The biotic elements that comprise an ecosystem fall into one of several trophic levels. The trophic level of an organism is its position in a food chain, the sequence of consumption and energy transfer through the environment.

1. Structural
Components of an
Ecosystem (BIOTIC)
By Prof. Liwayway Memije-Cruz

2. Web of Life

3. The scientific study
of the distribution
and abundance of
living organisms
and how the
distribution and
abundance are
affected by
interactions between
the organisms and
their environment.
Ecology

4. Definitions of Ecology:
the study of organisms at home
the study of the relationships of
organisms or groups of organisms to
their environment
the science of interrelationships between
living organisms to their environment
totality of man to their environment

5. Photosynthesis

6. Photosynthesis
The trapping of solar energy and its conversion to chemical
energy, which is used in manufacturing of food molecules. from
carbon dioxide and water.

9. Respiration – the metabolic assimilation of oxygen with production
of carbon dioxide and water, release of energy and breaking down of
organic substances

10. Ecosystem
includes all of the
living things: plants,
animals and organisms
in a given area,
interacting with each
other, and also with
their non-living
environments like
weather, earth, sun,
soil, climate and
atmosphere.

11. Trophic Level
The steps involved
in the flow of
energy through an
ecosystem.
the position that an
organism occupies
in a food chain -
what it eats, and
what eats it.

12. Producers or autotrophs
the organisms which
utilize energy from the
sun and nutrients from the
abiotic environment to
perform photosynthesis
and grow.
generally the green plants
able to produce or build
its own complex organic
molecule from simple
inorganic substance in the
environment.

13. Photosynthetic autotrophs
are organisms able to build all of the organic molecules it
requires using carbon dioxide as the carbon source and
sunlight as the energy source. Examples: bacteria and plants

14. Chemosynthetic autotrophs
few kinds of bacteria
able to build all the
organic molecules it
requires carbon
dioxide as the carbon
source and certain
inorganic substances
(sulfur) as the energy
source. Examples:
sulfur bacteria

15. Consumers or heterotrophs
Organisms that feed on other organisms
Herbivores - animals that get its energy from eating
plants, and only plants.
Carnivores - animals that get food from killing and
eating other animals.
Omnivores - animals that eat either other animals or
plants. Some are scavengers and eat dead matter.
Decomposers and Detritivores are animals that
utilize energy from wastes or dead organisms.

16. Food Chain
The passage of energy from one tropic level to the next
as a result of one organism consuming another

17. Food web
A network of interlinked food chains composed of
primary producers and decomposers