Freshwater ecosystems are a subset of aquatic ecosystems on the planet. Freshwater ecosystems are made up of water on land that is constantly cycling and has a low salt content (always less than 5 ppt). Lakes, ponds, rivers, streams, springs, bogs, and wetlands are among them. This article will explain to you about Freshwater ecosystems which will be helpful in preparing the Environment syllabus for the UPSC Civil service exam.

Freshwater Ecosystem- Concept

• Freshwater ecosystems are interactive systems in which biotic species, their growth and adaptability, as well as biological productivity, nutrient cycling, and energy flows among inland aquatic microbial, plant, and animal groups, are interwoven with their surroundings.
• Temperature, light penetration, nutrients, and vegetation are all criteria that can be used to classify freshwater ecosystems.
• They differ from marine habitats, which have a higher salt content.
• Freshwater environments are home to 41% of all known fish species.

Freshwater Ecosystem - Climate

• The freshwater biome occupies around 20% of the Earth's surface area and contains 0.8 percent of all water.
• Summer temperatures range from 65 to 75 degrees Fahrenheit, while winter temperatures range from 35 to 45 degrees Fahrenheit.
• A variety of factors influence the climate of the freshwater biome, including location, season, and water depth.
• As the water gets deeper, the temperature drops on average.

Freshwater Ecosystem - Types

Lentic Ecosystem

• A lentic ecosystem, often known as a lacustrine ecosystem, includes all ecosystems with static or still water.
• In other words, they contain both biotic (living) and abiotic (non-living) physical and chemical interactions.
• Lakes and ponds are among the most common examples of the Lentic Ecosystem.
• Algae, crabs, shrimp, and amphibians like frogs and salamanders also live in these habitats.
• From a small, transient rainwater puddle a few inches deep to Lake Baikal, which has a maximum depth of 1642 meters, lentic systems are diverse.
• It is also called the still water ecosystem.

Lotic Ecosystem

• These primarily relate to fast-moving water bodies that run in one direction, such as rivers and streams.
• Furthermore, these settings support a diverse range of organisms, including beetles, mayflies, stoneflies, and a variety of fish species, including trout, eel, and minnow.
• It is also called the riverine ecosystem.
• A lotic ecosystem's water must have air gasses, turbidity, longitudinal temperature gradation, and materials dissolved in it from source to mouth.
• Rapids and pools are the two main zones of lotic ecosystems.
• Rapids are locations where the water moves quickly enough to maintain the bottom free of debris, whereas pools are deeper areas where the currents are slower and silt accumulates.

Freshwater Ecosystem - Flora

• The animals and plants thrive well in the freshwater because the water is free of the harsh salt present in other areas.
• The freshwater biome is largely a home to grass and sedge.
• Trees are rare in these locations, however they are occasionally seen.
• Plants occurring in freshwater biomes are frequently unrecognizable to most people.
• Some of the other plants that can be found in the freshwater biome are Mangroves, Spike Rush, Water Lily, Cattail, Bull Rush and Pickerel Weed.
• Freshwater biomes are home to a large number of cyanobacteria.

Freshwater Ecosystem - Fauna

• The freshwater ecosystem benefits humans as well.
• Snakes of various types can be found in abundance in lakes, rivers, and marshes, as well as the surrounding environments.
• Water moccasins are one of the most frequent snake species in the region.
• Alligators can be found in some locations of the freshwater biome, but not all of them.
• Animals that live in the freshwater biome can be found both in the water and on land.
• The animals that live on land are mainly reliant on lakes and streams for their water.
• The size and type of fish depends on the location and time of year. Fish such as bass, catfish, and tilapia can be found in the vicinity.
• Over 1,200 amphibian species, 700 fish species, and a diversity of invertebrates live in the freshwater biome.

Freshwater Ecosystem - Significance

• Freshwater is crucial for the survival of our planet. People and wildlife both require fresh water.
• They store and purify water that is essential for humans and wildlife.
• Water is needed for drinking, growing crops, industry, electricity, and transportation in healthy freshwater ecosystems.
• They also aid with the prevention of erosion, trash disposal, and natural flood protection.
• Mismanagement of freshwater settings has resulted in pollution, river drying, and habitat destruction.

Freshwater Ecosystem - Threats

• According to the World Wide Fund for Nature's Living Planet Index, between 1970 and 2014, freshwater vertebrate populations declined by 83%
• Overexploitation, water pollution, flow alteration, habitat destruction or degradation, and invasion by foreign species are five broad threats to freshwater biodiversity.
• Sedimentation, stream fragmentation, chemical and biological contaminants, dams, and invasive species are all factors in recent extinction patterns.
• Acidification, eutrophication, copper, and pesticide pollution are all common chemical pressures on freshwater ecosystem health.
• Climate change is putting even more stress on these ecosystems, with ocean temperatures already rising by up to 1°C and considerable reductions in ice cover causing ecosystem stress.

Conclusion

Freshwater ecosystems link rivers to oceans, land to water, and people to the resources they require to survive. To reap the full range of benefits that nature has to offer, freshwater and terrestrial conservation must work together. This will necessitate a strong policy that understands the interconnectedness of terrestrial and freshwater systems and treats them equally.