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AQUATIC ECOSYSTEM by Pranzly.ppt

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AQUATIC ECOSYSTEM by Pranzly.ppt

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Aquatic ecosystem
Definition
∆Types
∆Freshwaters
=Lentic (still water)
=Lotic (running water)
∆Marine ecosystem
=Ocean
=Coastal
∆Freshwater ecosystems
∆Pond and lake ecosystem
∆Stratification
=Littoral
=Limnetic
=Pro-fundal
∆components
Producers
Consumers
Decomposers
∆threats to ecosystem
∆solutions

Aquatic ecosystem
Definition
∆Types
∆Freshwaters
=Lentic (still water)
=Lotic (running water)
∆Marine ecosystem
=Ocean
=Coastal
∆Freshwater ecosystems
∆Pond and lake ecosystem
∆Stratification
=Littoral
=Limnetic
=Pro-fundal
∆components
Producers
Consumers
Decomposers
∆threats to ecosystem
∆solutions

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AQUATIC ECOSYSTEM by Pranzly.ppt

  1. 1. AQUATIC ECOSYSTEM PRESENTED BY PRANZLY
  2. 2. DEFINITION An aquatic ecosystem includes a group of interacting organisms which are dependent on one another and their water environment for nutrients and shelter. Examples of aquatic ecosystem include oceans, lakes and rivers. The word 'aquatic' is derived from the Latin word 'aqua', which means water. So, in a water-based setting, an aquatic ecosystem is a community of species that live together, interact, and to some extent rely on one another. Habitat is a part of an ecosystem. The climate, plants, and animals are the identities of a habitat
  3. 3. TYPES AQUATIC OR WATER ECOSYSTEM. FRESH WATER ECOSYSTEM LENTIC POND LAKE LOTIC STREAM RIVER WETLANDS MARINE ECOSYSTEM OCEAN COASTAL
  4. 4. FRESH WATER ECOSYSTEM Covers nearly 0.8 per cent. LENTIC ECOSYSTEM Include all ecosystems with static or still water Lakes and ponds are examples. Algae, crabs, shrimp & amphibians live in these habitat Also called lacustrine ecosystem or stil water ecosystem LOTIC ECOSYSTEM Rapidly flowing waters that move in a unidirectional way Includes river and streams Harbors insects such as beetles, mayflies, also called riverine ecosystem
  5. 5. POND AND LAKE ECOSYSTEM On the basis of water depth and types of vegetation and animals there may be three zones in a lake or pond littoral, limnetic and pro-fundal. The Littoral Zone is the shallow Water region which is Usually occupied by rooted plants. The limnetic-zone ranges from the shallow to the depth of effective light penetration and associated organisms are small crustaceans, rotifers, insects, and their larvae and algae. The pro-fundal zone is the deep water parts where there is no effective light penetration. The associated organisms are snails, mussels, crabs and worms
  6. 6. COMPONENTS ABIOTIC COMPONENTS CONSISTS OF WATER, DISSOLVED MINERALS, OXYGEN, AND CARBON DIOXIDE BIOTIC COMPONENTS PRODUCERS CONSUMERS DECOMPOSERS AND TRANSFORMERS.
  7. 7. BIOTIC COMPONENTS PRODUCERS Main producers are algae and other aquatic plants, such as azolla, hydrilla, pistia, wolffia. Are either floating or suspended or rooted at the bottom. The green plants convert the radiant energy into chemical energy through photosynthesis. The chemical energy stored in the form of food is utilized by all the organisms. Oxygen evolved by producers in photosynthesis is utilized by all the living organisms in respiration. CONSUMERS the primary consumers are tadpole larvae of frogs, fishes and other aquatic animals which consume green plants and algae as their food. These herbivorous aquatic animals are the food of secondary consumers. Frogs, big fishes, water snakes, crabs are secondary consumers. In the pond, besides the secondary consumers, there are consumers of highest order, such as water-birds, turtles DECOMPOSERS AND TRANSFORMERS When aquatic plants and animals die, a large number of bacteria and fungi attack their dead bodies and convert the complex organic substances into simpler inorganic compounds and elements. These micro-organisms are called decomposers chemical elements liberated by decomposers are again utilized by green plants in their nutrition
  8. 8. TERTIARY CONSUMER 10 kcal SECONDARY CONSUMER 100 Kcal PRIMARY CONSUMERS 1000 Kcal PRODUCERS 10,000 kcal Decr ea sing rate of energy flow PYRAMID OF ENERGY Out of the total energy available at a particular trophic level, only 10% is passed on to the next trophic level. making it impossible for energy to flow in reverse direction
  9. 9. • EPILIMNION - The uppermost and warmest layer (also called the mixed layer) of a lake that experiences density stratification induced by seasonal warming at the lake surface. • METALIMNION - A layer of transitional density and temperature that connects the epilimnion to the hypolimnion. • HYPOLIMNION - The most dense, deepest, and coolest layer of a thermally stratified lake. does not support photosynthesis, because it lacks solar irradiance, and in many cases shows partial or complete depletion of dissolved oxygen. STRATIFICATION OF LAKE AND POND ECOSYSTEM
  10. 10. STRATIFICATION OF LAKE AND POND ECOSYSTEM • APHOTIC - Without light, generally interpreted limno-logically as receiving less than 1% of solar irradiance reaching a lake surface. • EUPHOTIC - That portion of a lake receiving sufficient solar irradiance to support photosynthesis (typically more than 1% of full solar irradiance). • LITTORAL - Near the shore of a waterbody, where irra-diance reaching the bottom is above 1% of solar irradiance at the water surface. • PELAGIC - Beyond the littoral zone of a lake. • BENTHIC - The zone of a lake extending a few centimeters above and below the bottom of the lake.
  11. 11. THREATS TO ECOSYSTEM Stress on an aquatic ecosystem can be a result of physical, chemical or biological alterations to the environment. THREATS TO ECOSYSTEM PHYSICAL ALTERATIONS include changes in water temperature, water flow and light availability. CHEMICAL ALTERATIONS include changes in the loading rates of biostimulatory nutrients, oxygen-consuming materials, and toxins. BIOLOGICAL ALTERATIONS include over-harvesting of commercial species and the introduction of exotic species
  12. 12. • Educating about water-related issues • Environmental education centres located adjacent to wetlands, rivers & other natural features enhance public awareness of the feature. • Development of recreational zones by developing gardens, parks and introduction of water sports. • Construction of a boundary wall after proper survey to prevent encroachment. • Reducing the pollution of the lake and improving the water quality by disiltation, Bio-Remediation, and through various measures such as flap gates, construction of dhobi ghats and toilets, watershed management techniques, etc. • Building embankments, walkways and pathways to the water bodies Planting trees, and creating gardens. • Installing docks, deploying boats and canoes. • Allocating funds for annual maintenance. SOLUTIONS

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