Download Ecological Succession College Biology Mr. Lee Room 320

Biotic & Abiotic Factors
College Biology
Facilitator: Mr. Lee
Room 320
Objectives
• Identify Biotic Factors of an ecosystem
• Identify Abiotic Factors of an ecosystem
• Describe the differences between Primary and
Secondary Succession
Biotic and Abiotic
Factors
• Ecosystems are influenced by a combination of
biological and physical factors
• Biotic factors are biological influences on organisms
– These are all the living organisms that each
organism interacts with
– Examples are: trees, birds, and mushrooms
Biotic and Abiotic
Factors…
• Abiotic factors are physical, or nonliving factors that
shape ecosystems
– Examples are the climate, wind, soil type, and
sunlight
• Habitat- is the area where an organism lives
Ecological Succession
• Ecosystems are constantly changing in response to
natural and human disturbances
• As older inhabitants die out new organism move in,
changing the community
• Ecological succession is a series predictable change
that happens in a community over a period of time
Primary Succession
• Succession that occurs
where no soil exist
• Happens on surfaces
formed as volcanoes make
new islands or cover the
land with volcanic rock
• Can occur on bare rock left
exposed by glaciers
Primary Succession
Primary Succession…
• Pioneer species are the first
species to populate the area
– Lichens- is made up of a
fungus and an alga
– The lichens help to break
down the rock
– As they die they add
organic material to help
make soil
Lichen You
Secondary Succession
• Happens after a natural event (like
a fire), or by human activities
• When the disturbance is over,
community interactions tend to
restore the ecosystem back to its
original condition
Review
• Identify Biotic Factors
of an ecosystem:
• Biotic factors are all the living
organisms within an ecosystem
• Identify Abiotic Factors
of an ecosystem:
• Abiotic factors are the physical,
nonliving factors that shape an
ecosystem
• Describe the
differences between
Primary and Secondary
Succession:
• Primary Succession occurs where no
soil exist
• Secondary Succession happens after a
natural event (like a fire), or by human
activities
Learn Long
Live Long