on lakes for drinking water, irrigation, fisheries, aquaculture, transportation, recreation, energy, tourism, cultural traditions, and economic development.
These uses can also place substantial pressure on freshwater systems. Water withdrawals, dams, pollution, shoreline development, agriculture, urbanization, invasive species, and climate change can interact to degrade lake ecosystems.
Sustainable lake management increasingly emphasizes entire watersheds and catchments rather than individual shorelines. Protecting a lake may require managing upstream agriculture, forests, cities, groundwater, wetlands, rivers, wastewater, and water withdrawals.
International conservation programs increasingly recognize lakes as essential components of global freshwater and biodiversity protection. Effective management depends on scientific monitoring, pollution prevention, habitat conservation, sustainable water allocation, restoration, regional cooperation, and participation by communities that depend upon lake resources.
Conclusion
Lakes are dynamic ecosystems connecting water, land, atmosphere, biodiversity, and human societies. Their condition reflects both natural processes and environmental pressures occurring throughout their watersheds.
Nutrient pollution, harmful algal blooms, invasive species, habitat alteration, excessive water extraction, and climate change are among the most significant challenges facing lakes worldwide. These pressures frequently interact, making lake conservation a complex ecological and social problem.
Research from the Great Lakes, African Great Lakes, Great Salt Lake, Lake Tahoe, mountain lakes, and long-term experimental systems demonstrates that protecting lakes requires sustained monitoring and management at the watershed scale. Reducing pollution, conserving freshwater biodiversity, maintaining natural hydrology, restoring degraded habitats, and adapting management to climate change will be central to preserving lake ecosystems and the services they provide for future generations.
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Lake Science, Ecology, and Limnology
| U.S. Environmental Protection Agency | EPA Watershed Academy | 2026
An educational introduction to lake ecology explains lake basins, aquatic organisms, physical and chemical variability, nutrients, eutrophication, and water-quality management.
| Aarhus University | Department of Ecoscience | 2026
Freshwater researchers investigate lake ecology, nutrient cycling, sediments, climate change, restoration, Arctic lakes, and long-term lake monitoring.
| BOKU University | Institute of Hydrobiology and Aquatic Ecosystem Management | 2026
International limnology training integrates aquatic ecology, lake ecology, wetland management, fisheries, bioassessment, modeling, and freshwater conservation.
| University of Southampton | University of Southampton | 2026
Researchers investigate how degraded lakes recover from pollution and other environmental pressures and how ecological resilience and tipping points influence restoration.
| U.S. Environmental Protection Agency | EPA | 2025
The National Lakes Assessment provides nationally consistent data on the biological, chemical, recreational, and physical condition of lakes, ponds, and reservoirs across the United States.
| U.S. Environmental Protection Agency | EPA | 2025
EPA's 2022 assessment found nutrient pollution, excessive algae, cyanobacteria, shoreline disturbance, and contaminants remain major pressures affecting American lakes.
| National Park Service | National Park Service | 2025
Scientists monitor dozens of Sierra Nevada lakes to detect changes in chemistry, nutrients, algae, amphibians, and other indicators of ecological condition.
| U.S. Environmental Protection Agency | EPA | 2024
An interactive national report examines nutrients, biological communities, habitat, algal toxins, pesticides, fish contaminants, and changes in lake condition over time.
| National Park Service | National Park Service | 2024
Lakes and ponds support diverse aquatic communities and can serve as sensitive indicators of climate change, pollution, land use, and other environmental disturbances.
Research on hundreds of Alaskan lakes shows how geology, permafrost, hydrology, and landscape setting influence lake depth, nutrients, chemistry, and climate vulnerability.
| National Park Service | National Park Service | 2021
Lake Clark demonstrates the ecological connections among freshwater lakes, rivers, salmon, wetlands, forests, wildlife, and coastal ecosystems.
| National Park Service | National Park Service | 2019
High-latitude lakes integrate water, energy, nutrients, sediment, and pollutants and provide important indicators of environmental change.
| U.S. Geological Survey | USGS Water Science School | 2018
Lakes and reservoirs are complex aquatic ecosystems shaped by climate, geology, groundwater, runoff, nutrients, sediments, and their surrounding watersheds.
| U.S. Geological Survey | USGS | 2018
A field manual reviews basic limnology and explains how scientists design monitoring programs and collect physical, chemical, sediment, and biological information from lakes and reservoirs.
| Stephen R. Carpenter et al. | Ecological Monographs | 2001
Whole-lake experiments reveal how nutrient enrichment and changes in food webs can cascade through zooplankton, algae, bacteria, productivity, and carbon cycling.
| L. J. Britton, R. C. Averett and R. F. Ferreira | U.S. Geological Survey | 1975
Urban lakes are influenced by interacting physical, chemical, and biological processes including mixing, nutrient cycling, photosynthesis, respiration, sedimentation, and human land use.
| Flathead Lake Biological Station | University of Montana | n.d.
Decades of research at Flathead Lake examine temperature, nutrients, sediments, contaminants, aquatic organisms, invasive species, and long-term environmental change.
| University of Wisconsin–Stevens Point | Extension Lakes | n.d.
Educational materials explain basic lake ecology, shoreland habitats, aquatic plants, lake classification, erosion, water-quality data, and ecological landscaping.
| Egerton University | Egerton University | n.d.
Tropical freshwater education in Kenya emphasizes lake ecology, aquatic organisms, water quality, wetlands, fisheries, and management of East African aquatic ecosystems.
| International Institute for Sustainable Development | IISD Experimental Lakes Area | n.d.
Whole-lake experiments allow scientists to study ecological processes and environmental threats under realistic ecosystem conditions rather than relying solely on laboratory experiments.
Water Quality, Nutrients, and Eutrophication
| U.S. Geological Survey | USGS | 2026
Scientists are examining water-quality conditions in terminal lakes of the Great Basin, including salinity, dissolved oxygen, pH, ions, turbidity, and temperature.
| Environment Agency | GOV.UK | 2026
Research on Windermere examines how climate change and nutrient loading could alter phytoplankton and lake water quality and evaluates possible management responses.
| Environment Agency | GOV.UK | 2026
A detailed modeling study assesses interactions among climate, nutrient inputs, catchment processes, and future ecological conditions in Windermere.
| U.S. Environmental Protection Agency | EPA | 2025
Nitrogen and phosphorus accumulate particularly easily in slow-moving waters and lakes, increasing risks of algae growth, oxygen depletion, drinking-water problems, and ecological degradation.
| U.S. Environmental Protection Agency | EPA | 2025
The 2017 National Lakes Assessment found widespread phosphorus and nitrogen pollution associated with degraded biological communities and excessive algal productivity.
| Jeri Stoller and Emily Stahl Pasek | National Park Service | 2023
Researchers developed assessment points for determining when atmospheric nitrogen deposition begins altering sensitive high-elevation lake ecosystems.
| U.S. Geological Survey | USGS | 2022
Interactive measurements from Bear Lake show how temperature, oxygen, chlorophyll, conductivity, pH, phycocyanin, and turbidity change with depth and time.
| W. Reed Green et al. | U.S. Geological Survey | 2021
A screening tool evaluates lake susceptibility to eutrophication using nutrient loading, flushing rate, water clarity, chlorophyll, microcystin, and lake morphology.
| Multiple Authors | Critical Reviews in Environmental Science and Technology / EPA HERO | 2021
A global review finds that successful shallow-lake restoration usually requires substantial reductions in external nutrient loading combined with lake-specific restoration measures.
| Manqi Chang et al. | Science of the Total Environment / USGS | 2019
The GPLake model uses lake depth, residence time, nutrient loading, light, and phytoplankton relationships to provide managers with rapid assessments of eutrophication risk.
| Environment Agency | GOV.UK | 2012
Diatoms can provide biological indicators for evaluating ecological quality and detecting environmental changes in rivers and lakes.
| U.S. Geological Survey | USGS | 2011
Lake Crescent's exceptionally nutrient-poor water makes the ecosystem vulnerable to relatively small increases in nitrogen and phosphorus.
| Erik Jeppesen et al. | Journal of Applied Ecology / EPA HERO | 2007
Long-term restoration studies show that removing excessive fish biomass can temporarily improve shallow eutrophic lakes, although recovery may reverse if nutrient loads remain high.
| Paul F. Woods | U.S. Geological Survey | 1997
Research at Payette Lake examines nutrient concentrations, periphyton, aquatic plants, oxygen depletion, water residence time, and the potential for future eutrophication.
| W. Rast and M. Holland | Ambio / USGS | 1988
A management framework connects scientific understanding of eutrophication with water-quality objectives, economic considerations, public involvement, and policy choices.
| Phillip E. Greeson | Journal of the American Water Resources Association / USGS | 1969
Eutrophication is a natural component of lake aging, but human nutrient inputs can greatly accelerate enrichment, biological productivity, oxygen depletion, and sediment accumulation.
| Alfred M. Beeton | Limnology and Oceanography / USGS | 1965
Historical evidence documents human-accelerated eutrophication and ecological change in portions of the Great Lakes, particularly shallow and productive Lake Erie.
| U.S. Environmental Protection Agency | EPA | n.d.
Excess nitrogen and phosphorus entering freshwater systems can stimulate excessive algal growth, degrade habitat, reduce oxygen, and impair drinking and recreational waters.
| U.S. Environmental Protection Agency | EPA | n.d.
Agriculture, wastewater, stormwater, industry, and atmospheric deposition are major pathways by which excessive nutrients reach rivers and lakes.
| U.S. Geological Survey | USGS | n.d.
Continuous monitoring of Lake Houston tracks temperature, conductivity, dissolved oxygen, turbidity, nutrients, sediment, and effects of watershed development.
Harmful Algal Blooms and Hypoxia
| Joey Simoes and Richard Grosshans | International Institute for Sustainable Development | 2026
Canadian research finds that carefully designed water-retention projects can reduce phosphorus delivery and help limit algal blooms in downstream lakes.
| NOAA National Centers for Coastal Ocean Science | NOAA | 2026
Operational forecasts predict when oxygen-depleted bottom water in Lake Erie could move toward shore and threaten aquatic habitat and drinking-water intakes.
Harmful algal blooms occur in both marine and freshwater environments and can damage ecosystems, public health, recreation, and regional economies.
| Rachel A. Fowler et al. | National Park Service | 2024
Scientists studying Acadia National Park lakes are developing early-warning approaches for harmful cyanobacterial blooms that threaten recreation and drinking water.
Citizen scientists are being trained to identify potentially harmful cyanobacteria and expand water-quality monitoring in freshwater lakes.
| International Society of Limnology | SIL | 2024
A collection of open-access freshwater research covers lake oxygen, trophic state, nutrient cycling, lake modeling, algae, ponds, and climate effects.
Weekly sampling in Lake Erie and Saginaw Bay helps scientists track cyanobacteria, toxins, nutrient concentrations, oxygen conditions, and bloom development.
| United Nations Environment Programme | UNEP | 2023
The uP-Cycle project explores ways to reduce phosphorus movement from land into lakes and restore freshwater ecosystems damaged by nutrient pollution.
| National Park Service | National Park Service | 2022
Nutrient enrichment and warming are changing benthic algae in alpine lakes and may lead to declining water clarity and broader ecological change.
| University of Michigan | Michigan News | 2021
Phosphorus released from Lake Erie sediments during hypoxia may reinforce algal growth and oxygen depletion, creating a feedback that warming could intensify.
| Stuart A. Ludsin et al. | Canadian Journal of Fisheries and Aquatic Sciences / NOAA | 2020
Research shows that Lake Erie hypoxia alters fish habitat, feeding behavior, energetic condition, distribution, predation risk, and long-term population dynamics.
Research examines how phosphorus, invasive mussels, climate variability, phytoplankton, zooplankton, and fish interact to create Lake Erie's recurring hypoxic zone.
Research links Lake Erie's renewed eutrophication to phosphorus loading, changing agricultural practices, invasive mussels, warming, cyanobacterial blooms, and low oxygen.
| NOAA | National Marine Ecosystem Status | n.d.
NOAA monitors ecological conditions in the Great Lakes, including recurring cyanobacterial blooms in western Lake Erie.
| U.S. Environmental Protection Agency | EPA | n.d.
Cyanobacterial harmful algal blooms can produce toxins and create risks for people, pets, livestock, wildlife, and aquatic ecosystems.
| U.S. Environmental Protection Agency | EPA | n.d.
Nutrient enrichment, warm temperatures, and favorable environmental conditions can promote harmful algal blooms in lakes and other freshwater environments.
| NOAA Great Lakes Environmental Research Laboratory | NOAA | n.d.
The International Field Years on Lake Erie program investigates harmful algal blooms, hypoxia, food webs, invasive species, and ecological forecasting.
Lake Erie research seeks to predict dead zones, harmful algal blooms, fish production, habitat quality, and interactions among environmental stressors.
Multidisciplinary projects examine Lake Erie phytoplankton, zooplankton, phosphorus cycling, mussels, oxygen depletion, food webs, primary production, and remote sensing.
| NOAA Great Lakes Environmental Research Laboratory | NOAA | n.d.
NOAA combines satellites, buoys, water sampling, genetic analysis, and models to understand and forecast Great Lakes harmful algal blooms and hypoxia.
Climate Change and Warming Lakes
| Abigail S. Lewis et al. | Limnology and Oceanography Letters / USGS | 2026
Global environmental change is altering lake seasons, including ice cover, thermal conditions, precipitation patterns, and plankton phenology.
| Abigail S. Lewis et al. | Limnology and Oceanography Letters | 2026
A global synthesis demonstrates that changing definitions and timing of seasons can substantially alter scientists' interpretation of lake ecosystem conditions.
| Catherine O'Reilly | UC Davis Tahoe Environmental Research Center | 2026
Long-term observations show that lakes act as climate sentinels because changes in temperature, clarity, productivity, ice, and food webs can reveal broader environmental warming.
| Mathew Wells et al. | Limnology and Oceanography / USGS | 2025
Year-round observations suggest Lake Ontario mixes differently than traditionally assumed, with important implications for oxygen, nutrients, winter ecology, and climate modeling.
| NOAA | National Marine Ecosystem Status | 2025
Long-term indicators track Lake Superior surface temperature, heatwaves, ecosystem condition, habitat, and other environmental changes.
| NOAA | National Marine Ecosystem Status | 2025
NOAA monitoring documents long-term Lake Michigan temperature and ecosystem trends, including evidence of increasing surface temperatures in recent years.
| Morgan Sherburne | University of Michigan News | 2024
Record-early ice loss at Douglas Lake illustrates how exceptionally warm winters and long-term climate warming are shortening ice seasons.
| ISIMIP Lake Sector researchers | U.S. Geological Survey | 2022
A global modeling framework was developed to predict climate-driven changes in lake temperature, thermal structure, and biogeochemistry.
| USGS researchers | U.S. Geological Survey | 2021
Climate modeling of thousands of lakes predicts reduced ice cover and snowpack, increased evaporation, and substantial changes in lake water levels.
| EPA researchers | U.S. Environmental Protection Agency | 2021
Modeling indicates that climate warming can substantially change surface temperature, stratification, and mixing regimes in lakes and reservoirs.
| James E. McKenna | Fisheries Management and Ecology / USGS | 2019
Climate change compounds habitat degradation, invasive species, overfishing, and other ecological pressures already affecting the Laurentian Great Lakes.
| X. H. Xia et al. | Journal of Environmental Informatics / EPA HERO | 2015
A review examines how climate change can influence eutrophication, salinization, pollutants, aquatic species, and water quality in lakes and other waters.
| Erik Jeppesen et al. | Journal of Limnology / EPA HERO | 2014
Multiple lines of evidence show how warming can amplify eutrophication, alter food webs, change water levels, and affect biological communities in shallow lakes.
| USGS researchers | U.S. Geological Survey | 2012
Modeling suggests warming could eventually prevent Lake Tahoe from mixing to its bottom regularly, with major consequences for oxygen and nutrient cycling.
| Brian Moss et al. | Hydrological Sciences Journal / EPA HERO | 2009
Climate-driven drought, floods, altered runoff, invasive species, and longer water residence times can substantially affect freshwater and lake water quality.
| M. D. MacKay et al. | Limnology and Oceanography / USGS | 2009
Lakes both influence regional climate and respond to climate variability, creating important interactions among atmosphere, water temperature, mixing, evaporation, and aquatic ecology.
| UC Davis Tahoe Environmental Research Center | UC Davis | n.d.
Annual State of the Lake reports track Lake Tahoe temperature, clarity, mixing, snowpack, nutrients, algae, invasive species, food webs, and climate-driven ecosystem change.
| University of Wisconsin–Madison | UW–Madison | n.d.
Decades of freshwater research examine climate impacts on lake ice, fishes, invasive species, thermal ecology, and long-term lake dynamics.
| University of Wisconsin–Madison | UW–Madison | n.d.
Lake scientist Hilary Dugan studies freshwater responses to climate change, lake ice, atmospheric influences, and changing water quality.
| University of Wisconsin–Madison | UW–Madison | n.d.
Research on inland lakes and Great Lakes fisheries investigates how climate warming changes fish habitat, food webs, recreational fisheries, and aquatic ecology.
Lake Ice and Winter Ecology
| U.S. Environmental Protection Agency | EPA | n.d.
Long-term records of lake freezing and thawing provide sensitive indicators of changing winter temperatures and regional climate.
| NOAA Great Lakes Environmental Research Laboratory | NOAA | n.d.
Great Lakes ice-cover data document seasonal and long-term variations associated with weather and climate.
Satellite and observational data provide information about Great Lakes temperatures, ice conditions, water levels, and other physical characteristics.
The Great Lakes Coastal Forecasting System models currents, temperatures, water levels, waves, and ice throughout the Great Lakes.
Long-term Great Lakes water-level records reveal natural fluctuations and responses to precipitation, evaporation, runoff, and climate.
| National Park Service | National Park Service | n.d.
Lake ice influences aquatic habitat, seasonal ecology, transportation, recreation, and physical processes in cold-region ecosystems.
| NASA | NASA Global Climate Change | n.d.
NASA observations and research provide context for understanding warming, changing snow and ice, and hydrological changes influencing lakes worldwide.
| NASA Earth Observatory | NASA | n.d.
Satellite observations track changes in Earth's freshwater resources, including lakes, reservoirs, wetlands, snow, drought, and flooding.
| NASA Earth Observatory | NASA | n.d.
Earth-observing satellites reveal striking changes in lakes caused by drought, climate variation, irrigation, dam construction, and other human activities.
| National Park Service | National Park Service | n.d.
Lake temperature, ice duration, mixing, oxygen availability, and biological communities can all respond rapidly to climate change.
| NOAA Great Lakes Environmental Research Laboratory | NOAA | n.d.
Satellite-based Great Lakes statistics provide measurements of surface temperature and ice conditions useful for climate and ecosystem analysis.
Historical ice observations provide a long-term record of how winter conditions vary across individual Great Lakes.
| NASA | NASA Global Climate Change | n.d.
Long-term global warming affects lake temperatures, evaporation, watershed hydrology, snowpack, and ice-cover duration.
| NASA Earth Observatory | NASA | n.d.
Satellite measurements of Earth's surface temperature help scientists study climatic conditions influencing lake heating, evaporation, and ice.
| National Snow and Ice Data Center | NSIDC | n.d.
Lake and river ice are important components of the cryosphere whose timing and duration respond strongly to temperature and climate.
| NOAA | National Weather Service | n.d.
Large lakes can strongly influence local winter weather by supplying heat and moisture that generate lake-effect snowfall.
| Great Lakes Integrated Sciences and Assessments | University of Michigan | n.d.
Climate change in the Great Lakes region is altering temperatures, precipitation, winter conditions, evaporation, water levels, and ecosystem processes.
Lake Biodiversity and Conservation
| United Nations Environment Programme | UNEP | 2025
UNEP outlines the ecological and societal importance of protecting, managing, and restoring the planet's freshwater ecosystems.
| United Nations Environment Programme | UNEP | 2024
Freshwater ecosystems are threatened by pollution, land-use change, nutrient runoff, overexploitation, biodiversity loss, and climate change.
| United Nations Environment Programme | UNEP | 2024
Lakes, rivers, wetlands, and groundwater systems sustain human societies but rank among Earth's most threatened ecosystems.
| United Nations Environment Programme | UNEP | 2023
Lakes contain most of the planet's unfrozen surface freshwater and support biodiversity while providing important water, food, climatic, and cultural services.
| UNESCO World Heritage Centre | UNESCO | n.d.
Kenya's Rift Valley lake system supports extraordinary concentrations of birds and provides globally important habitat for lesser flamingos and great white pelicans.
| UNESCO World Heritage Centre | UNESCO | n.d.
Lake Baikal is the world's oldest and deepest lake and contains an exceptionally large number of endemic freshwater species.
| UNESCO World Heritage Centre | UNESCO | n.d.
Lake Malawi contains extraordinary fish diversity and is particularly famous for rapid evolution and diversification of endemic cichlid fishes.
| UNESCO World Heritage Centre | UNESCO | n.d.
The African Great Rift Valley's lakes and surrounding habitats illustrate important geological and biological processes.
| International Union for Conservation of Nature | IUCN | n.d.
Freshwater species face disproportionately high extinction risks from habitat alteration, pollution, invasive species, dams, water extraction, and climate change.
| World Wildlife Fund | WWF | n.d.
Freshwater habitats, including lakes, support exceptional biodiversity while supplying water, food, transportation, livelihoods, and other ecosystem services.
| International Union for Conservation of Nature | IUCN Red List | n.d.
Global assessments show particularly high extinction risks among many freshwater fishes, mollusks, crustaceans, amphibians, and other aquatic organisms.
| World Wildlife Fund | WWF | n.d.
Freshwater conservation programs seek to protect rivers, lakes, wetlands, wildlife, and water supplies while improving sustainable management.
| Conservation International | Conservation International | n.d.
Protecting freshwater ecosystems requires connecting biodiversity conservation with watershed management, human water security, and sustainable development.
| Freshwater Life | Freshwater Biological Association | n.d.
Freshwater information resources provide research, datasets, species information, and educational material concerning lakes, rivers, ponds, and wetlands.
| Freshwater Biological Association | FBA | n.d.
The Freshwater Biological Association supports research and conservation addressing freshwater biodiversity, ecological monitoring, invasive species, and environmental change.
| WWF India | World Wildlife Fund | n.d.
Freshwater conservation programs address water use, river basins, wetlands, lakes, pollution, biodiversity, and sustainable management.
| United Nations Environment Programme | UNEP | n.d.
Protecting lakes and other freshwater ecosystems requires reducing pollution, maintaining environmental flows, restoring habitats, and improving monitoring and governance.
| Convention on Biological Diversity | United Nations | n.d.
International biodiversity agreements recognize inland waters—including lakes—as ecosystems requiring conservation, restoration, sustainable use, and improved biodiversity monitoring.
| Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services | IPBES | n.d.
Global biodiversity assessments document widespread degradation of freshwater habitats and provide evidence for stronger ecosystem conservation and restoration.
Lake Restoration and Management
| United Nations Environment Programme | UNEP | 2026
Managing entire catchments can address the interacting impacts of pollution, water extraction, agriculture, development, and climate change on rivers and lakes.
| Emma Polauke | University of Southern Denmark | 2026
Research on Danish lakes evaluates phosphorus immobilization, sediment dredging, fish-community manipulation, and carbon cycling as tools for restoring eutrophic lakes.
| United Nations Environment Programme | UNEP | 2025
Many lakes worldwide are shrinking, becoming polluted, or experiencing ecological decline from water diversion, climate change, nutrient pollution, and overuse.
| Sumeep Bath, Vince Palace and Chelsea Rochman | IISD | 2025
Canada's Experimental Lakes Area demonstrates the importance of whole-lake experiments for understanding pollution, climate change, contaminants, and ecosystem recovery.
| United Nations Environment Programme | UNEP | 2024
UN monitoring indicates freshwater ecosystems are degrading across much of the world as surface waters shrink, pollution increases, and river flows change.
| Inger Andersen | UNEP | 2023
Sustainable lake management requires stronger protection, transboundary cooperation, ecosystem restoration, and increased investment in nature-based solutions.
| United Nations Environment Programme | UNEP | 2022
The UN Environment Assembly's sustainable lake management resolution calls for coordinated international action to protect lakes from pollution and environmental degradation.
| International Institute for Sustainable Development | IISD Experimental Lakes Area | n.d.
The Experimental Lakes Area consists of dozens of lakes and watersheds used for long-term monitoring and whole-ecosystem freshwater experiments.
| U.S. Environmental Protection Agency | EPA | n.d.
Restoration projects demonstrate how reducing runoff, nutrients, sediment, and other nonpoint pollution can improve lakes and connected waterways.
| U.S. Environmental Protection Agency | EPA | n.d.
EPA resources address lake monitoring, pollution control, ecosystem health, water-quality standards, restoration, and public protection.
| U.S. Geological Survey | USGS | n.d.
USGS research investigates lake hydrology, chemistry, ecosystems, water supply, climate responses, contaminants, and management challenges.
| U.S. Environmental Protection Agency | EPA | n.d.
A comprehensive restoration manual examines methods for controlling nutrients, sediments, aquatic plants, algae, oxygen problems, shoreline degradation, and other lake impairments.
| U.S. Environmental Protection Agency | EPA | n.d.
Watershed-based management recognizes that restoring a lake often requires addressing environmental pressures throughout the entire drainage basin.
| U.S. Environmental Protection Agency | EPA | n.d.
Reducing fertilizer losses, managing runoff, maintaining septic systems, and protecting vegetation can help limit nutrient pollution reaching lakes.
| IISD Experimental Lakes Area | IISD | n.d.
Whole-ecosystem experiments investigate how freshwater systems respond to pollutants, nutrients, climate change, pharmaceuticals, microplastics, and restoration measures.
| IISD Experimental Lakes Area | IISD | n.d.
More than five decades of research at Canada's Experimental Lakes Area provide evidence about how entire lake ecosystems respond to environmental disturbance and recovery.
| U.S. Environmental Protection Agency | EPA | n.d.
Nutrient-reduction programs seek to limit nitrogen and phosphorus entering freshwater systems through agriculture, wastewater, stormwater, and watershed management.
| United Nations Environment Programme | UNEP | n.d.
Ecosystem restoration aims to reverse degradation of freshwater and other ecosystems while improving biodiversity, water security, resilience, and human well-being.
Invasive Species and Changing Food Webs
| U.S. Geological Survey | USGS | 2026
Research at Malheur Lake investigates how invasive carp, sediment resuspension, nutrients, hydrology, and climate contributed to a shift from clear water to a turbid state.
| Jessica L. Weir et al. | Biological Invasions / USGS | 2024
Machine-learning analysis suggests boating activity, lake size, recreational access, and existing invasive species can help predict which lakes are vulnerable to future invasions.
| Ryan C. Burner et al. | Ecosphere / USGS | 2023
Lake-temperature datasets can improve assessments of whether environmental conditions are suitable for introduced aquatic species.
| Alexander Y. Karatayev et al. | Journal of Great Lakes Research / USGS | 2018
Distribution patterns of invasive Dreissena mussels can provide biological evidence of hypoxic conditions in large lakes.
| Scott A. Rush et al. | Freshwater Biology / USGS | 2012
Invasive species changed Lake Ontario food webs enough to alter the energy pathways supporting native lake trout.
| Edward L. Mills et al. | Canadian Journal of Fisheries and Aquatic Sciences / USGS | 2003
Long-term Lake Ontario research documents major food-web changes caused by invasive species, fisheries management, nutrient change, and other human pressures.
| Madeline J. W. Austen et al. | U.S. Geological Survey | 2002
More than a hundred introduced aquatic species have altered Lake Erie habitat, food webs, native organisms, contaminants, and ecosystem functioning.
| LaRue Wells and Alberton L. McLain | Great Lakes Fishery Commission / USGS | 1973
Historical evidence shows how fishing, invasive species, industrial pollution, dams, logging, and habitat degradation altered Lake Michigan fish communities.
Fishing pressure, sea lamprey, alewife, eutrophication, pollution, and habitat alteration transformed Lake Michigan's native salmonid communities.
| U.S. Environmental Protection Agency | EPA | n.d.
Invasive organisms have altered Great Lakes food webs, habitat, nutrient cycling, fisheries, and ecosystem functioning.
| U.S. Fish and Wildlife Service | USFWS | n.d.
Aquatic invasive species can spread among lakes and rivers, displacing native organisms and creating ecological and economic damage.
| U.S. Geological Survey | USGS | n.d.
USGS research examines invasive aquatic organisms and develops tools for prevention, detection, management, and ecological restoration.
| Great Lakes Fishery Commission | GLFC | n.d.
Sea lamprey invasions transformed Great Lakes fish communities and led to one of the world's largest sustained programs of invasive-species control.
| Great Lakes Fishery Commission | GLFC | n.d.
Numerous introduced species have changed Great Lakes ecosystems and continue to pose management challenges.
| U.S. Geological Survey | Great Lakes Science Center | n.d.
Research examines Great Lakes fishes, food webs, invasive species, habitats, contaminants, and ecosystem change.
| U.S. Geological Survey | Nonindigenous Aquatic Species Database | n.d.
A national database tracks introduced fishes, plants, mollusks, crustaceans, and other aquatic organisms found in lakes and waterways.
| National Park Service | National Park Service | n.d.
Aquatic invasive species can be transported between lakes by boats, equipment, bait, animals, and interconnected waterways.
| U.S. Fish and Wildlife Service | USFWS | n.d.
Invasive carp illustrate how introduced fishes can alter freshwater food webs and threaten native species and fisheries.
| U.S. Geological Survey | Nonindigenous Aquatic Species Database | n.d.
The national database documents nonnative freshwater fishes and their distribution, providing information useful for understanding invasion pathways among lakes.
| U.S. Geological Survey | Nonindigenous Aquatic Species Database | n.d.
Records of introduced mollusks help researchers track zebra mussels, quagga mussels, and other organisms capable of transforming lake ecosystems.
Great Lakes
| U.S. Environmental Protection Agency | EPA | n.d.
The Great Lakes contain an enormous share of Earth's surface freshwater and support drinking water, industry, transportation, fisheries, recreation, and biodiversity.
| NOAA | NOAA Education | n.d.
An overview describes Great Lakes geography, ecosystems, food webs, environmental pressures, and their extraordinary freshwater resources.
| NOAA | Great Lakes Environmental Research Laboratory | n.d.
NOAA conducts research on Great Lakes climate, hydrology, harmful algal blooms, ecosystem dynamics, ice, water levels, and physical processes.
| Great Lakes Restoration Initiative | U.S. Federal Agencies | n.d.
The Great Lakes Restoration Initiative funds projects addressing toxic pollution, invasive species, habitat degradation, nutrient runoff, and other ecosystem threats.
| U.S. Fish and Wildlife Service | USFWS | n.d.
Fish and wildlife restoration projects seek to improve Great Lakes wetlands, tributaries, coastal areas, native species, and ecological connectivity.
| U.S. Geological Survey | Great Lakes Science Center | n.d.
Long-term research provides information on Great Lakes fisheries, invasive species, prey fish, food webs, habitats, and environmental change.
| Great Lakes Fishery Commission | GLFC | n.d.
The Great Lakes support internationally managed fisheries whose condition reflects interactions among exploitation, invasive species, habitat, and ecosystem change.
| U.S. Environmental Protection Agency | EPA | n.d.
Coordinated monitoring programs track chemical contaminants, nutrients, biological conditions, and environmental trends throughout the Great Lakes.
| U.S. Environmental Protection Agency | EPA | n.d.
Great Lakes Areas of Concern identify severely degraded locations where governments and communities are working to restore beneficial ecosystem uses.
NOAA research, forecasting, restoration, navigation, and monitoring programs help understand and manage the Great Lakes system.
African Great Lakes
| Multiple Authors | npj Clean Water | 2026
Research examines interacting environmental, social, water, agricultural, and climate pressures across the rapidly changing Lake Victoria Basin.
| Harris Phiri et al. | Journal of Great Lakes Research | 2023
Lake Tanganyika supports exceptional biodiversity and millions of people but faces pollution, sedimentation, habitat loss, resource exploitation, biodiversity decline, and climate change.
| IUCN / UNESCO | UNESCO World Heritage Centre | 2011
The Kenya Lake System combines alkaline lakes, wetlands, volcanic landscapes, bird habitats, and internationally important migratory wildlife populations.
| Egerton University | Egerton University | n.d.
Research on Kenya's Rift Valley lakes investigates phytoplankton productivity, lake ecology, water chemistry, and saline-alkaline aquatic ecosystems.
| Christopher T. Solomon and Ellinor Michel | University of Arizona | n.d.
Research on Lake Tanganyika's littoral zone examines algae, grazers, productivity, trophic interactions, biodiversity, and rocky-shore food webs.
| Lake Tanganyika Biodiversity Project | Global Environment Facility / UNDP | n.d.
Biodiversity surveys identify Lake Tanganyika's extraordinary fish and mollusk diversity and evaluate habitats requiring conservation and management.
| Lake Tanganyika Authority | Lake Tanganyika Authority | n.d.
Burundi, Democratic Republic of Congo, Tanzania, and Zambia cooperate in managing Lake Tanganyika's biodiversity, fisheries, pollution, and shared water resources.
| Lake Victoria Basin Commission | East African Community | n.d.
Regional cooperation seeks to manage Lake Victoria's fisheries, water quality, biodiversity, pollution, economic development, and transboundary natural resources.
Great Salt Lake and Saline Lakes
| U.S. Geological Survey | USGS | n.d.
A major scientific assessment investigates water availability, hydrology, ecology, climate, salinity, and human water use across Great Basin saline lakes.
| U.S. Geological Survey | USGS | n.d.
Scientists study how water diversions, drought, climate change, groundwater, surface flows, and salinity influence terminal lake ecosystems.
| U.S. Geological Survey | USGS | n.d.
Biological research examines brine shrimp, flies, birds, microbial communities, habitat, and food webs of saline lake ecosystems.
| U.S. Geological Survey | USGS | n.d.
Hydrological studies investigate how streams, groundwater, evaporation, precipitation, and human withdrawals determine water levels in terminal lakes.
| U.S. Geological Survey | USGS | n.d.
Climate variability and long-term warming influence evaporation, snowpack, runoff, water levels, salinity, and ecological conditions in closed-basin lakes.
| Utah Department of Natural Resources | State of Utah | n.d.
Great Salt Lake management addresses declining water levels, salinity, wetlands, mineral extraction, recreation, migratory birds, and water conservation.
| Utah Division of Wildlife Resources | Great Salt Lake Ecosystem Program | n.d.
Ecological monitoring focuses on brine shrimp, brine flies, waterbirds, salinity, lake levels, and food-web conditions.
| U.S. Geological Survey | Utah Water Science Center | n.d.
Long-term measurements track Great Salt Lake elevation, inflows, evaporation, salinity, chemistry, and hydrologic change.
| U.S. Fish and Wildlife Service | Bear River Migratory Bird Refuge | n.d.
Wetlands connected to Great Salt Lake provide internationally important feeding and breeding habitat for millions of migratory waterbirds.
| National Audubon Society | Audubon | n.d.
Saline lakes across western North America are essential bird habitats but are threatened by water diversion, drought, declining inflows, and climate change.
Lake Tahoe and Mountain Lakes
| Tahoe Environmental Research Center | University of California, Davis | n.d.
Long-term Lake Tahoe research examines clarity, warming, nutrients, algae, invasive species, mixing, watershed processes, and environmental restoration.
| Tahoe Environmental Research Center | UC Davis | n.d.
Scientists have monitored Lake Tahoe water clarity for decades to understand sediment, nutrients, algae, climate, and watershed influences.
| Tahoe Environmental Research Center | UC Davis | n.d.
Continuous temperature measurements document warming, stratification, mixing, and changing physical conditions within Lake Tahoe.
| Tahoe Environmental Research Center | UC Davis | n.d.
Physical processes such as wind, currents, stratification, mixing, temperature, and inflows determine how materials move through Lake Tahoe.
| U.S. Forest Service | Lake Tahoe Basin Management Unit | n.d.
Forest, watershed, recreation, wildfire, habitat, and erosion management throughout the Tahoe Basin directly influence the ecological condition of Lake Tahoe.
| Tahoe Regional Planning Agency | TRPA | n.d.
Interstate environmental planning seeks to protect Lake Tahoe's clarity, shoreline, forests, transportation system, air quality, habitats, and scenic resources.
| U.S. Environmental Protection Agency | EPA | n.d.
Federal and regional programs target fine sediment and nutrient pollution responsible for reducing Lake Tahoe's renowned water clarity.
| U.S. Geological Survey | California Water Science Center | n.d.
Hydrological and water-quality studies examine streams, groundwater, sediment, nutrients, and watershed processes affecting Lake Tahoe.
| National Park Service | Rocky Mountain National Park | n.d.
High-elevation lakes are cold, nutrient-poor ecosystems strongly influenced by snowmelt, geology, atmospheric deposition, and climate.
| National Park Service | North Cascades National Park | n.d.
Mountain lakes and ponds provide specialized habitats shaped by glaciers, snowmelt, elevation, isolation, and relatively low nutrient availability.
Famous and Exceptional Lakes
| U.S. Geological Survey | USGS | 2025
Lake Powell fundamentally alters sediment, phosphorus, salinity, alkalinity, and other characteristics of Colorado River water passing through the reservoir.
| D. M. Harper | GOV.UK / Freshwater Reviews | 2018
Lake Naivasha illustrates how intensive human use can degrade lake ecosystem services while also encouraging innovative approaches to environmental governance.
| National Park Service | Crater Lake National Park | n.d.
Crater Lake's exceptional depth, volcanic origin, isolation, and unusual clarity make it one of the world's best-known examples of a caldera lake.
| National Park Service | Yellowstone National Park | n.d.
Yellowstone Lake is a large, high-elevation lake shaped by volcanic geology and supports an important native cutthroat trout ecosystem.
| National Park Service | Grand Teton National Park | n.d.
Glacial processes created many of the lakes of the Teton landscape and continue to influence their hydrology and ecology.
| National Park Service | Olympic National Park | n.d.
Lakes and ponds across Olympic National Park range from lowland waters to nutrient-poor mountain lakes with specialized aquatic communities.
| National Park Service | Lake Clark National Park and Preserve | n.d.
Lake Clark and surrounding freshwater systems provide habitat connecting salmon, birds, bears, aquatic organisms, and terrestrial food webs.
| National Park Service | Glacier National Park | n.d.
Mountain lakes in Glacier National Park reflect glacial geology, snowmelt, cold-water ecology, and changing climatic conditions.
| National Park Service | Isle Royale National Park | n.d.
Lake Superior profoundly influences Isle Royale's climate, wildlife, aquatic ecosystems, transportation, and human history.
| National Park Service | Sleeping Bear Dunes National Lakeshore | n.d.
Lake Michigan shapes shoreline ecosystems, dunes, climate, recreational resources, and biological communities throughout the surrounding region.
Human Uses, Management, and the Future of Lakes
| UN-Water | United Nations | n.d.
Healthy freshwater ecosystems supply drinking water, food, biodiversity, flood regulation, cultural values, livelihoods, and other services essential to human societies.
| Convention on Wetlands | Ramsar Convention | n.d.
International wetland conservation includes lakes and their surrounding wetlands because of their ecological, hydrological, and societal importance.
| United Nations Environment Programme | UNEP | n.d.
Sustainable freshwater management requires balancing human water demands with protection of lakes, rivers, wetlands, aquifers, and associated ecosystems.
| World Bank | World Bank | n.d.
Freshwater management is closely connected to drinking water, agriculture, energy, cities, economic development, climate resilience, and ecosystem protection.
| Food and Agriculture Organization | FAO | n.d.
Freshwater ecosystems and their genetic resources support fisheries, aquaculture, food security, livelihoods, and biological diversity.
| U.S. Geological Survey | USGS Water Science School | n.d.
Lakes are components of the global water cycle, receiving water through precipitation, runoff and groundwater and losing it through evaporation and outflow.
| U.S. Geological Survey | USGS Water Science School | n.d.
Surface water stored in lakes and reservoirs is continually exchanged with rivers, groundwater, the atmosphere, and human water systems.
| U.S. Environmental Protection Agency | EPA | n.d.
Runoff from agriculture, urban areas, construction, forestry, and other landscapes is a major source of pollution entering lakes and other surface waters.
