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Biology – Ecosystems
Moses Pang
Producers & Their Roles
Producers are biotic organisms that produce its own food
...
This is possible because they have a certain
compound called chlorophyll
...
Interactions in Ecosystems
Interactions in ecosystems happen when 2+ organisms engage, or interact, in a positive
and/or negative way
...
A negative interaction happens when, for example, a
snake eats a frog
...
Population vs Community
Populations
A population is the amount of a group of individuals that belong to the same species
...
Communities
Communities are different populations living together
...
g
...
), E
...
Consumers are living organisms that consume, eat, or absorb other organisms to survive
...
g
...
Bacteria are
microscopic organisms that decompose
...
C
...
C
...
C
...
When a P
...
eats a
producer, it receives 10% of that energy (100J)
...
C
...
C
...
When a T
...
eats a S
...
, it receives 10% of the S
...
’s energy, 1J
...
Decomposers
are the engine/catalyst of the cycle
...
A consumer eats the producer (the plant)
...
Decomposers and scavengers consume & break down the consumer
...
Interactions & Changes in the Ecosystem
An ecosystem is an environment that provides a habitat for nature
...
g
...
Erosion is when wind or rain shave the surface
of rocks and/or land
...
A drought is a lack
of rain
...
Introduced species
are new species in said environment
...
Sustainability
Sustainability is the ability for an environment to sustain itself (to keep on surviving or
function for a long time)
...
There are 3 types
...
g
...
Primary succession is
when we create a community where no community existed before (e
...
Secondary succession occurs when the land has been
destroyed by natural disasters or humans (e
...
barren land after a forest fire)
...
Environmental Impacts of Humans
There are many environmental impacts of humans, including drilling oil, cutting trees,
burning things (in general), factories, emission (driving cars), waste (littering), and agriculture
(fishing, hunting, etc
...
3) Habitat – animal home destruction (affects food chains & sources)
Recycling vs Waste
Definitions
Recycling: turning waste into a new product
Disposal: usually we either drop in a landfill or burn it (lots of emissions)
Landfills: takes a long time to biodegrade; animals and plants are affected; toxic waste
-
Recycling is very expensive & sometimes pollutes more
Technology has improved & recycling is becoming more favorable
Recycling Responsibility
-
Environmental
Financial
Sustainable Human Resources
-
Paper – take old paper, shred and mix with a solution to turn into a pulp that is pressed,
squished, and dried
Trees – we allocate a percentage (usually 10%) of a forest to cut
1%
1%
1%
1%
1%
1%
1%
1%
90%
Next year
Cut & replant
Figure 1