Yr 10 EB Notes 7, 2013
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Coghlan
Earth and Beyond Notes 7
Food Webs
Use the table and diagrams to help you create a food web for this freshwater pond.
Yr 10 EB Notes 7, 2013
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1.
Explain where and how energy enters this food web.
2.
Choose any organism in the web and explain how the abiotic factors may affect
the organism in its environment.
3.
From the web draw one food chain with five trophic levels in it and another with
three levels.
4.
Choose one of your food chains from question 3 and describe what happens to
the amount of energy in the food materials passed along the chain.
5.
A plant nursery close to this freshwater pond sprayed for weeds on a windy day
and some of the herbicide settled on the pond surface. What effect do you think
this may have on the food web? Why?
Food Webs online
1.Try Australian Grasslands
the log in
2.Try Marine Food web
3. Skip
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Ecosystem Resilience
It turned out that in our freshwater pond food web that only 60 % of the pondweed
died and the remaining pondweed recovered quickly. This is an example of
ecosystem resilience.
Ecosystem Resilience is the capacity of an ____________ to respond to a disturbance
by resisting ____________and recovering ____________.
Such disturbances could include:
1. F - - 2. F - - - 3. W - - 4. Insect ____________ explosions
5. H - - - - activities
6. Introduction of exotic plants
7. Introduction of exotic _______________
Biodiversity
There are three types of Biodiversity:
1. Genetic diversity - refers to the variety of ___________ information contained in
all of the individual ___________, ___________and ___________. Genetic diversity
occurs within and between ___________of species as well as between ___________.
2. Species diversity - refers to the ___________of living ___________.
3. Ecosystem diversity - relates to the variety of ___________, biotic communities,
and ___________processes, as well as the tremendous ___________present within
ecosystems in terms of ___________differences and the ___________of ecological
processes.
What is Biodiversity?
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Why is Biodiversity important?
A healthy Biodiversity offers many natural services
Give five examples.
Extinction
View the YouTube presentation and complete the notes as you go
The main factors causing extinction are:
- Habitat ____________
- _____________ crisis
- Pollution
- Growing _____________ population
- Entire ecosystems may face ____________ chain-reaction _____________
Conservation Strategies
The World Wildlife Fund has developed a number of
conservation strategies. Open A Roadmap for a Living Planet by
Ctrl clicking on the panda and then the Roadmap. Move to p.6
for the first Strategy. The page numbers refer to the pdf pages.
1. Saving Biodiversity
- Conserving the Earth’s most outstanding places
e.g. List 5 of the different ecosystems mentioned on p.7
- Conserving some of the Earth’s most important species
e.g. List 5 of the different species mentioned on p.8
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2. Reducing Humanity’s Ecological Footprint
e.g. List 6 of the footprint areas mentioned on p.11
3. Tackling Threats and Drivers
e.g. List 3 of the driver/threat areas mentioned on p.13
4. Pulling it all together
See WWF’s guiding principles on p.14
The
Australian Wildlife Conservancy does
something similar to WWF in Australia. Ctrl click on the bilby.
Their strategies include:
1.
2.
3.
4.
What is the Artesian range project and what is it trying to do?
What are they doing about the feral cat problem?
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National Parks in Australia/Western Australia
Australia has over __________ national parks. Over 28 million
hectares of land is designated as national parkland, accounting
for almost __________ per cent of Australia's land areas. In
addition, a further __________ per cent of Australia is
protected and includes __________ forests, nature parks and __________ reserves.
National parks are usually large areas of land that are protected because they have
__________ landscapes and a __________ number of native plants and animals.
This means that __________ activities such as __________ are prohibited and
human activity is strictly __________ .
Choose a national park in WA that you would
like to visit by Ctrl clicking on the photograph and answer
the following.
Name of park –
Where it is –
How far from Perth is it?
Why did you choose it?
When will you go?