Transcript Primary succession - Brookwood High School

Succession
Chapter 14 – Notesheet III
Section 14-5 – Ecological Succession
Succession
Ecosystems are constantly changing
in response to natural and human
disturbances.
Succession
Ecosystems are constantly changing
in response to natural and human
disturbances.
As an ecosystem changes, older
inhabitants gradually die out
Succession
Ecosystems are constantly changing
in response to natural and human
disturbances.
As an ecosystem changes, older
inhabitants gradually die out
and new organisms move in,
Succession
Ecosystems are constantly changing
in response to natural and human
disturbances.
As an ecosystem changes, older
inhabitants gradually die out
and new organisms move in,
causing further changes in the
community.
Succession
Ecological succession -
Succession
Ecological succession – sequence of
predictable biotic changes that
regenerate a damaged community
or create a community in a
previously uninhabited area
Succession
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Primary succession -
Succession
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Primary succession – on land,
succession that occurs where
Succession

Primary succession – on land,
succession that occurs where
no soil exists.
Succession

Primary succession – on land,
succession that occurs where
no soil exists.
examples-
Succession

Primary succession – on land,
succession that occurs where
no soil exists.
examples- volcanic eruptions create new
land with lava or ash
- exposed bare rock as glaciers
melt
Succession
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Primary succession –
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Pioneer species -
Succession
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Primary succession –

Pioneer species – first species to
populate area of primary succession
Succession
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Primary succession –

Pioneer species – first species to
populate area of primary succession
• Often lichens
• As grow they help break up rocks
Succession

Primary succession –

Pioneer species – first species to
populate area of primary succession
• Often lichens
• As grow they help break up rocks
• When die they add organic material to help for
soil for plants to grow
Succession

Primary succession –
Succession
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Secondary succession –
Succession
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Secondary succession – when
disturbance of some kind changes
an existing community without
removing the soil
Succession

Secondary succession – when
disturbance of some kind changes
an existing community without
removing the soil

Examples -
Succession

Secondary succession – when
disturbance of some kind changes
an existing community without
removing the soil

Examples –
• land is cleared for farming and abandoned
Succession

Secondary succession – when
disturbance of some kind changes
an existing community without
removing the soil

Examples –
• land is cleared for farming and abandoned
• wildfire burns woodlands
Succession

Secondary succession –

Occurs faster than primary succession
because
Succession
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Secondary succession –

Occurs faster than primary succession
because soil is already present
Succession

Secondary succession –