Small Changes in Ecosystems
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Transcript of Small Changes in Ecosystems
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FEATURES OF ECOSYSTEMS
SMALL SCALE EXAMPLES
WHAT HAPPENS IF THEY ARE CHANGED?
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Ecosystems food chains
Starter: Can you
think of a five levelfood chain?
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Key terms in Trophic levels
Producer(plants)
Primary consumer(herbivores)
Secondary consumer(carnivores or omnivores)
Tertiary consumer(top/apex predator = carnivores)
Decomposer(fungi and bacteria = recyclers)
NOTE: When you combine the concept oftrophic
levels, it becomes challenging, depending on how
many consumers are in the chain/web.
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Do you eat the same thing every day? Didnt think so.
Food chains are in fact, more often than not, actually not
linearthey are more like webs
Ecosystem Food Web for a deciduous forest
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Deciduous forest food web -
Sort it out!!! Cut up your sheet and set it out across a double
page in your exercise book to show a food web.
Follow the remaining instructions at the bottom
of the sheet for labels and information.
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What if ecosystemsare experiencechanged?
Are there short termeffects?
Are there long termeffects?
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The impact of change on an
ecosystem The diversity and relative numbers of the
components of an ecosystem can change over
time.
This can be caused by factors such asenvironmental change (e.g. flood, fire,
drought) or human-induced change (e.g.
drainage, reclamation, fish stocking). Once a change has occurred it is rarely
isolated and often has an impact on other
parts of the ecosystem.
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Ecosystem interdependence
Interdependence is a relationship in which
each member is mutually dependent on
the others.
Describe and
explain the
interdependent
relationshipshown here..
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Freshwater pond ecosystem (small scale)
- the impact of change
What if the following happened?
1.Introduction of another predatory fish.
2. Removal of Lily pads. 3. The pond is dredged to increase its depth.
4. Pollution incident kills Great Diving Beetles.
In groups, describe and explain
what the consequences would be
up and down the food web
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What would adding this species do?
What category is it?
What Trophic level is it?
What would happen tothe ecosystem?
Short term
Long term
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What would adding this plant do?
What category is it?
What Trophic level is it?
What would happen tothe ecosystem?
Short term
Long term
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Homework
EITHER:
OR:
OR:
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What would adding this species do?
What category is it?
What Trophic level is it?
What would happen tothe ecosystem?
Short term
Long term
This is a Crane. They are being reintroduced into wetlands in Somerset
after being hunted to extinction in the past. H/W = research this!
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What would adding this species do?
What category is it?
What Trophic level is it?
What would happen tothe ecosystem?
Short term
Long term
This is a Beaver ! They have been reintroduced into river systems in Devon
after being hunted to extinction in the past. H/W = research this!
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What would adding this species do?
What category is it?
What Trophic level is it?
What would happen tothe ecosystem?
Short term
Long term
This is a Burmese Python ! They have been introduced into the everglades
in Florida after Hurricane Andrew (1992) destroyed a reptile centre. H/W = research this!