The document defines an ecosystem as an area where a community of organisms interacts with each other and their non-living environment. An ecosystem consists of biotic components like producers, consumers, and decomposers, as well as abiotic components such as sunlight, water, and soil. Energy enters ecosystems from sunlight and is transferred between trophic levels through food chains and food webs, which connect all the organisms in an ecosystem. As energy moves up the food chain, less is available at each higher trophic level, as demonstrated by ecological pyramids.
2. Some Definitions
Ecosystem: Defined area in which a community lives with
interactions taking place among the organisms between
the community and its non-living physical environment.
An ecosystem is formed by the interactions between all
living and non-living things
Ecosystem is the basic functional unit of ecology in which
include both living and non-living things
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3. This term was introduced by Ernst
Haeckl in 1869.
The word ecosystem was coined by
Tansley, A.G. (1935).
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4. What is an ecosystem?
Eco= Environment
System = Regularly interacting and interdependent
components forming a unified whole
Ecosystem = an ecological system;
= a community and its physical environment
treated together as a functional system
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5. Components of an Ecosystem
ABIOTIC
COMPONENTS
Sunlight
Temperature
Precipitation
Water or moisture
Soil or water chemistry
etc.
BIOTIC
COMPONENTS
Primary producers
Herbivores
Carnivores
Omnivores
Detritivores
etc.
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7. TYPES OF AN ECOSYSTEM
• Natural
– Terrestrial ecosystem
– Aquatic ecosystem
• Lentic, the ecosystem of a lake, pond or swamp.
• Lotic, the ecosystem of a river, stream or spring.
• Artificial, ecosystems created by humans.
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8. Terrestrial ecosystem
A terrestrial ecosystem is an ecosystem found only on a landform.
Four primary terrestrial ecosystems exist: tundra, taiga, temperate
deciduous forest, and grassland.
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9. Aquatic Ecosystem
• The two main types of aquatic ecosystems
are marine ecosystems and freshwater
ecosystems.
• Marine ecosystems cover approximately 71%
of the Earth's surface and contain
approximately 97% of the planet's water.
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11. • Freshwater ecosystems cover 0.80% of the
Earth's surface and inhabit 0.009% of its total
water. They generate nearly 3% of its net
primary production.
• Lentic: slow-moving water,
including pools, ponds, and lakes.
• Lotic: rapidly-moving water, for
example streams and rivers.
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15. Trophic level: All the organisms that are
the same number of food-chain steps from
the primary source of energy
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16. • The trophic level interaction involves three
concepts namely
• Food Chain
• Food Web
• Ecological Pyramids
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17. Food Chains
• The producers, consumers, and decomposers
of each ecosystem make up a food chain.
• There are many food chains in an ecosystem.
• Food chains show where energy is transferred
and not who eats whom.
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19. Example of a Food Chain
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20. Food Webs
• All the food chains in an area make up the food web of the area.
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21. Food web of a hot spring
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22. Food web of the harp seal.
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23. Trophic Levels Found on an Energy
Pyramid
• The greatest amount of energy is found at the base of the
pyramid.
• The least amount of energy is found at top of the pyramid.
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24. Summary
• Ecosystems are made up of abiotic (non-living,
environmental) and biotic components, and these
basic components are important to nearly all types
of ecosystems.
• Energy is continually input into an ecosystem in
the form of light energy, and some energy is lost
with each transfer to a higher trophic level.
• Energy is moved through an ecosystem via a food
web, which is made up of interlocking food
chains.
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25. References
• Odum, E.P.(1971), Fundamental of Ecology, Principles
and concept pertaining to the ecosystem. pp 8-33.
• Odum, E.P.(1983), Basic ecology, The ecosystem, pp 1382.
• Shrivastava, C.B.L. (1999), A Text Book of Fisheries
Science and Inland Fisheries, Ecology of Aquatic
Ecosystem, pp 160-206.
• Jhingran, V.G. (1991), Fish and Fisheries of India, Fish
culture in fresh water pond, Ecology, pp 273-328
• http://www.scribd.com/doc/14179924/13-Structureand-Function-of-Ecosystem
• http://www.globalchange.umich.edu/globalchange1/c
urrent/lectures/kling/ecosystem/ecosystem.html
• www.wikipedia.org/wiki/Ecosystem
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